In some cases, at least in the technology used by government services in Spain, the hash result was in fact derived from the message and was unique only to the message, not to the private key.
在某些情形下，至少在西班牙政府部门使用的技术中，散列结果实际上是从电文中取得的，而且仅为电文而不为私钥所独有。