Digital signatures rely on public key cryptography.
数字签名依赖于公共密钥加密学。
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This allows for a more-reasonable search space for matching key-hold time signatures.
这将允许在匹配按键时间签名时获得更合理的搜索空间。
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Certificate: a public key with some information attached about the identity of its owner and, optionally, the signatures of third parties confirming this identity.