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The purpose of authentication is to establish the identity of the peer, and the number of ways to do that is infinite. Any software that accomplishes that objective can be categorized as authantica...
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#1: Initial revision
The purpose of authentication is to establish the identity of the peer, and the number of ways to do that is infinite. Any software that accomplishes that objective can be categorized as authantication software. Your question is therefore ill-formed. But no competently written piece of software is ever going to receive a private key as input. Keys aren't private if they are communicated.