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Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.
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I don't have pgp cli any more (I went to gpg ages ago) but seem to recall -v (verbose) mode on the decrypt gave more info on what it was trying to use to decrypt? the message implies that you have one or more of the public keys encrypted to, but not the private key required to decrypt