In the real world, AES has hardware acceleration (AES-NI) that makes it very fast while being immune to cache-timing attacks.
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Meanwhile, they're not actually making optimal security choices, and may in fact be hurting their own security. They choose the largest possible keys that meet their target benchmarks and feel safer in doing so. Many people in the security industry focus entirely on maximizing the difficulty of a brute force attack, provided they can still achieve their performance goals. The most important thing to keep in mind about cryptographic key sizes in 2019 is they don't matter nearly as much as the general public likes to think. An Important Note About Cryptographic Key Sizes Additionally, many of them are showing their age and desperately need to be brought up to speed with a modern understanding of real world cryptography.
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Lenstra's equation) and various standard committees ( ECRYPT-CSA, Germany's BSI, America's NIST, etc.) over the years.ĭespite the abundance of coverage on this material on the Internet, these resources lack the clarity that we look for when drafting recommendations for software developers and system administrators. A lot has been written about cryptography key lengths from academics (e.g.