Cryptography – Key management – Having particular key generator
Patent
1996-01-29
1998-09-08
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 21, H04L 912
Patent
active
058057056
ABSTRACT:
To enhance the security provided by data encryption in a data communication network, the encryption/decryption keys are changed periodically at the source and destination nodes for an established connection. A destination node must know not only the value of any new key but also when to begin using that key to decrypt received data packets. Synchronization (making sure a data packet is decrypted using a decryption key correlated with the encryption key used to encrypt the same packet) is achieved by defining a single bit in each packet header as a key synchronization bit. As long as key synchronization bit value remains unchanged from one received packet to the next, a receiving node will continue to use the same decryption key it has been using. When a change in the key synchronization bit value is detected, the receiving node will begin using a previously-received, new decryption key.
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Gray James P.
Onvural Raif O.
Peyravian Mohammad
Cangialosi Salvatore
International Business Machines - Corporation
Woods Gerald R.
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