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Asymmetric key
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Asymmetric
key
What is CRYPTOGRAPHY ?
• Cryptography is an art of protecting information by transforming it
(encrypting it) in to an unreadable format called cipher text. Only those who possess a secret key can decipher (for decrypt) the massage into plaintext.
ELEMENTS OF CRYPTOGRAPHY
• Plain text• Cipher text• Cipher• Encryption • Decryption
Encryption
Key 1
Decryption
Key 2
Plain text
Plain text Cipher text
Cipher text
Cryptography algorithms aredivided into two groups and
theyare:
• Symmetric key• Asymmetric key
Asymmetric key
Two key:-
1) public key
2)private key
Advantages
Convenience Provides for message authentication: Detection of tampering: Provide for non-repudiation:
Disadvantages
• Public keys should/must be authenticated: • Slow: • Uses up more computer resources:• Widespread security compromise is
possible: • Loss of private key may be irreparable:
Conclusion
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