35
CRYPTOGRAPHY SANDHIYA S RANJTHA B

Cryptography

Tags:

Embed Size (px)

DESCRIPTION

 

Citation preview

Page 1: Cryptography

CRYPTOGRAPHY

SANDHIYA SRANJTHA B

Page 2: Cryptography

CRYPTOGRAPHIC TERMINOLOGY

• PLAIN TEXT: The format of the data before encrypted.

• CIPHER TEXT: The scrambled format of data after being encrypted.

• ENCRYPTION: Method of transforming plain text into an unreadable format.

• DECRYPTION: Method of obtaining the encrypted text into plain text.

Page 3: Cryptography

What is Cryptography

The art of protecting information by transforming it (Encrypting it) into an unreadable format, called Cipher text, only those who posses a secret key can Decipher or (Decrypt) the message into Plain text.

Page 4: Cryptography
Page 5: Cryptography

WHY WE NEED A CRYPTOGRAGHY

• For confidentiality

• For authentication

• For data integrity

Page 6: Cryptography

BASIC CONCEPT OF CRYPTOGRAPHY

Page 7: Cryptography
Page 8: Cryptography

SYMMETRIC KEY ENCRYPTION

Page 9: Cryptography

TYPES OF SYMMETRIC

ENCRYPTION oSUBSTITUTION CIPHERoTRANSPOSTION CIPERoVERNAM CIPER

Page 10: Cryptography
Page 11: Cryptography
Page 12: Cryptography

A- 0B- 1C- 2D- 3E- 4F- 5G- 6H- 7I- 8J- 9K- 10L- 11M-12N- 13O- 14P- 15Q- 16R- 17S- 18T- 19U- 20V- 21W-22X- 23Y- 24Z- 25

Page 13: Cryptography
Page 14: Cryptography

PUBLIC /PRIVATE KEY

• A public key known to everyone • private or secret key known only to the

recipient of the message• When John wants to send a secure

message to Jane, he uses Jane's public key to encrypt the message. Jane then uses her private key to decrypt it.

Page 15: Cryptography

ASYMMETRIC KEY ENCRYPTION

Page 16: Cryptography

TYPES OF ASYMMETRIC ALGORITHMS

DIFFIE-HELLMANRSAEI GAMALELLIPTIC CURVE CRYPTOGRAPHY(ECC)

Page 17: Cryptography

DIFFIE-HELLMAN METHOD

Alice and Bob were communicating each other via mail

Eve trying to hack the message To avoid hacking they are using

DIFFIE-HELLMAN METHOD

Page 18: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

alice Bob

Eve

Page 19: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

Page 20: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

Page 21: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

Page 22: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

Page 23: Cryptography

Alice Bob

Eve

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Page 24: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Eve

Page 25: Cryptography

Alice Bob

Eve

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Page 26: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

3xmod 17

3xmod 17

3xmod 17

Page 27: Cryptography

EXAPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

3xmod 17

3xmod 17

3xmod 17

Random Number=15Random Number=13

Page 28: Cryptography

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Alice Bob

Eve

3xmod 17

3xmod 17

3xmod 17

Random Number=15Random Number=13

315 mod 17=6313mod 17=12

Page 29: Cryptography

Alice Bob

Eve

3xmod 17

3xmod 17

3xmod 17

Random Number=15Random Number=13

315 mod 17=6 12 = 313mod 17

6

6

12

12

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Page 30: Cryptography

Alice Bob

Eve

3xmod 17

3xmod 17

3xmod 17

Random Number=15Random Number=13

315 mod 17=6 12 = 313mod 17

6

6

12

12

1215mod 17=10 613mod17=10

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Page 31: Cryptography

Alice Bob

Eve

3xmod 17

3xmod 17

3xmod 17

Random Number=15Random Number=13

315 mod 17=6 12 = 313mod 17

6

6

12

12

1215mod 17=10 613mod17=10

36mod17=15312mod17=4

EXAMPLE FOR DIFFIE-HELLMAN METHOD

Page 32: Cryptography
Page 33: Cryptography
Page 34: Cryptography
Page 35: Cryptography

Cryptography and Security in Wireless Sensor …Cryptography Cryptography De nition Cryptography is the study of mathematical techniques related to aspects of information security

Cryptography and Security in Wireless Sensor …Cryptography Cryptography De nition Cryptography is the study of mathematical techniques related to aspects of information security

Documents
Cryptography and Network Security, part I: Basic cryptography

Cryptography and Network Security, part I: Basic cryptography

Documents
Slide #8-1 Chapter 8: Basic Cryptography Classical Cryptography Public Key Cryptography Cryptographic Checksums

Slide #8-1 Chapter 8: Basic Cryptography Classical Cryptography Public Key Cryptography Cryptographic Checksums

Documents
Quantum computing, teleportation, cryptography Computing Teleportation Cryptography

Quantum computing, teleportation, cryptography Computing Teleportation Cryptography

Documents
Basic Cryptography - Sapienzaparisi/Risorse/CryptographicPrimitives.pdf · Basic Cryptography Introduction ... The Java Cryptography Architecure (JCA) The Java Cryptography Extensions

Basic Cryptography - Sapienzaparisi/Risorse/CryptographicPrimitives.pdf · Basic Cryptography Introduction ... The Java Cryptography Architecure (JCA) The Java Cryptography Extensions

Documents
An Introduction to Cryptography - Higher Intellectcdn.preterhuman.net/texts/cryptography/IntroToCrypto.pdfAn Introduction to Cryptography v Preface Cryptography is the stuff of spy

An Introduction to Cryptography - Higher Intellectcdn.preterhuman.net/texts/cryptography/IntroToCrypto.pdfAn Introduction to Cryptography v Preface Cryptography is the stuff of spy

Documents
Lattice-based Cryptography · Cryptography Post-Quantum CryptographyResults and Perspectives Outline 1 Cryptography Fundamental Goals Techniques and Limitations 2 Post-Quantum Cryptography

Lattice-based Cryptography · Cryptography Post-Quantum CryptographyResults and Perspectives Outline 1 Cryptography Fundamental Goals Techniques and Limitations 2 Post-Quantum Cryptography

Documents
Java*Cryptography - Cogent Logic · Java*Cryptography Symmetric*Key*Cryptography • Cryptography. Cryptography

Java*Cryptography - Cogent Logic · Java*Cryptography Symmetric*Key*Cryptography • Cryptography. Cryptography

Documents
Chapter 3 Cryptography - Reading & Learning...Chapter 3 Cryptography Introduction: Cryptography is an ancient art of keeping secrets. Cryptography ensures security of communication

Chapter 3 Cryptography - Reading & Learning...Chapter 3 Cryptography Introduction: Cryptography is an ancient art of keeping secrets. Cryptography ensures security of communication

Documents
Elliptic Curve Cryptography based Threshold Cryptography (ECC- TC)

Elliptic Curve Cryptography based Threshold Cryptography (ECC- TC)

Documents
Information Security Cryptography ( L03- Old Cryptography Algorithms )

Information Security Cryptography ( L03- Old Cryptography Algorithms )

Technology
Post-Quantum Cryptography: Lattice-Based Cryptography and

Post-Quantum Cryptography: Lattice-Based Cryptography and

Documents
Introduction to Practical Cryptography Lecture 2 Public Key Cryptography

Introduction to Practical Cryptography Lecture 2 Public Key Cryptography

Documents
Notes on cryptography · Notes on cryptography ... 5 Public-key cryptography: RSA and El-Gamal 83 ... 1.2 Steganography and cryptography

Notes on cryptography · Notes on cryptography ... 5 Public-key cryptography: RSA and El-Gamal 83 ... 1.2 Steganography and cryptography

Documents
Innovative field of cryptography: DNA cryptography

Innovative field of cryptography: DNA cryptography

Documents
Palladium Cryptography Palladium Cryptography Next ... · Palladium Cryptography Palladium Cryptography Next Generation Security Computation Base Harshwardhan Rathore, Asst. Prof

Palladium Cryptography Palladium Cryptography Next ... · Palladium Cryptography Palladium Cryptography Next Generation Security Computation Base Harshwardhan Rathore, Asst. Prof

Documents
Bronson Jastrow. Outline What is cryptography? Symmetric Key Cryptography Public Key Cryptography How Public Key Cryptography Works Authenticating

Bronson Jastrow. Outline What is cryptography? Symmetric Key Cryptography Public Key Cryptography How Public Key Cryptography Works Authenticating

Documents
Cryptography - Number Theory an Related Alghoritm in Cryptography

Cryptography - Number Theory an Related Alghoritm in Cryptography

Documents
Cryptography - Report Advanced Cryptography Standard AES.pdf

Cryptography - Report Advanced Cryptography Standard AES.pdf

Documents
Cryptography - CISSP Study Guide on Cryptography

Cryptography - CISSP Study Guide on Cryptography

Documents
Cryptography - A Reviewweb.cse.msstate.edu/~ramkumar/review1.pdfSymmetric Cryptography Asymmetric Cryptography Key Management Network Security Symmetric Cryptography Overview Block

Cryptography - A Reviewweb.cse.msstate.edu/~ramkumar/review1.pdfSymmetric Cryptography Asymmetric Cryptography Key Management Network Security Symmetric Cryptography Overview Block

Documents
Kleptography: Using Cryptography Against Cryptography · 2017-08-27 · Kleptography: Using Cryptography Against Cryptography Adam Young* and Moti Yung” Abstract. The notion of

Kleptography: Using Cryptography Against Cryptography · 2017-08-27 · Kleptography: Using Cryptography Against Cryptography Adam Young* and Moti Yung” Abstract. The notion of

Documents
ECE578 Cryptography 5: Hash Functions, Asymmetric Cryptography

ECE578 Cryptography 5: Hash Functions, Asymmetric Cryptography

Documents
Cryptography -

Cryptography -

Documents
univie.ac.atothes.univie.ac.at/27163/1/2013-02-27_0501793.pdf · Quantum Cryptography in the Tokyo Metropolitian Area 2.). Quantum cryptography 2.1.Classical Cryptography Cryptography

univie.ac.atothes.univie.ac.at/27163/1/2013-02-27_0501793.pdf · Quantum Cryptography in the Tokyo Metropolitian Area 2.). Quantum cryptography 2.1.Classical Cryptography Cryptography

Documents
Elliptic Curve Cryptography (ECCrinaldi.munir... · 1. Andreas Steffen, Elliptic Curve Cryptography, ZürcherHochschuleWinterthur. 2. DebdeepMukhopadhyay, Elliptic Curve Cryptography

Elliptic Curve Cryptography (ECCrinaldi.munir... · 1. Andreas Steffen, Elliptic Curve Cryptography, ZürcherHochschuleWinterthur. 2. DebdeepMukhopadhyay, Elliptic Curve Cryptography

Documents
Overview of Cryptography What is Cryptography? Cryptography is a collection of mathematical techniques for protecting information. Cryptography is

Overview of Cryptography What is Cryptography? Cryptography is a collection of mathematical techniques for protecting information. Cryptography is

Documents
Quantum cryptography CS415 Biometrics and Cryptography UTC/CSE

Quantum cryptography CS415 Biometrics and Cryptography UTC/CSE

Documents
Information Security Cryptography ( L02- Types Cryptography)

Information Security Cryptography ( L02- Types Cryptography)

Technology
DNA BASED CRYPTOGRAPHY - Western Universitylila/kavita.pdf · 2 Overview • Cryptography in general • Need of Cryptography • Basic concepts in Cryptography - Plaintext - Cipher

DNA BASED CRYPTOGRAPHY - Western Universitylila/kavita.pdf · 2 Overview • Cryptography in general • Need of Cryptography • Basic concepts in Cryptography - Plaintext - Cipher

Documents