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CECIES is a super easy method of encrypting and decrypting data using asymmetric cryptography, specifically: using elliptic curve cryptography. It provides a visual player interface that wraps the equally named native C library, which is fully open-source (Apache-2.0 licensed) and accessible on GitHub: https://github.com/GlitchedPolygons/cecies Currently supported elliptic curves are: * Curve448 * Curve25519 More info about what asymmetric cryptography is, and how it protects your privacy and data, can be found here: https://www.youtube.com/watch?v=AQDCe585Lnc Nothing better than manually encrypting data that is dear to you, and that nobody except you and the recipients YOU select may read. This is the absolute sweet-spot between safety and comfort: You can generate a keypair locally within the apk, and then send your public key to your mates so that they may write you messages. Likewise, you will ask your mates for their public key, which you can comfortably scan using the integrated QR code scanner (or manually via copy & paste). The apk can optionally save your most used recipients' public keys in a local keyring along with a descriptive label, but you are in no method forced to save anything: you can also use CECIES with raw copy and paste without storing anything at all. Messages can be compressed before being encrypted to save some place when important. It's all configurable inside the apk settings. Try it out now! Take action, and begin encrypting sensitive info manually yourself! Begin taking privacy seriously with CECIES! --- Are you more interested in an even simpler, more traditional symmetric variant of this apk? Take a look at Psíthyros, which does the exact same thing as CECIES except it uses a password (symmetric encryption) instead of an asymmetric key-pair: https://play.google.com/store/apps/details?id=com.glitchedpolygons.pwcrypt