Asymmetric key

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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