Digital signature employ asymmetric cryptography, meaning there are not one but two keys involved: a public key and a private key. As their names imply, the private key must be kept secret and the public key is shared with the recipients. The private key is used by the sender to sign messages, and the public key is then used by the recipients to verify the signature is correct.

If an attacker wanted to forge a signature for a particular message, they would not be able to do so without knowing the sender's private key, but they may be able to fool recipients into accepting a new public key. Thus, as a recipient, it is important to understand the significance of trusting a public key.
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