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Android Privacy Guard (APG) is a free and open source application for Android devices, created by Thialfiar, that lets you encrypt and decrypt single files or emails. It aims provide OpenPGP encryption for Android devices, although not all features of OpenPGP are implemented yet. Its public/private key scheme lets you encrypt, decrypt and sign files and messages. You can also use it without any public/private key pair to encrypt single files with asymmetric encryption, securing the files with a password or passphrase. For email encryption we recommend to use it in combination with K9, an Android email client, for which there is also a Hands on Guide.
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