Method and apparatus for detecting correctly decrypted communica

Details Method and apparatus for detecting correctly decrypted communica Method and apparatus for detecting correctly decrypted communica

1995-09-14

1996-07-30

Cain, David C.

Cryptography

Key management

Having particular key generator

380 48, H04L 900

Patent

active

055419976

ABSTRACT:
In a receiver (100), an encrypted communication (104) is decrypted using a decryptor (101) and a key (107) to produce a decrypted communication (105). A comparator (103) compares decrypted symbol patterns in the decrypted communication against a set of predetermined symbol patterns (108). When the decrypted symbol patterns are distributed non-uniformly relative to the set of predetermined symbol patterns, the receiver is identified as a target of the encrypted communication.

REFERENCES:
patent: 4440976 (1984-04-01), Bocci et al.
patent: 4610025 (1986-09-01), Blum et al.
patent: 4782529 (1988-11-01), Shima
patent: 5201000 (1993-04-01), Matyas et al.
patent: 5235644 (1993-08-01), Gupta et al.
"Identifying the Cipher Symbols of a Cryptogram from a Partially Incorrect Decryption"; IBM Technical Disclosure Bulletin; vol. 29 No. 3, 1986 Aug.
Chesson, Fredrick W; "Computer Cryptography--How to decipher Secret Messages"; Radio Electronics vol. 48, No. 12 Dec. 1977 pp. 48-50.

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