TAILIEUCHUNG - Using Modern Symmetric Key Ciphers

USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. Error Propagation A single bit error in transmission can create errors in several in the corresponding block. | Le Trong Ngoc letrongngoc@ Using Modern Symmetric-Key Ciphers 1 USING MODERN CIPHERS 1 USE OF MODERN BLOCK CIPHERS 2 USE OF MODERN STREAM CIPHERS 1 USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. 1 USE OF MODERN BLOCK CIPHERS Electronic codebook (ECB) mode Error Propagation A single bit error in transmission can create errors in several in the corresponding block. However, the error does not have any effect on the other blocks. 1 USE OF MODERN BLOCK CIPHERS Ciphertext Stealing A technique called ciphertext stealing (CTS) can make it possible to use ECB mode without padding. In this technique the last two plaintext blocks, PN−1 and PN , are encrypted differently and out of order, as shown below, assuming that PN−1 has n bits and PN has m bits, where m ≤ n . 1 USE OF MODERN BLOCK CIPHERS Cipher block chaining (CBC) mode Error .

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• Lecture Cryptography and network security
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• Symmetric key Ciphers
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• International Journal of Computer Networks and Communications Security
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