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In contrast with PKC, the security of symmetric cryptography is not significantly impacted by quantum computers, and existing symmetric algorithms with at least 128-bit keys (such as AES) can continue to be used. The security of hash functions such as SHA-256 is also not significantly affected, and secure hash functions can also continue to be used.

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In contrast with PKC, the security of symmetric cryptography is not significantly impacted by quantum computers, and existing symmetric algorithms with at least 128-bit keys (such as AES) can continue to be used. The security of hash functions such as SHA-256 is also not significantly affected, and secure hash functions can also continue to be used.
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Filippo Valsorda :go: (filippo@abyssdomain.expert)'s status on Saturday, 18-Nov-2023 09:51:37 JST Filippo Valsorda :go:

Here's the UK Government stating—like NIST did—that 128 bit keys are enough against quantum computers. No need to migrate to 256 "because quantum".
https://www.ncsc.gov.uk/whitepaper/next-steps-preparing-for-post-quantum-cryptography#section_4

In conversation about a year ago from abyssdomain.expert permalink