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There are several levels of confidence which can be included in such signatures.Although many programs read and write this information, few (if any) include this level of certification when calculating whether to trust a key.Pretty Good Privacy (PGP) is an encryption program that provides cryptographic privacy and authentication for data communication.PGP is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications. PGP encryption uses a serial combination of hashing, data compression, symmetric-key cryptography, and finally public-key cryptography; each step uses one of several supported algorithms.Each symmetric key is used only once and is also called a session key.The message and its session key are sent to the receiver.The session key must be sent to the receiver so they know how to decrypt the message, but to protect it during transmission it is encrypted with the receiver's public key.
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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.
From its first version, PGP has always included provisions for distributing user's public keys in an 'identity certificate', which is also constructed cryptographically so that any tampering (or accidental garble) is readily detectable.