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A method is disclosed for block ciphering using block chaining with ciphertext feedback which introduces a noise component into the plaintext before encipherment to enhance the cryptographic operation.
English (United States)
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Initializing Vector Operation on Plaintext
A method is disclosed for block ciphering using block chaining with
ciphertext feedback which introduces a noise component into the plaintext before
encipherment to enhance the cryptographic operation.
Block ciphering is a process by which each n bit input block of plaintext X is
enciphered under control of a cipher key K by a cipher function f into a
corresponding n bit output block of ciphertext Y. By an inverse cipher function f/-
1/, each block of ciphertext Y is deciphered under control of the same cipher key
K into the corresponding original block of plaintext X. The block
enciphering/deciphering operations may be expressed as Y=f(K)X and X=f(K)/-
1/Y, respectively. Block chaining with ciphertext feedback is one form of block
ciphering, described in U.S. Patent 4,078,152, where each input block of
plaintext, except the first, is modified, by exclusive ORing it with the ciphertext
resulting from the preceding cipher operation, before it is presented for
encipherment. The term chaining refers to the feedback between the preceding
ciphertext and the present plaintext, with the first data block being modified by an
initializing value See Original. Enciphering/deciphering operations by this
technique can be expressed as: See Original.
It should be noted that the first ciphertext block is a function of the initializing
vector See Original. To enhance the cryptographic operation for succeeding
ciphertext blocks, the initi...