Multiplicative splits to protect cipher keys
US8675866B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2011 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | May 28, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In the field of computer enabled cryptography, such as a keyed block cipher having a plurality of rounds, the cipher is hardened against an attack by a protection process which obscures the round keys using the properties of group field automorphisms and applying masks to the states of the cipher, for encryption or decryption. This is especially advantageous in a “White Box” environment where an attacker has full access to the cipher algorithm, including the algorithm's internal state during its execution. This method and the associated computing apparatus are useful for protection against known attacks on “White Box” ciphers, by eliminating S-box operations, together with improved masking techniques and increasing the cipher's complexity against reverse engineering and key storage attacks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.