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In ECDSA, both signature(r,s) and (r,-s) are valid. However, in Bitcoin, it seems that the signature fails to be verified when s-part in the signature is bigger than half of the group order from this post https://bitcoin.stackexchange.com/questions/85946/low-s-value-in-bitcoin-signature I am wondering that if Ethereum is the same as Bitcoin. If yes, what is the reason that s needs to be a low-value?

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Ethereum has had this requirement since the homestead hard fork. This requirement was introduced as part of EIP-2 (see point 2 of https://github.com/ethereum/EIPs/blob/master/EIPS/eip-2.md#specification)

Rather than me repeat what others have already answered, here is an answer which explains concisely why the low s requirement is needed: https://bitcoin.stackexchange.com/a/38253

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  • thanks! it's helpful.
    – tyyen
    May 10 '19 at 6:19
  • Could you mark it as the answer if you're happy with it? Thanks @tyyen
    – Zekik64
    May 13 '19 at 8:36

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