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PGP supports message authentication and integrity checking.The latter is used to detect whether a message has been altered since it was completed (the message integrity property) and the former to determine whether it was actually sent by the person or entity claimed to be the sender (a digital signature).Port Manteaux churns out silly new words when you feed it an idea or two.Enter a word (or two) above and you'll get back a bunch of portmanteaux created by jamming together words that are conceptually related to your inputs.
Everyone else will each choose their own trusted introducers.
Therefore, it is essential that partners in PGP communication understand each other's capabilities or at least agree on PGP settings. For this, PGP combines symmetric-key encryption and public-key encryption.
The message is encrypted using a symmetric encryption algorithm, which requires a symmetric key.
From its first release, PGP products have included an internal certificate 'vetting scheme' to assist with this, a trust model which has been called a web of trust.
A given public key (or more specifically, information binding a user name to a key) may be digitally signed by a third party user to attest to the association between someone (actually a user name) and the key.
Simply downloading a public key from somewhere is not an overwhelming assurance of that association; deliberate (or accidental) impersonation is possible.