Coercion resistant one-time-pad cryptosystem that facilitates transmission of messages having different levels of security
US6021203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0656
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.