Encryption and decryption methods using bit-length preservation

Details Encryption and decryption methods using bit-length preservation Encryption and decryption methods using bit-length preservation

1989-04-26

1991-11-26

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

380 9, 380 30, 380 49, H04L 928

Patent

active

050688952

ABSTRACT:
An encrypting method for producing a code which cannot be deciphered by an eavesdropper. The encrypting method does not require the bit length of input information to be increased when the information is converted into a cryptogram. The encrypting method uses a prior art encryptor and decryptor when it determines that the input information is small enough to not overrun the bit length when encrypted, and a bit-length preservation encryptor and decryptor when the input information will overrun the bit length when encrypted.

REFERENCES:
patent: 4078152 (1978-03-01), Tuckermann, III
patent: 4752953 (1988-06-01), Paik et al.
patent: 4896353 (1990-01-01), Dehgani et al.
Rivest et al., "A Method for Obtaining Digital Signatures and Public-Key Cryptosystems", Comm. ACM, vol. 21, No. 2, pp. 120-126, 2/78.
Tanaka et al., "On Modular Exponentiation Using a Signal Processor", 1987 Nat'l. Conference of the Institute of Electronic Data Communications Engineers of Japan, Treatises, No. 15.
Tanaka et al., "Realization of RSA Cryptosystem Using Digital Signal Processor", 1988 Nat'l. Conference of the Institute of Electronic Data Communications Engineers of Japan, Treatises, No. A-298.

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