Precomputing internal AES states in counter mode to protect keys used in AES computations
US9264222B2 · kind B2 · utility
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11References
20Claims
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Key dates
| Filing date | Aug 30, 2013 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | Oct 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods, media, and systems for, in one embodiment, protecting one or more keys in an encryption and/or decryption process can use precomputed values in the process such that at least a portion of the one or more keys is not used or exposed in the process. In one example of a method, internal states of an AES encryption process are saved for use in a counter mode stream cipher operation in which the key used in the AES encryption process is not exposed or used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.