The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2000
Filed:
Dec. 11, 1996
John R Douceur, Bellevue, WA (US);
Michael P Calligaro, Bellevue, WA (US);
Matthew W Thomlinson, Bellevue, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A protocol is provided for transmitting low security messages and high security messages with one-time-pad cryptosystem. In one implementation of the present invention, low security messages are encrypted using random bit strings in accordance with a one-time-pad encryption scheme. A high security message and a decoy message are embedded within a set of encryption keys and cyphertexts that is to be transmitted from a sender to a receiver. The encryption keys are transmitted over a secure channel from the sender to the receiver, and the cyphertexts are transmitted over a publicly accessible channel from the sender to the receiver. The receiver uses the encryption keys and knowledge regarding keys for a high security message and a decoy message to decrypt the low security messages, extract the high security message and/or decoy message, and decrypt the high security message and/or decoy message. The provision of the decoy message is revealed when duress is applied to coerce the receiver into revealing the key for a supposedly high security message.