Tweakable encryption mode for memory encryption with protection against replay attacks
US8468365B2 · kind B2 · utility
8Cited by
1References
16Claims
0Family size
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Key dates
| Filing date | Sep 24, 2010 |
| Grant date | Jun 18, 2013 |
| Priority date | — |
| Expiry date | Aug 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/64
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for protecting against hardware attacks on system memory is provided. A mode of operation for block ciphers enhances the standard XTS-AES mode of operation to perform memory encryption by extending a tweak to include a “time stamp” indicator. An incrementing mechanism using the “time stamp” indicator generates a tweak which separates different contexts over different times such that the effect of “Type 2 replay attacks” is mitigated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.