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专利名称：SYSTEM AND METHOD FOR EFFICIENT AND
SEMANTICALLY SECURE SYMMETRICENCRYPTION OVER CHANNELS WITHLIMITED BANDWIDTH
发明人：Julien F. Freudiger,Ersin Uzun申请号：US149214申请日：20151030
公开号：US201701209A1公开日：20170504
专利附图：
摘要：One embodiment of the present invention provides a system for enhancing
security in a secure communication channel. During operation, the system collectscontextual information associated with a mobile device or a user of the mobile device anddetermines whether a trigger condition is met based on the collected contextualinformation. In response to determining that the trigger condition is met, the systemperforms a first type of key-ratcheting operation on a current cryptographic key toupdate the cryptographic key. In response to determining that the trigger condition isnot met, the system performs a second type of key-ratcheting operation on the currentcryptographic key to update the cryptographic key. The system then encrypts a to-be-sent message using an encryption key associated with the updated cryptographic key.
申请人：Palo Alto Research Center Incorporated
地址：Palo Alto CA US
国籍：US
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