You’ll know if you’re using PGP, because the entire premise of the program is based around using public and private keys —huge strings of text—to encrypt and decrypt messages.

It is also possible to decrypt emails with PGP decryption tools separate from email programs.

The flaw occurs in the way PGP handles long file names in encrypted archives, Network Associates said on its site. PGP runs into problems when it tries to encrypt or decrypt files that have names ...

Decade-old Efail flaws can leak plaintext of PGP- and S/MIME-encrypted emails Researchers explain the attack behind their warning to disable email plugins for now.