tailieunhanh - Cryptography and Network Security Block Cipher

Impersonation can come about from packet spoofing and replay attacks. Spoofing attacks involve providing false information about a principal’s identity to obtain unauthorized access to systems and their services. A replay attack can be a kind of spoofing attack because messages are recorded and later sent again, usually to exploit flaws in authenti- cation schemes. Both spoofing and replay attacks are usually a result of information gained from eavesdropping. Many packet-snooping programs also have packet-generating capabilities that can capture data packets and then later replay them | Cryptography and Network Security Block Cipher Xiang-Yang Li CS595-Cryptography and Network Security Modern Private Key Ciphers Stream ciphers 0 The most famous Vernam cipher 0 Invented by Vernam AT T in 1917 0 Process the message bit by bit as a stream 0 Also known as the one-time pad 0 Simply add bits of message to random key bits CS595-Cryptography and Network Security Cont Key Ciphertext Plaintext CS595-Cryptography and Network .

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