Cryptography – Particular algorithmic function encoding
Patent
1995-01-18
1996-07-02
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
380 46, 380 47, 380 49, H04L 928, H04L 900
Patent
active
055331289
ABSTRACT:
In a pseudo-random transposition cipher system and method, sender and receiver each have sets of corresponding identical pseudo-random number generators. To encrypt a message, the sender generates a pseudo-random initializing integer, transmitted along with the encrypted message. The sender, using a key secretly shared with the receiver, selects a set of seed integers for the pseudo-random number generators from the initializing integer. The first number generator produces a set of numerical synonyms (numerical codings) associated one-to-one with a set of sequentially indexed addresses of cardinality at least as great as that of the plaintext alphabet. The second number generator determines a one-to-one mapping of the plaintext alphabet into the set of addresses. Whenever a plaintext alphabet character appears in the message, the numerical synonym sharing the same address is used as the corresponding ciphertext character. After use of a plaintext character, a third number generator locates a new address so that the numerical synonym residing there can be transposed with the one last used for, and at the address of, the plaintext character. To decrypt, the receiver uses the secret key and initializing integer to recover the pseudo-random number generator seeds and undoes the encrypting process described above.
REFERENCES:
patent: 5113444 (1992-05-01), Vobach
patent: 5193115 (1993-03-01), Vobach
patent: 5307412 (1994-04-01), Vobach
patent: 5335280 (1994-08-01), Vobach
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