Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2001-02-15
2009-12-01
Barron, Jr., Gilberto (Department: 2432)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S274000
Reexamination Certificate
active
07627121
ABSTRACT:
An apparatus, system and method provides an out-of-synchronization detection by using a network layer checksum. A process operating at an upper layer verifies that a checksum embedded in a network layer header is correct before encrypting and transmitting a data packet containing the header and a payload. The data packet is received through a wireless communication channel at a receiver and decrypted. A calculated checksum is calculated on the received payload at the receiver and compared to the received checksum embedded in the header. A key stream used at the receiver for decrypting the received encrypted data packets is determined to be out of synchronization with a key stream used at the transmitter to encrypt the data packets if the calculated checksum is not equal to the network layer checksum.
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Reeds, III James Alexander
Ying Wen-Ping
AT&T Mobility II LLC
Barron Jr. Gilberto
Dinh Minh
Moazzam & Associates, LLC
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