Bitcoin also hashes twice, i.e. it computes sha256(sha256(.)). Supposedly, this ... | Hacker News

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ecesena on Dec 17, 2017 | parent | context | favorite | on: Show HN: An educational blockchain implementation ...

Bitcoin also hashes twice, i.e. it computes sha256(sha256(.)). Supposedly, this is to protect against extension attacks [1].

Was wondering, any specific reason to choose RSA vs ECDSA? Signatures would be smaller.

[1] https://en.wikipedia.org/wiki/Length_extension_attack

jre on Dec 17, 2017 [–]

No good reason for RSA vs ECDSA. I was just more familiar with RSA, but apparently pycryptodome supports ECDSA as well, so I guess the change should be minimal.

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