This chapter will introduce you to some basic concepts behind mail encryption. It is important to read to get some feeling of how mail encryption actually works and what its caveats and limitations are. PGP (Pretty Good Privacy) is the protocol we shall use for e-mail encryption. This protocol allows us to digitally sign and encrypt mail messages. It works on an end-to-end basis: messages will be encrypted on your own computer and will only be decrypted by the recipient of the message. There is no possibility for a ‘man-in-the-middle’ to decipher the contents of your encrypted message. This excludes the subject lines and the ‘from’ and ‘to’ addresses, which unfortunately are not encrypted in this protocol.
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