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PGP is short for "Pretty Good Privacy". It is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication. PGP is often used for signing, encrypting and decrypting texts, E-mails, files, directories and whole disk partitions to increase the security of e-mail communications.

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Is PGP for user authentication a good idea?

You should never try to secure a "real" web application with a scheme that you invented on your own. As such we shouldn't discuss practicalities on how you would actually implement or use such a metho …
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