3dpasswordreport Slideshare 121108034209 Phpapp01

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    3-D PASSWORD

    BY

    ABHISHEK PANDEY (1209141001)

    DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING

    JSS ACADEMY OF TECHNICAL EDUCATION, C-20/1 SECTOR-62, NOIDA

      2014-2015

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    Abstract

    Cu!"# $u#%!"#'$#(" )*)#!+) )u! (+ +$"* !$."!))!) T!#u$ $))(3)

    $! '(++("* u)!3 %(!!, u)!) 3( "(# (( #%! !u!+!"#) U)!) #!"3 #(

    '%(()! +!$""7u (3) (+ 3'#("$!), %'% +$.! #!#u$ $))(3) !$)* #(

     8!$. $"3 u"!$8! #( 3'#("$* ( 8u#! ('! $##$'.) M$"* $$$8! 7$%'$

     $))(3) %$! $ $))(3 )$'! #%$# ) !)) #%$" ( !u$ #( #%! #!#u$ $))(3

    )$'! S+$# '$3) ( #(.!") '$" 8! )#(!" M$"* 8(+!#' $u#%!"#'$#(") %$!

     8!!" (()!3 %(!!, u)!) #!"3 #( !))# u)"7 8(+!#') 8!'$u)! ( #%! 

    "#u)!"!)) $"3 #%! !!'# (" #%! $'* M(!(!, 8(+!#') '$""(# 8!

    !(.!3 I" #%) $!, ! !)!"# $"3 !$u$#! (u '("#8u#(", !, #%! 9-D

     $))(3 T%! 9-D $))(3 ) $ +u#$'#( $u#%!"#'$#(" )'%!+! T( 8!

    $u#%!"#'$#!3, ! !)!"# $ 9-D #u$ !"("+!"# %!! #%! u)! "$7$#!) $"3

    "#!$'#) #% $(u) (8:!'#) T%! )!u!"'! ( $'#(") $"3 "#!$'#(") #($3 #%!

    (8:!'#) ")3! #%! 9-D !"("+!"# '(")#u'#) #%! u)!;) 9-D $))(3 T%! 9-D

     $))(3 '$" '(+8"! +()# !)#"7 $u#%!"#'$#(" )'%!+!) )u'% $) #!#u$

     $))(3), 7$%'$ $))(3), $"3 $(u) #*!) ( 8(+!#') "#( $ 9-D #u$

    !"("+!"# T%! 3!)7" ( #%! 9-D #u$ !"("+!"# $"3 #%! #*! ( (8:!'#)

    )!!'#!3 3!#!+"! #%! 9-D $))(3 .!* )$'!

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    Ack!"#$%&$'$t

    A) I #! #%) $'."(!37!+!"#, I +u)# '$* #%$# #%) ) "(# :u)# $ (+$ $'."(!37!+!"#

     8u# $)( $ )"'!! "(#! ( #%$".) $"3 !7$3 (+ +* )3! I !! $ 3!! )!")! ( 7$##u3! $"3

    $!'#(" ( #%()! %( !! $))('$#!3 #% #%) )!+"$

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    ABE O* +ONENS

     Abstract 

    1 9D $))(3) 1

    11 I"#(3u'#(" 1

    11 R!$#!3

    124 A'$#(") 12

    19 S!'u#* A"$*)) 19

    191 P$))(3 S$'! S?! 14

    192 P$))(3 D)#8u#(" @"(!37! 16

    199 A##$'.) $"3 C(u"#!+!$)u!) 1

    14 E!+!"#$ !)u#) 20

    141 E!+!"#$ B#u$ 9D !"("+!"# 20

    142 U)! S#u3* 21

    2 L#!$#u! R!! 22

    9 C("'u)(" $"3 Fu#u! (.  29

     References 25

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    INROD,+ION

    T%! 3$+$#' "'!$)! ( '(+u#! u)$7! %$) 7!" )! #( +$"* )!'u#* '("'!") O"! +$:( 

    )!'u#* '("'!" ) $u#%!"#'$#(", %'% ) #%! ('!)) ( $3$#"7 %( *(u $! #( %(+ *(u

    '$+!3 #( 8! I" 7!"!$, %u+$" $u#%!"#'$#(" #!'%"u!) '$" 8! '$))!3 $)

    KnowledgeBased -What youKNOW

    Human Authentication

    Token Based

    -What

    techniques you HAVE

    Biometrics -What

    you ARE

     TextualPassword

    GraphicalPassword

    ATM cards

    Keys

    I cards

    !i"#erpri"ts$Pal%pri"ts

    Ha"d#eo%etry

    !ace$ Iris$Voice$ Reti"areco#"itio"

     Figure 1 – Human Authentication Techniques - Classification

    $t.a# /ass"!r%s

    R!'$-8$)!3 #!'%"u!) !u! #%! u)! #( !!$# ( !(3u'! $ )!'!# #%$# #%! u)! '!$#!3 8!(!

    R!'(7"#(" 8$)!3 #!'%"u!) !u! #%! u)! #( 3!"#* $"3 !'(7"?! #%! )!'!#, ( $# ( #, #%$#

    #%! u)! )!!'#!3 8!(! O"! ( #%! +()# '(++(" !'$-8$)!3 $u#%!"#'$#(" )'%!+!) u)!3 " #%!

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    '(+u#! (3 ) #!#u$ $))(3) O"! +$:( 3$8$'. ( #%! #!#u$ $))(3 ) #) #(

    '("'#"7 !u!+!"#) #%! )!!'#(" ( $))(3) #%$# $! !$)* #( !+!+8! $"3, $# #%! )$+! #+!,

    $! %$3 #( 7u!))

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    @!"2

     '(!'#!3 #%! $))(3) ( "!$* 15 000 $''(u"#) #%$# %$3 $%$"u+!'$ $))(3), $"3

    %! !$'%!3 #%! (("7 (8)!$#(" 25 ( #%! $))(3) !! 7u!))!3 8* u)"7 $ )+$ *!# !-

    (+!3 3'#("$* ( 9 106 (3) Fu#%!+(!, 21 ( #%! $))(3) !! 7u!))!3 " #%! )#

    !!. $"3 96= $))(3) !! 7u!))!3 #%" #%! )# 15 +" @!"

    2

     )#$#!3 #%$# 8* ((."7 $##%!)! !)u#) " $ )*)#!+ #% $8(u# 50 $''(u"#), #%! )# $''(u"# '$" 8! 7u!))!3 " 2 +" $"3 515

    $''(u"#) '$" 8! 7u!))!3 " #%! )# 3$* @!"2

     )%(!3 #%$# !!" #%(u7% #%! u #!#u$ $))(3

    )$'! ( !7%#-'%$$'#! $))(3) '("))#"7 ( !##!) $"3 "u+8!) ) $+()# 2 1014

     ())8!

     $))(3), # ) !$)* #( '$'. 25 ( #%! $))(3) 8* u)"7 ("* $ )+$ )u8)!# ( #%! u $))(3

    )$'! I# ) +(#$"# #( "(#! #%$# @!";) !!+!"# $) " 1>>0 %!" #%! ('!))"7 '$$8#!),

    +!+(*, "!#(."7, $"3 (#%! !)(u'!) !! !* +#!3 '(+$!3 #( #(3$*;) #!'%"((7*

    ra/ca# /ass"!r%s

    B$(u) 7$%'$ $))(3 )'%!+!) %$! 8!!" (()!3 G$%'$ $))(3) $! 8$)!3 (" #%! 3!$

    #%$# u)!) '$" !'$ $"3 !'(7"?! '#u!) 8!##! #%$" (3) H(!!, )(+! ( #%! 7$%'$

     $))(3 )'%!+!) !u! $ ("7 #+! #( 8! !(+!3 M(!(!, +()# ( #%! 7$%'$ $))(3)

    '$" 8! !$)* (8)!!3 ( !'(3!3 %! #%! !7#+$#! u)! ) !(+"7 #%! 7$%'$ $))(3

    #%u), # ) u"!$8! #( )%(u3! )u"7 $##$'.) Cu!"#*, +()# 7$%'$ $))(3) $! )# " #%! 

    !)!$'% %$)! $"3 !u! +(! !"%$"'!+!"#) $"3 u)$8#* )#u3!) #( 3!(* #%!+ " #%! +$.!#

    B!'$trcs

    M$"* 8(+!#' )'%!+!) %$! 8!!" (()!3 "7!"#), $+"#), %$"3 7!(+!#*, $'!

    !'(7"#(", ('! !'(7"#(", ) !'(7"#(", $"3 !#"$ !'(7"#(" $! $ 3!!"# 8(+!#'

    )'%!+!) E$'% 8(+!#' !'(7"#(" )'%!+! %$) #) $3$"#$7!) $"3 3)$3$"#$7!) 8$)!3 (" )!!$

    $'#() )u'% $) '("))#!"'*, u"u!"!)), $"3 $''!#$8#* O"! ( #%! +$" 3$8$'.) ( $*"7

     8(+!#') ) #) "#u)!"!)) u(" $ u)!;) !)("$ '%$$'#!)#' M(!(!, !#"$ 8(+!#'$

    !'(7"#(" )'%!+!) !u! #%! u)! #( "7* )u8:!'# #%! !*!) #( $ (-"#!")#* "$!3 7%#

    I" $33#(", +()# 8(+!#' )*)#!+) !u! $ )!'$ )'$"""7 3!'! #( $u#%!"#'$#! u)!), %'% )

    "(# $'$8! ( !+(#! $"3 I"#!"!# u)!)

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      +HAPER - 1

    3D Pass"!r%s

    T%! 9-D $))(3 ) $ +u#$'#( $u#%!"#'$#(" )'%!+! I# '$" '(+8"! $ !)#"7 $u#%!"#'$#(" )'%!+!)

    "#( $ )"7! 9-D #u$ !"("+!"# T%) 9-D #u$ !"("+!"# '("#$") )!!$ (8:!'#) ( #!+) #%

    %'% #%! u)! '$" "#!$'# T%! #*! ( "#!$'#(" $!) (+ ("! #!+ #( $"(#%! T%! 9-D $))(3 )'(")#u'#!3 8* (8)!"7 #%! $'#(") $"3 "#!$'#(") ( #%! u)! $"3 8* (8)!"7 #%! )!u!"'!) ( )u'%

    $'#(")

    I# ) #%! u)!;) '%('! #( )!!'# %'% #*! ( $u#%!"#'$#(" #!'%"u!) 8! $# ( #%! 9-D $))(3 T%)

    ) $'%!!3 #%(u7% "#!$'#"7 ("* #% #%! (8:!'#) #%$# $'u! "(+$#(" #%$# #%! u)! ) '(+(#$8! "

     (3"7 $"3 7"("7 #%! (8:!'#) #%$# !u!)# "(+$#(" #%$# #%! u)! !!) "(# #( (3! F( !$+!,

    $" #!+ !u!)#) $" ) )'$" $"3 #%! u)! ) "(# '(+(#$8! " (3"7 )u'% "(+$#(", #%! u)! )+*

    $(3) "#!$'#"7 #% #%$# #!+ M(!(!, 7"7 #%! u)! #%! !!3(+ ( '%('! $) #( %$# #*! (

    $u#%!"#'$#(" )'%!+!) 8! $# ( #%! 9-D $))(3 $"3 7!" #%! $7! "u+8! ( (8:!'#) $"3 #!+) "

    #%! !"("+!"#, #%! "u+8! ( ())8! 9-D $))(3) "'!$)! T%u), # 8!'(+!) +u'% +(! 3'u# (

    #%! $##$'.! #( 7u!)) #%! u)!;) 9-D $))(3

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    REAED WORKS

    M$"* 7$%'$ $))(3 )'%!+!) %$! 8!!" (()!36=

    ,1012

    ("3! 6

     "#(3u'!3 #%! )#

    7$%'$ $))(3 )'%!+$ ("3!;) 3!$ ( 7$%'$ $))(3) ) #%$# 8* %$"7 $ !3!#!+"!3

    +$7!, #%! u)! '$" )!!'# ( #(u'% !7(") ( #%! +$7! '$u)"7 #%! )!u!"'! $"3 #%! ('$#(" ( #%!

    #(u'%!) #( '(")#u'# #%! u)!;) 7$%'$ $))(3 A#! ("3! 6

      , #%! "(#(" ( 7$%'$

     $))(3) $) 3!!(!3 M$"* 7$%'$ $))(3 )'%!+!) %$! 8!!" (()!3

    &'( Vu

    Reco#"itio"Pass)aces

    *ased

    Graphical+tory+che%e

    passwords

    Passpoi"t

    Recall *asedraw a+ecret,A+-

     Figure 2 – Graphical Passor!s - Classification

    D%$+:$ $"3 P!7

     (()!3 D:K Bu, %'% ) $ R!'(7"#("-8$)!3 7$%'$ $))(3 )*)#!+

    #%$# $u#%!"#'$#!) U)!) 8* '%(()"7 (#(() $+("7 3!'(* (#(() T%!)! (#(() $! $#

    $"3(+?!3 (#(() E$'% +$7! ) 3!!3 (+ $" =- )!!3 T%!!(!, $" $u#%!"#'$#(" )!! 

    3(!) "(# "!!3 #( )#(! #%! %(! +$7! # )+* "!!3) #( )#(! #%! =- )!!3 A"(#%! !'(7"#("-

     8$)!3 7$%'$ $))(3 ) P$))$'!)=

    P$))$'!) )+* (.) 8* %$"7 #%! u)! )!!'# $

    )u87(u ( . $'!) (+ $ 7(u ( " $'!) F( $u#%!"#'$#(", #%! )*)#!+ )%() + $'!) $"3 ("! ( 

    #%! $'!) 8!("7) #( #%! )u87(u . T%! u)! %$) #( 3( #%! )!!'#(" +$"* #+!) #( '(+!#! #%!

    $u#%!"#'$#(" ('!)) A"(#%! )'%!+! ) #%! S#(* )'%!+!>

    , %'% !u!) #%! )!!'#(" ( 

     '#u!) ( (8:!'#) !(!, '$), ((3), $$"!), )7%#)!!"7, !#' #( (+ $ )#(* "! D$) !# $

    > '("'u3!3 #%$# #%! u)!;) '%('!) " P$))$'!) $"3 " #%! S#(* )'%!+! !)u# " $ $))(3 )$'!

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    #%$# ) $ !)) #%$" #%! #%!(!#'$ !"#(* T%!!(!, # !$3) #( $" ")!'u! $u#%!"#'$#(" )'%!+!

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    T%! 7$%'$ $))(3 )'%!+$ ( ("3!6

      ) '(")3!!3 #( 8! !'$ 8$)!3 )"'! #%! u)! +u)#

    !+!+8! )!!'#(" ('$#(") M(!(!, P$))P("# ) $ !'$-8$)!3 7$%'$ $))(3

    )'%!+$, %!! $ 8$'.7(u"3 '#u! ) !)!"#!3 $"3 #%! u)! ) !! #( )!!'# $"* ("# (" #%! '#u!$) #%! u)!;) $))(3 u)!;) P$))P("# D$ $ S!'!# DAS, %'% ) $ !'$-8$)!3 7$%'$

     $))(3 )'%!+$ $"3 "#(3u'!3 8* J!+*" !# $19

    , ) )+* $ 73 " %'% #%! u)! '!$#!) $

    3$"7 T%! u)!;) 3$"7), %'% '("))# ( )#(.!), $! '(")3!!3 #( 8! #%! u)!;) $))(3 T%!

    )?! $"3 #%! '(+!#* ( #%! 73 $!'# #%! (8$8! $))(3 )$'! L$7! 73 )?!) "'!$)! #%!

    u $))(3 )$'! H(!!, #%!! $! +#$#(") " 73 '(+!#* 3u! #( %u+$" !( I#

     8!'(+!) !* %$3 #( !'$ %!! #%! 3$"7 )#$#!3 $"3 !"3!3 $"3 %!! #%! +33! ("#) !!  

    ! %$! !* $7! 73 )?!)

    O"! +(#$"# #*! ( $u#%!"#'$#(" ) 8$)!3 (" %( *(u $! (, " (#%! (3), 8(+!#')

    (+!#' !'(7"#(" )*)#!+) %$! 8!!" !%$u)#!* )#u3!3 $) $ $* ( $u#%!"#'$#("

    F"7!"#), $+"#), $'! !'(7"#(", ('! !'(7"#(", $"3 ) $"3 !#"$ !'(7"#(" $! $

    3!!"# +!#%(3((7!) ( 8(+!#' !'(7"#(" )*)#!+)

    Hu+$" (!#!) $! u"!$8! #( '%$"7! (+ #+! #( #+! 3u! #( )!!$ !$)(") )u'% $)

    $7"7, )'$"7, $'! +$.!u, '%$"7! ( %$)#*!, $"3 )'."!)) '%$"7! ( ('!

    P!(! #!"3 #( !))# 8(+!#') ( 3!!"# !$)(") S(+! !(! #%". #%$# .!!"7 $ '(*

    ( #%! u)!;) "7!"#) ) "(# $''!#$8! $"3 ) $ #%!$# #( #%! u)!;) $'* I" $33#(",

    )(+! u)!) !))# #%! 3!$ ( $ (-"#!")#* "$!3 7%# ( $"* (#%! ."3 ( 7%# 3!'#!3 $#

    #%! !*!), )u'% $) " !#"$ !'(7"#(" )*)#!+)

    (+!#') '$""(# 8! !(.!3, %'% !$3) #( $ 3!++$ " '$)! #%! u)!;) 3$#$ %$! 8!!"

    (7!3 U".! (#%! $u#%!"#'$#(" )'%!+!) %!! #%! u)! '$" $#! %)/%! #!#u$ $))(3

    " '$)! ( $ )#(!" $))(3 ( !$'! %)/%! #(.!" # %$) 8!!" )#(!" ( (7!3, $ u)!;)

     8(+!#') '$""(# 8! !(.!3

    1012

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    S+HEE

    I" #%) )!'#(", ! !)!"# $ +u#$'#( $u#%!"#'$#(" )'%!+! #%$# '(+8"!) #%! 8!"!#) ( $(u)

    $u#%!"#'$#(" )'%!+!)

    1 T%! "! )'%!+! )%(u3 "(# 8! !#%! !'$ 8$)!3 ( R!'(7"#(" 8$)!3 ("* I")#!$3, #%!

    )'%!+! )%(u3 8! $ '(+8"$#(" ( !'$-, !'(7"#("-, 8(+!#')-, $"3 T(.!"-8$)!3

    $u#%!"#'$#(" )'%!+!)

    2 U)!) (u7%# #( %$! #%! !!3(+ #( )!!'# %!#%! #%! 9-D $))(3 8! )(!* !'$-,

     8(+!#')-, !'(7"#("-, ( #(.!"-8$)!3, ( $ '(+8"$#(" ( #( )'%!+!) ( +(! T%)

    !!3(+ ( )!!'#(" ) "!'!))$* 8!'$u)! u)!) $! 3!!"# $"3 #%!* %$! 3!!"#

    !u!+!"#) S(+! u)!) 3( "(# .! #( '$* '$3) S(+! u)!) 3( "(# .! #( (3!

     8(+!#'$ 3$#$, $"3 )(+! u)!) %$! (( +!+(!) T%!!(!, #( !")u! %7% u)! 

    $''!#$8#*, #%! u)!;) !!3(+ ( )!!'#(" ) +(#$"#

    9 T%! "! )'%!+! )%(u3 (3! )!'!#) #%$# $! !$)* #( !+!+8! $"3 !* 3'u# ( 

    "#u3!) #( 7u!))

    4 T%! "! )'%!+! )%(u3 (3! )!'!#) #%$# $! "(# !$)* #( #! 3(" (" $! M(!(!,

    #%! )'%!+! )!'!#) )%(u3 8! 3'u# #( )%$! #% (#%!)

    5 T%! "! )'%!+! )%(u3 (3! )!'!#) #%$# '$" 8! !$)* !(.!3 ( '%$"7!3

    $)!3 (" #%! $(!+!"#("!3 !u!+!"#), ! (()! (u '("#8u#(", !, #%! 9-D $))(3

    $u#%!"#'$#(" )'%!+!

    3-D Pass"!r% O$r$"

    T%! 9-D $))(3 ) $ +u#$'#( $u#%!"#'$#(" )'%!+! T%! 9-D $))(3 !)!"#) $ 9-D #u$

    !"("+!"# '("#$""7 $(u) #u$ (8:!'#) T%! u)! "$7$#!) #%(u7% #%) !"("+!"# $"3

    "#!$'#) #% #%! (8:!'#) T%! 9-D $))(3 ) )+* #%! '(+8"$#(" $"3 #%! )!u!"'! ( u)! 

    "#!$'#(") #%$# (''u " #%! 9-D #u$ !"("+!"# T%! 9-D $))(3 '$" '(+8"! !'(7"#("-,

    !'$-, #(.!"-, $"3 8(+!#')-8$)!3 )*)#!+) "#( ("! $u#%!"#'$#(" )'%!+! T%) '$" 8! 3("! 8*

    3!)7""7 $ 9-D #u$ !"("+!"# #%$# '("#$") (8:!'#) #%$# !u!)# "(+$#(" #( 8! !'$!3,

    "(+$#(" #( 8! !'(7"?!3, #(.!") #( 8! !)!"#!3, $"3 8(+!#'$ 3$#$ #( 8! !!3 F( 

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    !$+!, #%! u)! '$" !"#! #%! #u$ !"("+!"# $"3 #*! )(+!#%"7 (" $ '(+u#! #%$# !)#) "

    1, *1, ?1 ()#(", #%!" !"#! $ ((+ #%$# %$) $ "7!"# !'(7"#(" 3!'! #%$# !)#) " $

     ()#(" 2, *2, ?2 $"3 (3! %)/%! "7!"# T%!", #%! u)! '$" 7( #( #%! #u$ 7$$7!, (!"

    #%! '$ 3((, $"3 #u" (" #%! $3( #( $ )!'' '%$""! T%! '(+8"$#(" $"3 #%! )!u!"'! ( #%!

     !(u) $'#(") #($3 #%! )!'' (8:!'#) '(")#u'# #%! u)!;) 9-D $))(3

    B#u$ (8:!'#) '$" 8! $"* (8:!'# #%$# ! !"'(u"#! " !$ ! A"* (8(u) $'#(") $"3 "#!$'#(")

    #($3 #%! !$-! (8:!'#) '$" 8! 3("! " #%! #u$ 9-D !"("+!"# #($3 #%! #u$ (8:!'#)

    M(!(!, $"* u)! "u# )u'% $) )!$."7 " $ )!'' ('$#(" " #%! #u$ 9-D !"("+!"# '$"

     8! '(")3!!3 $) $ $# ( #%! 9-D $))(3

    1 A '(+u#! #% %'% #%! u)! '$" #*!

    2 A "7!"# !$3! #%$# !u!) #%! u)!;) "7!"#

    9 A 8(+!#'$ !'(7"#(" 3!'!

    4 A $! ( $ %#! 8($3 #%$# $ u)! '$" #!, )7", ( D$ ("

    5 A" $u#(+$#!3 #!! +$'%"! ATM #%$# !u!)#) $ #(.!"

    6 A 7%# #%$# '$" 8! )#'%!3 ("/(

    A #!!)(" ( $3( %!! '%$""!) '$" 8! )!!'#!3

    = A )#$! #%$# '$" 8! u"'%!3

    > A '$ #%$# '$" 8! 3!"

    10 A 8((. #%$# '$" 8! +(!3 (+ ("! $'! #( $"(#%!

    11 A"* 7$%'$ $))(3 )'%!+!

    12 A"* !$-! (8:!'#

    19 A"* u'(+"7 $u#%!"#'$#(" )'%!+!

    T%! $'#(" #($3 $" (8:!'# $))u+! $ "7!"# !'(7"#(" 3!'! #%$# !)#) " ('$#(" 1, *1,

    ?1 ) 3!!"# (+ #%! $'#(") #($3 $ )+$ (8:!'# $"(#%! "7!"# !'(7"#(" 3!'! #%$#

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    !)#) " ('$#(" 2, *2, ?2, %!! 1 2, *1 *2, $"3 ?1 ?2 T%!!(!, #( !(+ #%!

    !7#+$#! 9-D $))(3, #%! u)! +u)# (( #%! )$+! )'!"$( !(+!3 8* #%! !7#+$#! u)!

    T%) +!$") "#!$'#"7 #% #%! )$+! (8:!'#) #%$# !)3! $# #%! !$'# ('$#(") $"3 !(+ #%! !$'#

    $'#(") " #%! (! )!u!"'!

    3-D Pass"!r% S$#$ct! a% I/.ts

    L!# u) '(")3! $ 9-D #u$ !"("+!"# )$'! ( )?! G G G T%! 9-D !"("+!"# )$'! )

    !!)!"#!3 8* #%! '((3"$#!) , *, ? 1, , G 1, , G 1, , G T%! (8:!'#) $!

    3)#8u#!3 " #%! 9-D #u$ !"("+!"# #% u"u! , *, ? '((3"$#!)

    '$" "$7$#! "#( #%! 9-D #u$ !"("+!"# $"3 "#!$'# #% #%! (8:!'#) u)"7 $"* "u# 3!'!

    )u'% $) $ +(u)!, .!*8($3, "7!"# )'$""!, ) )'$""!, )#*u), '$3 !$3!, $"3 +'(%("!

    '(")3! #%! )!u!"'! ( #%()! $'#(") $"3 "#!$'#(") u)"7 #%! !(u) "u# 3!'!) $) #%! u)!;)

    9-D $))(3 F( !$+!, '(")3! $ u)! %( "$7$#!) #%(u7% #%! 9-D #u$ !"("+!"# #%$#

    '("))#) ( $" ('! $"3 $ +!!#"7 ((+ L!# u) $))u+! #%$# #%! u)! ) " #%! #u$ ('! $"3 #%!

    u)! #u") $(u"3 #( #%! 3(( ('$#!3 " 10, 24, >1 $"3 (!") # T%!", #%! u)! '()!) #%! 3(( T%!

    u)! #%!" "3) $ '(+u#! #( #%! !#, %'% !)#) " #%! ()#(" 4, 94, 1=,A"3 #%! u)! #*!)

    QFALCON T%!", #%! u)! $.) #( #%! +!!#"7 ((+ $"3 '.) u $ !" ('$#!3 $# 10, 24, =0 $"3

    3$) ("* ("! 3(# " $ $! ('$#!3 " 1, 1=, 90, %'% ) #%! 3(# , * '((3"$#! !$#! #( #%!

     $! )$'! ) 990, 190 T%! u)! #%!" !))!) #%! (7" 8u##(" T%! "#$ !!)!"#$#(" ( u)! 

    $'#(") " #%! 9-D #u$ !"("+!"# '$" 8! !'(3!3 $) (()

    10, 24, >1 A'#(" O!" #%! ('! 3((

    10, 24, >1 A'#(" C()! #%! ('! 3((

    4, 94, 1= A'#(" T*"7, QF

    4, 94, 1= A'#(" T*"7, QA

    4, 94, 1= A'#(" T*"7, QL

    4, 94, 1= A'#(" T*"7, QC

    4, 94, 1= A'#(" T*"7, QO

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    4, 94, 1= A'#(" T*"7, QN

    10, 24, =0 A'#(" P'. u #%! !"

    1, 1=, =0 A'#(" D$"7, ("# 990, 190

    "a# "b#

     Figure $ – "a# %napshot of a proof-of-concept $-& 'irtual en'ironment( here the user is t)ping a

    te*tual passor! on a 'irtual computer as a part of the user+s $-& passor!, "b# %napshot of a proof-

    of-concept 'irtual art galler)( hich contains $ pictures an! si* computers

    T( )+* #%! 3!$ ( %( $ 9-D $))(3 (.), F7 4 )%() $ )#$#! 3$7$+ ( $ ())8! 9-D

     $))(3 $u#%!"#'$#(" )*)#!+

    3-D 5rt.a# Er!'$t D$s& .%$#$s

    D!)7""7 $ !-)#u3!3 9-D #u$ !"("+!"# $!'#) #%! u)$8#*, !!'#!"!)), $"3

    $''!#$8#* ( $ 9-D $))(3 )*)#!+ T%!!(!, #%! )# )#! " 8u3"7 $ 9-D $))(3 )*)#!+ )

    #( 3!)7" $ 9-D !"("+!"# #%$# !!'#) #%! $3+")#$#(" "!!3) $"3 #%! )!'u#* !u!+!"#) T%!

    3!)7" ( 9-D #u$ !"("+!"#) )%(u3 (( #%!)! 7u3!"!)

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     Figure . – %tate !iagram of a possible $-& passor! application

    1 R!$-! )+$#* T%! ()!'#! 9-D #u$ !"("+!"# )%(u3 !!'# %$# !(! $!

    u)!3 #( )!!"7 " !$ ! O8:!'#) u)!3 " #u$ !"("+!"#) )%(u3 8! !$#!* )+$ "

    )?! #( !$ (8:!'#) )?!3 #( )'$! P())8! $'#(") $"3 "#!$'#(") #($3 #u$ (8:!'#)

    )%(u3 !!'# !$-! )#u$#(") O8:!'# !)(")!) )%(u3 8! !$)#' T%! #$7!# )%(u3 %$!

    $ 9-D #u$ !"("+!"# #%$# u)!) '$" "#!$'# #%, 8* u)"7 '(++(" )!")!

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    2 O8:!'# u"u!"!)) $"3 3)#"'#(" E!* #u$ (8:!'# ( #!+ " #%! 9-D #u$ !"("+!"#

    ) 3!!"# (+ $"* (#%! #u$ (8:!'# T%! u"u!"!)) '(+!) (+ #%! $'# #%$# !!*

    #u$ (8:!'# %$) #) (" $##8u#!) )u'% $) ()#(" T%u), #%! ()!'#! "#!$'#(" #%

    (8:!'# 1 ) "(# !u$ #( #%! "#!$'#(" #% (8:!'# 2 H(!!, %$"7 )+$ (8:!'#) )u'% $)

    20 '(+u#!) " ("! $'! +7%# '("u)! #%! u)! T%!!(!, #%! 3!)7" ( #%! 9-D #u$

    !"("+!"# )%(u3 '(")3! #%$# !!* (8:!'# )%(u3 8! 3)#"7u)%$8! (+ (#%! (8:!'#) A

    )+! !$-! !$+! ) %(+! "u+8!"7 A))u+! #%$# #%!! $! 20 ( +(! %(+!) #%$#

    ((. .! !$'% (#%! $"3 #%! %(+!) $! "(# "u+8!!3 I# (u3 8! 3'u# #( 3)#"7u)%

    %'% %(u)! $) )#!3 $ +("#% $7( S+$*, " 3!)7""7 $ 9-D #u$ !"("+!"#, #

    )%(u3 8! !$)* ( u)!) #( "$7$#! #%(u7% $"3 #( 3)#"7u)% 8!#!!" (8:!'#) T%!

    3)#"7u)%"7 $'#( "'!$)!) #%! u)!;) !'(7"#(" ( (8:!'#) T%!!(!, # +(!) #%!

    )*)#!+ u)$8#*

    9 T%!!-3+!")("$ #u$ !"("+!"# )?! A 9-D #u$ !"("+!"# '$" 3!'# $ '#* ( 

    !!" #%! (3 O" #%! (#%! %$"3, # '$" 3!'# $ )$'! $) ('u)!3 $) $ )"7! ((+ ( ('!

    T%! )?! ( $ 9-D !"("+!"# )%(u3 8! '$!u* )#u3!3 A $7! 9-D #u$ !"("+!"#

    "'!$)! #%! #+! !u!3 8* #%! u)! #( !(+ $ 9-D $))(3 M(!(!, $ $7! 9-D

    #u$ !"("+!"# '$" '("#$" $ $7! "u+8! ( #u$ (8:!'#) T%!!(!, #%! (8$8! 9-D

     $))(3 )$'! 8($3!") H(!!, $ )+$ 9-D #u$ !"("+!"# u)u$* '("#$") ("* $

    ! (8:!'#), $"3 #%u), !(+"7 $ 9-D $))(3 #$.! !)) #+!

    4 Nu+8! ( (8:!'#) #!+) $"3 #%! #*!) P$# ( 3!)7""7 $ 9-D #u$ !"("+!"# )

    3!#!+""7 #%! #*!) ( (8:!'#) $"3 %( +$"* (8:!'#) )%(u3 8! $'!3 " #%! !"("+!"#

    T%! #*!) ( (8:!'#) !!'# %$# ."3 ( !)(")!) #%! (8:!'# %$! F( )+'#*, !

    '$" '(")3! !u!)#"7 $ #!#u$ $))(3 ( $ "7!"# $) $" (8:!'# !)(")! #*!

    S!!'#"7 #%! 7%# (8:!'# !)(")! #*!) $"3 #%! "u+8! ( (8:!'#) $!'#) #%! (8$8!

     $))(3 )$'! ( $ 9-D $))(3

    5 S*)#!+ +(#$"'! T%! 9-D #u$ !"("+!"# )%(u3 '(")3! %$# )*)#!+) 8!

     (#!'#!3 8* $ 9-D $))(3 T%! "u+8! ( (8:!'#) $"3 #%! #*!) ( (8:!'#) #%$# %$! 8!!"

    u)!3 " #%! 9-D #u$ !"("+!"# )%(u3 !!'# #%! +(#$"'! ( #%! (#!'#!3 )*)#!+

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    3-D Pass"!r% A//#cat!s

    !'$u)! $ 9-D $))(3 '$" %$! $ $))(3 )$'! #%$# ) !* $7! '(+$!3 #( (#%! 

    $u#%!"#'$#(" )'%!+!), #%! 9-D $))(3;) +$" $'$#(" 3(+$") $! (#!'#"7 '#'$ )*)#!+)

    $"3 !)(u'!) P())8! '#'$ $'$#(") "'u3! #%! (("7

    1 C#'$ )!!) M$"* $7! (7$"?$#(") %$! '#'$ )!!) #%$# $! u)u$* (#!'#!3 8* $

    #!#u$ $))(3 A 9-D $))(3 $u#%!"#'$#(" (()!) $ )(u"3 !$'!+!"# ( $ #!#u$

     $))(3 M(!(!, !"#$"'!) #( )u'% ('$#(") $! u)u$* (#!'#!3 8* $''!)) '$3) $"3

    )(+!#+!) PIN "u+8!) T%!!(!, $ 9-D $))(3 '$" 8! u)!3 #( (#!'# #%! !"#$"'! #(

    )u'% ('$#(") $"3 (#!'# #%! u)$7! ( )u'% )!!)

    2 Nu'!$ $"3 +#$* $'#!) Su'% $'#!) )%(u3 8! (#!'#!3 8* #%! +()# (!u

    $u#%!"#'$#(" )*)#!+) T%! 9-D $))(3 %$) $ !* $7! (8$8! $))(3 )$'!, $"3

    )"'! # '$" '("#$" #(.!"-, 8(+!#')-, !'(7"#("-, $"3 ."(!37!-8$)!3 $u#%!"#'$#(") "

    $ )"7! $u#%!"#'$#(" )*)#!+, # ) $ )(u"3 '%('! ( %7% !! )!'u#* ('$#(")

    9 A$"!) $"3 :!#7%#!) !'$u)! ( #%! ())8! #%!$# ( +)u)"7 $$"!) $"3 :!#7%#!)

    ( !7("-(#'$ $7!"3$), u)$7! ( )u'% $$"!) )%(u3 8! (#!'#!3 8* $ (!u

    $u#%!"#'$#(" )*)#!+ T%! 9-D $))(3 ) !'(++!"3!3 ( #%!)! )*)#!+)

    I" $33#(", 9-D $))(3) '$" 8! u)!3 " !)) '#'$ )*)#!+) 8!'$u)! #%! 9-D #u$ !"("+!"#

    '$" 8! 3!)7"!3 #( # $"* )*)#!+;) "!!3) A )+$ 9-D #u$ !"("+!"# '$" 8! u)!3 " +$"*

    )*)#!+), "'u3"7 #%! (("7

    1 ATM)

    2 P!)("$ 37#$ $)))#$"#)

    9 D!).#( '(+u#!) $"3 $#( (7")

    4

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    SE+,RIY ANAYSIS

    T( $"$*)! $"3 )#u3* %( )!'u! $ )*)#!+ ), ! %$! #( '(")3! %( %$3 # ) ( #%! $##$'.! #(

     8!$. )u'% $ )*)#!+ A ())8! +!$)u!+!"# ) 8$)!3 (" #%! "(+$#(" '("#!"# ( $ $))(3

    )$'!, %'% ) 3!"!3 " 19 $) Q#%! !"#(* ( #%! (8$8#* 3)#8u#(" (! #%$# )$'! 7!" 8*

    #%! !$#! !u!"'!) ( #%! $))(3) #%$# u)!) $'#u$* '%(()!

    !)u#, # ) +(#$"# #( %$! $ )'%!+! #%$# %$) $ !* $7! ())8! $))(3 )$'! $) ("! $'#( ( 

    "'!$)"7 #%! (. !u!3 8* #%! $##$'.! #( 8!$. #%! $u#%!"#'$#(" )*)#!+ A"(#%! $'#( ) #(

    "3 $ )'%!+! #%$# %$) "( !(u) ( !)#"7 ."(!37! ( #%! +()# (8$8! u)! $))(3

    )!!'#(", %'% '$" $)( !))# #%! $##$'. (" )u'% $" $u#%!"#'$#(" )'%!+!

     Figure / - Passor! space of the $-& passor!( te*tual passor!( Passfaces( an! &A% ith gri! 

     si0es of / / an! 1 1, 3ength is the number of actions an! interactions for a $-& passor!( the

    number of characters for te*tual passor!s( the number of selections for Passfaces( an! the number 

    of points that represent the stro4es for &A%, The length is up to eight "characters5actions(

    interactions( inputs5selections#,,

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    3-D Pass"!r% S/ac$ S6$

    O"! +(#$"# $'#( #( 3!#!+"! %( 3'u# # ) #( $u"'% $" $##$'. (" $" $u#%!"#'$#(" )*)#!+

    ) #%! )?! ( #%! $))(3 )$'! T( 3!#!+"! #%! 9-D $))(3 )$'!, ! %$! #( '(u"# $ ())8!

    9-D $))(3) #%$# %$! $ '!#$" "u+8! ( $'#("), "#!$'#("), $"3 "u#) #($3 $ (8:!'#) #%$#!)# " #%! 9-D #u$ !"("+!"#

     (8$8#* ( #%! 9-D $))(3 ( )?! 7!$#! #%$" L+$ ) ?!(

    T( +!$)u! #%! 9-D $))(3 )$'!, ! '$'u$#! L +$, G (" $ 9-D #u$ !"("+!"# #%$#

    %$) #%! )$'! G G G ( $ 9-D $))(3 ( $ !"7#% "u+8! ( $'#("), "#!$'#("), $"3

    "u#) ( L+$ ( !))

    I" #%! (("7 !!))(", AC !!)!"#) #%! ())8! $'#(") #($3 #%! 9-D #u$ !"("+!"#,

    %!!$) !!)!"#) #%! #(#$ "u+8!) ( ())8! 9-D $))(3) ( !"7#% L+$ ( !))

    I" #%! (("7 !!))(" 2, 6+$ ) #%! "u+8! ( (8:!'#) " #%! 9-D #u$ !"("+!"#

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    T%! u"'#(" ) 3!#!+"!3 (+ #%! (8:!'# #*! I# '(u"#) #%! ())8! $'#(") $"3 "#!$'#(") #%$#

    #%! (8:!'# '$" $''!# I ! $))u+! #%$# $" (8:!'# Q@!*8($3 ) " ('$#(" 0, *0, ?0 ( #*!

    #!#u$ $))(3, '(u"# #%! ())8! '%$$'#!) $"3 "u+8!) #%$# '$" 8! #*!3, %'% ) $(u"3

    >9 ())8#!) A) ! +!"#("!3 8!(!, $" (8:!'# #*! ) ("! ( #%! +(#$"# $'#() #%$# $!'#)

    #%! (!$ $))(3 )$'! T%!!(!, %7%! (u#'(+!) ( u"'#(" +!$" $7! 9-D$))(3 )$'!

    )?!

     Figure - Passor! space of the $-& passor!( te*tual passor!( Passfaces( an! &A% ith gri! 

     si0es of / / an! 1 1, 3ength is the number of actions an! interactions for a $-& passor!(

    the number of characters for te*tual passor!s( the number of selections for Passfaces( an! the

    number of points that represent the stro4es for &A%, The length is up to eight "characters5actions(

    interactions( inputs5selections#,

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     Figure 8 - obser'ing the number of possible actions5interactions of a $-& passor! ithin a $-&

    en'ironment specifie! in %ection 9-A compare! to the to critical points of te*tual passor!s, Point 

    :a; is the bit si0e of  "$ 1  # !ictionar) of eight-character te*tual passor!s, Point

    :b; represents the full passor! space of eight-character te*tual passor!s,

    F7 )%() #%! ("#) %!! #%! 9-D $))(3 !'!!3) #( +(#$"# #!#u$ $))(3 ("#)

    P("# Q$ )%() #%$# 8* %$"7 ("* #( $'#(") $"3 "#!$'#(") $) $ 9-D $))(3, #%! 9-D

     $))(3 !'!!3) #%! "u+8! ( #!#u$ $))(3) u)!3 8* @!"2

      #( 8!$. 25 ( #!#u$

     $))(3) ( !7%# '%$$'#!) P("# Q8 !!)!"#) #%! u #!#u$ $))(3 )$'! ( !7%# '%$$'#!)

    ( !)) I# )%() #%$# 8* !(+"7 ("* (u "#!$'#("), $'#("), $"3 "u#) $) $ 9-D $))(3, #%!

    9-D $))(3 )$'! !'!!3) #%! u #!#u$ $))(3) ( !7%# '%$$'#!) ( !))

    F(+ #%! !(u) !u$#("), ! (8)!! #%$# #%! "u+8! ( (8:!'#) $"3 #%! #*! ( $'#(") $"3

    "#!$'#(") 3!#!+"!) #%! (8$8! $))(3 )$'! T%!!(!, #%! 3!)7" ( #%! 9-D #u$

    !"("+!"# ) $ !* '#'$ $# ( #%! 9-D $))(3 )*)#!+ F7) 4 $"3 5 u)#$#! #%! !)u#"7

     $))(3 )$'! ( #%! (()!3 9-D $))(3 '(+$!3 #( #!#u$ $))(3, P$))$'!), $"3 DAS ( 

    $ 73 ( 5 5 $"3 10 10, !)!'#!* N(#'! #%! 3!!"'! 8!#!!" $ 9-D $))(3) 8u# (" $

    )+! 9-D #u$ !"("+!"# '(+$!3 #( #%! (#%! $u#%!"#'$#(" )'%!+!)

    3-D Pass"!r% Dstrb.t! K!"#$%&$

    S#u3*"7 #%! u)!;) 8!%$( ( $))(3 )!!'#(" $"3 ."("7 #%! +()# (8$8! #!#u$ $))(3)

    $! #%! .!* 8!%"3 3'#("$* $##$'.) @!"2

     u)!3 )u'% ."(!37! #( '(!'# $ )+$ )!# ( 9 106

    (3) #%$# %$! $ %7% (8$8#* ( u)$7! $+("7 u)!) T%! u!)#(" ) %( %$) )u'% "(+$#("

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    %7%* (8$8! $))(3) 8!!" (u"3 $"3 %* U)!) #!"3 #( '%(()! (3) #%$# %$! +!$""7,

    )u'% $) $'!), "$+!), $+(u) !(!;) "$+!), )(#) #!+), $"3 8((7'$ #!+"((7!) T%!!(!,

    "3"7 #%!)! 3!!"# (3) (+ #%! 3'#("$* ) $ !$#!* )+! #$). U)"7 )u'% ."(!37!

    *!3) $ %7% )u''!)) $#! ( 8!$."7 #!#u$ $))(3) A"* $u#%!"#'$#(" )'%!+! ) $!'#!3 8*

    #%! ."(!37! 3)#8u#(" ( #%! u)!;) )!'!#) A''(3"7 #( D$) !# $ >, P$))$'!) = u)!) #!"3

    #( '%(()! $'!) #%$# !!'# #%! (" #$)#! (" $'$ $##$'#!"!)), $'!, $"3 7!"3! M(!(!, 10

    ( +$! $))(3) %$! 8!!" 7u!))!3 " ("* #( 7u!))!) A"(#%! )#u3*14

     $8(u# u)! )!!'#(" ( 

    DAS19

     '("'u3!3 #%$# ( #%! )!'!# $))(3), u)!) #!"3 #( 3$ #%"7) #%$# %$! M!$""7,

    %'% )+!) #%! $##$'.!;) #$).

    Cu!"#*, ."(!37! $8(u# u)! 8!%$() (" )!!'#"7 #%! 9-D $))(3 3(!) "(# !)# E!* u)! 

    %$) 3!!"# !u!+!"#) $"3 !!!"'!) %!" )!!'#"7 #%! $($#! 9-D $))(3 T%) $'#

    "'!$)! #%! !(# !u!3 #( "3 $ $##!" ( u)!;) %7%* )!!'#!3 9-D $))(3 I" $33#(",

    )"'! #%! 9-D $))(3 '(+8"!) )!!$ $u#%!"#'$#(" )'%!+!) "#( $ )"7! $u#%!"#'$#("

    !"("+!"#, #%! $##$'.! %$) #( )#u3* !!* )"7! $u#%!"#'$#(" )'%!+! $"3 %$) #( 3)'(! %$#

    #%! +()# (8$8! )!!'#!3 )!'!#) $! F( #!#u$ $))(3, #%! %7%* (8$8! )!!'#!3 #!#u$

     $))(3 +7%# 8! 3!#!+"!3 8* #%! u)! ( 3'#("$!) H(!!, #%!! $! +$"* $u#%!"#'$#("

    )'%!+!) #% u"3)'(!!3 (8$8! $))(3 )$'!

    S"'! !!* 9-D $))(3 )*)#!+ '$" 8! 3!)7"!3 $''(3"7 #( #%! (#!'#!3 )*)#!+ !u!+!"#),#%! $##$'.! %$) #( )!$$#!* )#u3* !!* 9-D $))(3 )*)#!+ T%) ) 8!'$u)! (8:!'#) #%$# !)# "

    ("! 9-D $))(3 )*)#!+ +7%# "(# !)# (" (#%! 9-D $))(3 )*)#!+) T%!!(!, +(! !(# )

    !u!3 #( 8u3 #%! ."(!37! ( +()# (8$8! 9-D $))(3)

    Attacks a% +!.t$r'$as.r$s

    T( !$?! $"3 u"3!)#$"3 %( $ $" $u#%!"#'$#(" )'%!+! ) )!'u!, ! %$! #( '(")3! $

     ())8! $##$'. +!#%(3)

    %$! #( "3 #%! '(u"#!+!$)u!) #%$# !!"# )u'% $##$'.) I" #%) )!'#(", ! #* #( '(! +()#

     ())8! $##$'.) $"3 %!#%! #%! $##$'. ) $3 ( "(# M(!(!, ! #* #( (()! '(u"#!+!$)u!)

    ( )u'% $##$'.)

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    1  ?rute Force Attac4@ T%! $##$'.! %$) #( #* $ ())8! 9-D $))(3) T%) ."3 ( $##$'. )

    !* 3'u# ( #%! (("7 !$)(")

    $ T+! !u!3 #( (7" T%! #(#$ #+! "!!3!3 ( $ !7#+$#! u)! #( (7" +$* $*

    (+ 20 ) #( 2 +" ( +(!, 3!!"3"7 (" #%! "u+8! ( "#!$'#(") $"3 $'#("), #%!

    )?! ( #%! 9-D #u$ !"("+!"#, $"3 #%! #*! ( $'#(") $"3 "#!$'#(") 3("! 8*

    #%! u)! $) $ 9-D $))(3 T%!!(!, $ 8u#! ('! $##$'. (" $ 9-D $))(3 ) !*

    3'u# $"3 #+! '(")u+"7

     8 C()# ( $##$'.) I" $ 9-D #u$ !"("+!"# #%$# '("#$") 8(+!#' !'(7"#("

    (8:!'#) $"3 #(.!"-8$)!3 (8:!'#), #%! $##$'.! %$) #( (7! $ ())8! 8(+!#'

    "(+$#(" $"3 (7! $ #%! !u!3 #(.!") T%! '()# ( (7"7 )u'% "(+$#(" )

    !* %7% #%!!(!, '$'."7 #%! 9-D $))(3 ) +(! '%$!"7"7 M(!(!, #%!

    %7% "u+8! ( ())8! 9-D $))(3 )$'!) $) )%(" " T$8! I !$!) #%! $##$'.! 

    #% $+()# "( '%$"'! ( 8!$."7 #%! 9-D $))(3

    2 ell-%tu!ie! Attac4@ T%! $##$'.! #!) #( "3 #%! %7%!)# (8$8! 3)#8u#(" ( 9-D

     $))(3) H(!!, #( $u"'% )u'% $" $##$'., #%! $##$'.! %$) #( $'u! ."(!37! ( #%!

    +()# (8$8! 9-D $))(3 3)#8u#(") A'u"7 )u'% ."(!37! ) !* 3'u#

     8!'$u)! #%! $##$'.! %$) #( )#u3* $ #%! !)#"7 $u#%!"#'$#(" )'%!+!) #%$# $! u)!3 " #%! 9-

    D !"("+!"# M(!(!, $'u"7 )u'% ."(!37! +$* !u! (7"7 $ !)#"7

     8(+!#'$ 3$#$ $"3 +$* !u! (7"7 #(.!"-8$)!3 3$#$ I" $33#(", # !u!) $ )#u3* ( 

    #%! u)!;) )!!'#(" ( (8:!'#), ( $ '(+8"$#(" ( (8:!'#), #%$# #%! u)! u)! $) $ 9-D

     $))(3 M(!(!, $ !-)#u3!3 $##$'. ) !* %$3 #( $''(+)% )"'! #%! $##$'.! %$) #(

     !(+ $ 'u)#(+?!3 $##$'. ( !!* 3!!"# 9-D #u$ !"("+!"# 3!)7" E!* )*)#!+

    '$" 8! (#!'#!3 8* $ 9-D $))(3 #%$# ) 8$)!3 (" $ u"u! 9-D #u$ !"("+!"# T%)

    !"("+!"# %$) $ "u+8! ( (8:!'#) $"3 #*!) ( (8:!'# !)(")!) #%$# 3! (+ $"* (#%! 

    9-D #u$ !"("+!"# T%!!(!, $ '$!u* 'u)#(+?!3 )#u3* ) !u!3 #( "#$?! $"

    !!'#! $##$'.

    9 S%(u3! Su"7 A##$'. A" $##$'.! u)!) $ '$+!$ #( !'(3 #%! u)!;) 9-D $))(3 ( #!)

    #( $#'% #%! !7#+$#! u)! %! #%! 9-D $))(3 ) 8!"7 !(+!3 T%) $##$'. ) #%!

    +()# )u''!))u #*! ( $##$'. $7$")# 9-D $))(3) $"3 )(+! (#%! 7$%'$ $))(3)

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    H(!!, #%! u)!;) 9-D $))(3 +$* '("#$" 8(+!#'$ 3$#$ ( #!#u$ $))(3) #%$#

    '$""(# 8! )!!" (+ 8!%"3 T%! $##$'.! +$* 8! !u!3 #( #$.! $33#("$ +!$)u!) #(

     8!$. #%! !7#+$#! u)!;) 9-D $))(3 T%!!(!, ! $))u+! #%$# #%! 9-D $))(3 )%(u3

     8! !(+!3 " $ )!'u! $'! %!! $ )%(u3! )u"7 $##$'. '$""(# 8! !(+!3

    ./ T+"7 A##$'. I" #%) $##$'., #%! $##$'.! (8)!!) %( ("7 # #$.!) #%! !7#+$#! u)! #(

     !(+ $ '(!'# )7"-" u)"7 #%! 9-D $))(3 T%) (8)!$#(" 7!) #%! $##$'.! $"

    "3'$#(" ( #%! !7#+$#! u)!;) 9-D $))(3 !"7#% H(!!, #%) ."3 ( $##$'. $("!

    '$""(# 8! !* )u''!))u )"'! # 7!) #%! $##$'.! +!! %"#) T%!!(!, # (u3 (8$8*

     8! $u"'%!3 $) $# ( $ !-)#u3!3 ( 8u#! ('! $##$'. T+"7 $##$'.) '$" 8! !*

    !!'#! #%! 9-D #u$ !"("+!"# ) ((* 3!)7"!3

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    E7PERIENA RES,S

    u)!3 $ 1=0-GH? P!"#u+ M C!"#"( +$'%"! #% 512-M $"3(+ $''!)) +!+(* $"3 ATI

    M(8#* R$3!(" >600 3!( '$3

    T%! 3!)7" ( #%! !!+!"#$ 9-D #u$ !"("+!"# !!)!"#) $" $# 7$!* #%$# #%! u)! '$"

    $. #%(u7% $"3 ) 3!'#!3 " F7 9

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    Table 1 - Resulting number of possible $-! passor!s of total length 3 ma*

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    ,s$r St.%8

    )#u3* !!!3 #%! u)$7! ( #!#u$ $))(3) $"3 (#%! $u#%!"#'$#(" )'%!+!) T%! )#u3* '(!!3

    $+()# 90 u)!) T%! u)!) $!3 " $7!, )!, $"3 !3u'$#(" !! E!" #%(u7% # ) $ )+$ )!# ( 

    u)!), #%! )#u3* (3u'!3 )(+! 3)#"'# !)u#)19

     $))(3), 9-D $))(3), $"3 (#%! $u#%!"#'$#(" )'%!+!)

    1 M()# u)!) %( u)! #!#u$ $))(3) ( >12 '%$$'#! !"7#%) ( %( u)! $"3(+

    '%$$'#!) $) $ $))(3 %$! ("* ("! #( #%!! u"u! $))(3)

    2 M(! #%$" 50 ( u)!;) #!#u$ $))(3) $! !7%# '%$$'#!) ( !))

    9 A+()# 25 ( u)!) u)! +!$""7u (3) $) #%! #!#u$ $))(3)

    4 A+()# 5 ( u)!) u)! +!$""7u (3) ( $#$* +!$""7u (3) $) #%! #!#u$

     $))(3) I" '("#$)#, ("* 25 ( u)!) u)! $"3(+ '%$$'#!) $"3 !##!) $) #!#u$

     $))(3)

    5 O! 40 ( u)!) %$! ("* ("! #( #%!! u"u! #!#u$ $))(3), $"3 (! >0 ( u)!)

    %$! !7%# u"u! #!#u$ $))(3) ( !))

    6 O! >0 ( u)!) 3( "(# '%$"7! #%! #!#u$ $))(3) u"!)) #%!* $! !u!3 #( 8* #%!)*)#!+

    O! >5 ( u)!) u"3! )#u3* %$! "!! u)!3 $"* 7$%'$ $))(3 )'%!+! $) $ +!$") ( 

    $u#%!"#'$#("

    = M()# u)!) !! #%$# 9-D $))(3) %$! $ %7% $''!#$8#*

    > M()# u)!) 8!!! #%$# #%!! ) "( #%!$# #( !)("$ $'* 8* u)"7 $ 9-D $))(3 $) $"

    $u#%!"#'$#(" )'%!+!

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      +HAPER - 2IERA,RE RE5IEW

     

    tt/::""";$$$/#!r$;$$$;!r& A" IEEE $! u8)%!3 " 200= $) #%! 8$)' "(+$#(")(u'!

    tt/::""";8!.t.b$;c!' M!#'u(u) 3!#$) $8(u# #%! 9D $))(3) $"3 9D #u$

    !"("+!"# !! #%! !)u# ( $(u) 3!() $$$8! (" Y(uTu8!

    tt/::""";3%as;c!' BAS ) $ "!#(. ( 9D #u$ G$!!) ( 3)$*"7 $# (" #%!

    "#!"!# A"* $#)# "#!!)#!3 " +(u"#"7 $" !%8#(" '$" 3( )( " $ )+!, u)! !"3*

    $* A *(u %$! #( 3( ) (!" $" $''(u"# ( !!, '%(()! $" $($#! 9D 7$!* $"3

    u($3 *(u $#(.) O"'! *(u! 3("! #%$#, $"*("! '$" )# *(u !%8#(" E!* )#( 

    ) !!)!"#!3 8* $ 9D '%$$'#!, $("7 !!*("! #( )!! $"3 8! )!!" " #%! 93 7$!* )$'!

    " !$-#+!

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      +HAPER - 3+ON+,SION AND *,,RE WORK 

    T%!! $! +$"* $u#%!"#'$#(" )'%!+!) " #%! 'u!"# )#$#! S(+! ( #%!+ $! 8$)!3 (" u)!;)

     %*)'$ $"3 8!%$($ (!#!), $"3 )(+! (#%! $u#%!"#'$#(" )'%!+!) $! 8$)!3 (" u)!;)

    ."(!37! )u'% $) #!#u$ $"3 7$%'$ $))(3) M(!(!, #%!! $! )(+! (#%! +(#$"#

    $u#%!"#'$#(" )'%!+!) #%$# $! 8$)!3 (" %$# *(u %$!, )u'% $) )+$# '$3) A+("7 #%! $(u)

    $u#%!"#'$#(" )'%!+!), #!#u$ $))(3 $"3 #(.!"-8$)!3 )'%!+!), ( #%! '(+8"$#(" ( 8(#%, $!

    '(++("* $!3 H(!!, $) +!"#("!3 8!(!, 8(#% $u#%!"#'$#(" )'%!+!) $! u"!$8! #(

    '!#$" $##$'.) M(!(!, #%!! $! +$"* $u#%!"#'$#(" )'%!+!) #%$# $! 'u!"#* u"3! )#u3* $"3

    #%!* +$* !u! $33#("$ #+! $"3 !(# #( 8! $'$8! ( '(++!'$ u)!

    T%! 9-D $))(3 ) $ +u#$'#( $u#%!"#'$#(" )'%!+! #%$# '(+8"!) #%!)! $(u) $u#%!"#'$#("

    )'%!+!) "#( $ )"7! 9-D #u$ !"("+!"# T%! #u$ !"("+!"# '$" '("#$" $"* !)#"7

    $u#%!"#'$#(" )'%!+! ( !!" $"* u'(+"7 $u#%!"#'$#(" )'%!+!) 8* $33"7 # $) $ !)(")! #(

    $'#(") !(+!3 (" $" (8:!'# T%!!(!, #%! !)u#!3 $))(3 )$'! 8!'(+!) !* $7! '(+$!3

    #( $"* !)#"7 $u#%!"#'$#(" )'%!+!)

    T%! 3!)7" ( #%! 9-D #u$ !"("+!"#, #%! )!!'#(") ( (8:!'#) ")3! #%! !"("+!"#, $"3 #%!

    (8:!'#;) #*! !!'# #%! !)u#!3 $))(3 )$'! I# ) #%! #$). ( #%! )*)#!+ $3+")#$#( #( 3!)7"

    #%! !"("+!"# $"3 #( )!!'# #%! $($#! (8:!'# #%$# !!'#) #%! (#!'#!3 )*)#!+ !u!+!"#)

    A33#("$*, 3!)7""7 $ )+! $"3 !$)* #( u)! 9-D #u$ !"("+!"# ) $ $'#( #%$# !$3) #( $

    %7%! u)! $''!#$8#* ( $ 9-D $))(3 )*)#!+

    T%! '%('! ( %$# $u#%!"#'$#(" )'%!+!) 8! $# ( #%! u)!;) 9-D $))(3 !!'#) #%! u)!;)

     !!!"'!) $"3 !u!+!"#)M(!(!, u)!) %( !! #( .!! $"* ."3 ( 8(+!#'$ 3$#$

     $#! +7%# "(# "#!$'# #% (8:!'#) #%$# !u! 8(+!#' "(+$#(" T%!!(!, # ) #%! u)!;)

    '%('! $"3 3!')(" #( '(")#u'# #%! 3!)!3 $"3 !!!3 9-D $))(3

    T%! 9-D $))(3 ) )# " #) !$* )#$7!) D!)7""7 $(u) ."3) ( 9-D #u$ !"("+!"#),

    3!'3"7 (" $))(3 )$'!), $"3 "#!!#"7 u)! !!38$'. $"3 !!!"'!) (+ )u'%

    !"("+!"#) !)u# " !"%$"'"7 $"3 +("7 #%! u)! !!!"'! ( #%! 9-D $))(3

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    M(!(!, 7$#%!"7 $##$'.!) (+ 3!!"# 8$'.7(u"3) #( 8!$. #%! )*)#!+ ) ("! ( #%! u#u!

    (.) #%$# !$3 #( )*)#!+ +(!+!"# $"3 (! #%! '(+!#* ( 8!$."7 $ 9-D $))(3

    M(!(!, # 3!+(")#$#! %( #%! $##$'.!) $'u! #%! ."(!37! ( #%! +()# (8$8! 9-D

     $))(3) #( $u"'% #%! $##$'.)

    S%(u3! )u"7 $##$'.) $! )# ())8! $"3 !!'#! $7$")# 9-D $))(3) T%!!(!, $ (! 

    )(u#(" ) $ !3 ( !)!$'%

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      +HAPER - 4RE*EREN+ES

    =1> Su(, Y %u, $"3 G S O!", QG$%'$ $))(3) A )u!*, "  Proc, 21st Annu,

    Comput, %ecurit) Appl, Conf,, D!' 5>, 2005, 46942 

    =2> D B @!", QF("7 #%! '$'.! A )u!* (, $"3 +(!+!"# #( $))(3) )!'u#*, "

     Proc, B%DE %ecurit) or4shop, 1>>0, 514 Au#%(?!3 '!")!3 u)! +#!3 #( IEEE

    (! 3("($3!3 (" M$'% 5, 200> $# 029= (+ IEEE (! R!)#'#(") $* 1>9=

    IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, BOL 5, NO

    >, SEPTEMER 200=

    =$>  NC "!),  AT Frau!@ ?an4ing on our one)( &ateline Hi!!en Cameras %ho Criminals

    6ning ATs, D!' 11, 2009 

    =.> T @##!",   C "!), Cash achine Frau! up( %a) ?an4s, N( 4, 2006

    => G E ("3!, QG$%'$ $))(3, US P$#!"# 5 55> >61, S! 24, 1>>6

    =8> R D%$+:$ $"3 A P!7, QD:K Bu A u)! )#u3* u)"7 +$7!) ( $u#%!"#'$#(", "  Proc,

    Ith B%ED %ecurit) %)mp,, D!"!, CO, Au7 2000, 455= 

    =J> R!$ U)! C(($#(", The %cience ?ehin! Passfaces 2005, O'# O""! A$$8!

    %##//!$u)!)'(+

    =I> D D$), F M("()!, $"3 M @ R!#!, QO" u)! '%('! " 7$%'$ $))(3 )'%!+!), "

     Proc, 1$th B%DE %ecurit) %)mp,, S$" D!7(, CA, Au7 2004, 114 

    =1> S S

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    2005J!+*", A M$*!, F M("()!, M @ R!#!, $"3 A D Ru8", QT%! 3!)7" $"3 $"$*))

    ( 7$%'$ $))(3), " Proc, Jth B%DE %ecurit) %)mp, , >>,

    114

    =1$> J T%(! $"3 P C $" O()'%(#, QG$%'$ 3'#("$!) $"3 #%! +!+($8! )$'! ( 7$%'$

     $))(3), " Proc, B%DE %ecurit), S$" D!7(, CA, Au7 >19, 2004, 10

    A3$+) $"3 M A S$))!, QU)!) $! "(# #%! !"!+*