TAILIEUCHUNG - Hacker Professional Ebook part 170

Tham khảo tài liệu 'hacker professional ebook part 170', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | deciphering the message data. Alternately the random value itself may be sent unenciphered but is then enciphered or hashed under a keyed cryptographic hash to produce a value used as the data ciphering key. The message key assures that the actual data is ciphered under a key which is an arbitrary selection from a huge number of possible keys it therefore prevents weakness due to user key selection. A message key is used exactly once no matter how many times the same message is enciphered so at most a successful attack on a message key exposes just one message. The internal construction of a random message key cannot be controlled by a user and thus prevents all attacks based on repeated ciphering under a single key. To the extent that the message key value really is random and is never exposed on either end the message key is much more easily protected than ordinary text see ideal secrecy . In a sense a message key is the higher-level concept of an IV which is necessarily distinct for each particular design. MITM Man In The Middle. Mixing The act of transforming multiple input values into one or more output values such that changing any input value will change the output value. There is no implication that the result must be balanced but effective mixing may need to be in some sense complete. Also see Mixing Cipher combiner Latin square combiner and Balanced Block Mixing. Mixing Cipher A block cipher based on Balanced Block Mixing of small elements in FFT-like or FWT-like mixing patterns. Below we have a toy 32-bit-block Mixing Cipher. Plaintext at the top is transformed into ciphertext at the bottom. Each S is an 8-bit substitution table and each table and now each mixing operation also is individually keyed. Horizontal lines connect elements which are to be mixed together Each --- represents a single Balanced Block Mixing or BBM. Each BBM takes two elements mixes them and returns two mixed values. The mixed results then replace the original values in the .

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