Electrical computers and digital processing systems: support – Multiple computer communication using cryptography
Reexamination Certificate
2003-08-12
2008-12-30
Vu, KimYen (Department: 2135)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
C713S171000, C380S259000, C380S277000, C380S278000, C705S071000, C379S090010, C379S093010
Reexamination Certificate
active
07472268
ABSTRACT:
A system is provided for cycling encryption keys to prevent the guessing of encrypted presence information in a shared information space. The system of the invention prevents malicious publication of presence information and ensures that only valid presence information is published to the shared information space. A malicious subscriber is prevented from knowing that he/she has been detected while a search is underway to determine his/her identity. During such a search, authorized subscribers are shifted to a new source of presence information while the malicious subscriber remains at the previous source.
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Vu Kim-Yen
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