Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2011-05-24
2011-05-24
Korzuch, William (Department: 2431)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S168000, C713S170000, C726S001000, C726S026000, C709S204000, C709S205000, C709S206000, C709S227000
Reexamination Certificate
active
07949873
ABSTRACT:
Secure instant messaging is described. In an embodiment, a messaging device encrypts a challenge identifier to generate an encrypted challenge message, and communicates the encrypted challenge message via a peer-to-peer communication link to a recipient messaging device. The recipient messaging device decrypts the encrypted challenge message and encrypts the challenge identifier as a return challenge identifier to generate an encrypted challenge return. The messaging device receives the encrypted challenge return from the recipient messaging device, decrypts the encrypted challenge return, and verifies that the return challenge identifier matches the challenge identifier to establish that communications are secure when communicated via the peer-to-peer communication link and, optionally, to establish control policies pertaining to a communication received at the recipient messaging device.
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Ford Peter S.
Holmes John S
Schwartz Eyal
Korzuch William
Lee & Hayes PLLC
Microsoft Corporation
Su Sarah
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