Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2007-05-01
2007-05-01
Barron, Jr., Gilberto (Department: 2132)
Cryptography
Communication system using cryptography
Time segment interchange
C380S259000, C380S044000
Reexamination Certificate
active
09920784
ABSTRACT:
Techniques for efficient KASUMI ciphering are disclosed. In one aspect, one KASUMI round for generating a fractional portion of the KASUMI cipher is deployed with appropriate feedback such that eight sequential rounds produce the KASUMI output. In another aspect, one third of the FO function is deployed with appropriate feedback such that three successive cycles produce the FO output. In yet another aspect, the FI function is deployed with appropriate feedback such that two subsequent cycles produce the FI output. In yet another aspect, a sub-key generator comprising two shift registers produces sub-keys for each round and sub-stage thereof in an efficient manner. These aspects, collectively, yield the advanced benefits of low area and low cost implementations of KASUMI with a simple user interface. Various other aspects of the invention are also presented.
REFERENCES:
patent: 5381480 (1995-01-01), Butter et al.
patent: 6314186 (2001-11-01), Lee et al.
patent: 0923062 (1999-06-01), None
Specification of the 3GPP Confidentiality and Integrity Algorithms, Document 2: KASUMI Specification, Version 1.0, 3GPP, Dec. 23, 1999.
Kuhn, U. “Cryptanalysis of reduced-round MISTY” Advances in Cryptology—Eurocrypt 2001, pp. 325-339.
3GPP Task Force “Specification of the 3GPP Confidentiality and Integrity Algorithms” ETSI/SAGE Specification, 1-24 (1999).
Averbuj Roberto Fabian
Dhawan Rajat Rajinderkumar
Mishra Pradeep Kumar
Barron Jr. Gilberto
Brown Charles D.
Pappas George C.
Qualcomm Incorporated
Rouse Thomas
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