Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Reexamination Certificate
2005-02-24
2010-06-29
Shiferaw, Eleni A (Department: 2436)
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
C380S255000, C370S395200, C704S273000
Reexamination Certificate
active
07747013
ABSTRACT:
A system and method for providing early detection of encrypted signals within a secure connection for voice over Internet protocol (VoIP). The system and method includes a non-complex, in-band, and early encryption detector within the voice path. A transmitter sends out a known pattern. Based upon the received pattern, the receiver decides whether its encryption capabilities match up with those of the transmitter. If the capabilities do not match, then the receiver waits for the signalling message for the correct mode of operation. No packets are utilized until the receiver and transmitter encryption capabilities are matched.
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Deans Dennis
Dilkie Lee
Fullarton Sonya G
Patry Jean-Yves
Prodanovic Radovan
Mitel Networks Corporation
Shiferaw Eleni A
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