Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2006-02-21
2006-02-21
Song, Hosuk (Department: 2135)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S255000
Reexamination Certificate
active
07003114
ABSTRACT:
A method and apparatus for achieving crypto-syncronization in a packet data communication system employing cryptographic communications. In a transmitter, a state vector is incremented at a predetermined rate and is provided to an encryption module. The encryption module uses the state vector to sequentially encrypt the data frames. During periods of frame dropping prior to encryption, the state vector is disabled, thereby allowing for sequential encryption of the data frames. In a receiver, during a frame dropping condition, the state vector is advanced in proportion to the number of frames dropped. During an underflow condition at the receiver, the state vector is disabled for the duration of the underflow condition, and enabled once the underflow condition has passed.
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Stevens Richard W. 1994. TCP/IP Illustrated vol. 1, The Protocols. Addison-Wesley. vol. 1. pp. 285-286 and 310-311.
Katbab Abdollah
Minhas Micky S.
Qualcomm Incorporated
Song Hosuk
Wadsworth Phil
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