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    • 3. 发明公开
    • DYNAMIC MASKING
    • EP3499788A1
    • 2019-06-19
    • EP17306790.1
    • 2017-12-15
    • Secure-IC SAS
    • LOZAC'H, FlorentGUILLEY, Sylvain
    • H04L9/06H04L9/00
    • There is disclosed a circuit comprising a cipher accessing a plurality of read-write memory units configured to handle data tables obtained from a modified mask (620); wherein the modified mask (620) is being determined from an initial mask (610) and a random value (611), the random value (611) selecting one or more modifications of the initial mask (610) amongst a plurality of predefined modifications including permutation operations (6111). Developments of the invention describe the use of mathematically optimal or equivalent masks; the use of random values; a range of permutation operations comprising offset shifting and/or rotation and/or XOR operations and/or coprime construction; the use of round masks; the use of a Physically Unclonable Function; the refresh or update of modified masks and/or round masks; and verifications of the optimality and/or integrity of masks. System features (e.g. CPU, co-processor, local and/or remotely accessed external memory storing masks, volatile memory) and computer program products are described.