Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2007-08-07
2007-08-07
Barron, Gilberto (Department: 2134)
Cryptography
Communication system using cryptography
Time segment interchange
C380S043000
Reexamination Certificate
active
09782860
ABSTRACT:
A method and system of alternatively selecting an encryption key used to transmit a known number data bits and providing sufficient information to inform the receiving part of the selected encryption key is presented. In one embodiment of the invention, a plurality of encryption keys are available to the parties of the communication network. The transmitting party selects an encryption key used to encrypt a message block based on the data content of a previously transmitted message block. The receiving party, having received, and decrypted, a previously transmitted message block has sufficient information to determine the encryption key used to encrypt a subsequent data block and is able to decrypt the subsequently transmitted message.
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DiSanto Frank J.
Krusos Denis A.
Barron Gilberto
Copytele Inc.
Nalven Andrew L.
Plevy Howard & Darcy PC
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