11/2/2023 0 Comments Quick cpu 64 bit![]() ![]() ![]() On a 64 bit CPU, the 64 bit variants are faster than the 32 bit variants. On a 32 bit CPU, the 32 bit variants are faster than the 64 bit variants. All the variants can be computed on both 32 and 64 bit CPUS. For example the SHA2 algorithm can work with either 32 bit words (SHA-224 and SHA-256) or 64 bit words (all the other SHA2 variants). Symmetric algorithms, which don't work with large numbers but rather with multiple variables each sized conveniently for machine words, things may be different. ![]() But being able to process 64 bits at a time rather than 32 means you can reduce the number of instructions needed by a factor of 2-4. For those, the computation have to be split up and processed in smaller parts. Those algorithms which do rely on large numbers, need numbers much larger than 64 bits. 64 bits is too short for modern cryptographic algorithms. Saying that the large numbers you can handle with 64 bits allow for better encryption is misleading. ![]()
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