Method and apparatus for detection of loss of cipher...

Details Method and apparatus for detection of loss of cipher... Method and apparatus for detection of loss of cipher...

2011-06-07

2011-06-07

Gee, Jason K (Department: 2434)

Cryptography

Communication system using cryptography

Symmetric key cryptography

Reexamination Certificate

active

07957531

ABSTRACT:
Detecting loss of stream cipher synchronization between a transmitter and a receiver in a video processing system may be achieved by receiving, by the receiver, an encrypted video frame from the transmitter, obtaining an encrypted value for a selected pixel in the encrypted video frame, decrypting the encrypted pixel value using a first portion of the receiver's current key stream, re-encrypting the pixel value using a second portion of the receiver's current key stream, sending the re-encrypted pixel value from the receiver to the transmitter, obtaining, by the transmitter, a plaintext value for the selected pixel from a corresponding original video frame and encrypting the plaintext pixel value using a second portion of the transmitter's current key stream, and comparing the re-encrypted pixel value received from the receiver with the encrypted pixel value generated by the transmitter and detecting a loss of cipher synchronization when the values do not match.

REFERENCES:
patent: 5546464 (1996-08-01), Raith et al.
patent: 6944299 (2005-09-01), Mallela et al.
patent: 7058178 (2006-06-01), Jansen et al.
patent: 7110546 (2006-09-01), Staring
patent: 7151832 (2006-12-01), Fetkovich et al.
Heys, Howard, “An Analysis of the Statistical Self-Synchronization of Stream Cyphers”, 2001.

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