crypto Importent notes

DES

• Symittric key cryptography
• key-64 bit/128 bit
• block- 64 bit
• key 56 bit key lenght.
• replace by AES
• has 4x16 ‘s’ block
• Double DES- Meet in middle attack prone.
• Triple Des- 56x3=168 bit key size
• {both double and riple DES ueses 2 keys while encrypt/decrypt}

AES

• key- 128/192/256 bit
• block size 128 bit
• uses feistal cipher

Message Digest

• MD5,MD4-1, SHA-1 SHA-0/1/2 are
• MD5 —>