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Putty vulnerability: bias in ECDSA deterministic nonce generation leads to compromise of NIST P521 keys with ~60 signatures

https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html

writeup from the researcher who discovered this: https://www.openwall.com/lists/oss-security/2024/04/15/6

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