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Given that the link to the Kudelski analysis does not work anymore, please find an updated link here. Hopefully, that addresses your concerns about the answer's legitimacy. To be more precise, regarding the OP's question, using currently standardized key sizes, AES is most secure with 256-bit keys and the suggested modifications to its key schedule. The ...


Regarding using AES in the most secure way possible against quantum computers AND related key attacks (while keeping hardware compatibility with existing CPU cryptographic optimizations), I would suggest you to read (Towards post-quantum symmetric cryptography). At the time of the question we hadn't yet written a formal ...

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