Cryptography – Cryptanalysis
Patent
1997-04-28
1999-11-16
Patel, Harshad
Cryptography
Cryptanalysis
380 23, 380 44, 380 28, H04L 900, H04K 100
Patent
active
059871245
ABSTRACT:
A system for encrypting a plaintext block using a block encryption algorithm having a block size smaller than that of the plaintext block. The plaintext block is transformed into a masked plaintext block using an invertible transformation optionally dependent on additional data and defined such that each bit of the masked plaintext block depends on every bit of the original plaintext block. A subportion of the masked plaintext block is encrypted using the encryption algorithm to generate an encrypted portion of the masked plaintext block. A ciphertext block is generated from the thus encrypted portion of the masked plaintext block and the remaining portion of the masked plaintext block. The ciphertext block is transmitted to a data recipient, who reverses the procedure to recover the original plaintext block. Since the entire masked plaintext block is necessary to reconstruct the original plaintext block and since the encrypted portion cannot be derived from the remaining portion, the remaining portion of the masked plaintext block may be transmitted to the recipient in unencrypted form. Two, three or four masking rounds are performed, depending on the location of secret data that is infeasible to exhaust and the location of the portion of the masked block that is encrypted.
REFERENCES:
patent: 5146500 (1992-09-01), Maurer
patent: 5159632 (1992-10-01), Crandall
patent: 5271061 (1993-12-01), Crandall
patent: 5272755 (1993-12-01), Miyaji et al.
patent: 5351297 (1994-09-01), Miyaji et al.
patent: 5425103 (1995-06-01), Shaw
patent: 5442707 (1995-08-01), Miyaji et al.
patent: 5619576 (1997-04-01), Shaw
patent: 5675653 (1997-10-01), Nelson, Jr.
Johnson, DB et al., "Hybrid Key Distribution Scheme Giving Key Record Recovery", vol. 37, No. 02A, Feb. 1994, pp. 5-16.
Koblitz, N, "Elliptic Curve Cryptosystems", Mathematics of Computation, vol. 48, No. 177, Jan. 1987, pp. 203-209.
Rivest, RL et al., "A Method for Obtaining Digital Signatures and Public-Key Cryptosystems", Communications of the ACM, vol. 21, No. 2, Feb. 1978, pp. 120-126.
Miller, VS, "Use of Elliptic Curves in Cryptography", Advances in Cryptology--Crypto '85, Lecture Notes in Computer Science, 218 (1986), Springer-Verlag, pp. 417-426.
Bellare, M et al., "Optimal Asymmetric Encryption", Advances in Cryptology--EUROCRYPT '94, Workshop on the Theory and Application of Cryptographic Techniques, Perugia, Italy, May 9-12, 1994 Proceedings, pp. 92-111.
Kaliski, Jr., BS, "A Standard Definition for Optimal Asymmetric Encryption Padding", RSA Laboratories, Redwood City, CA, Feb. 6, 1996--Second Draft, pp. 1-15.
Johnson Donald Byron
Matyas, Jr. Stephen Michael
Clark Robin
International Business Machines - Corporation
Kinnaman Jr. William A.
Patel Harshad
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