System and method for efficient and semantically secure symmetric encryption over channels with limited bandwidth
US9929863B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2015 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Feb 1, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a system for enhancing security in a secure communication channel. During operation, the system collects contextual information associated with a mobile device or a user of the mobile device and determines whether a trigger condition is met based on the collected contextual information. In response to determining that the trigger condition is met, the system performs a first type of key-ratcheting operation on a current cryptographic key to update the cryptographic key. In response to determining that the trigger condition is not met, the system performs a second type of key-ratcheting operation on the current cryptographic 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.