Oversec transparently encrypts and decryptsany text in any app
You can use it to exchange private encrypted and covert chat- oremail messages or store your own encrypted notes on yourphone.
See our demo videos:
Oversec is completely agnostic of the subjacent app, it works withWhatsapp™, Line™, Snapchat™, Instagram™ or any other chat app. Italso supports sending and receiving PGP encrypted messages with theGmail™ or any other Email app.
End-to-End Encryption was yesterday. Oversec introduces”Eye-to-Eye” encryption. Encrypted data is only decrypted whileit is shown on the screen! No clear text is ever persisted andthus cannot be extracted from the file system or accidentally bebacked up into the cloud.
We also carefully designed Oversec so that it doesn’t requireinternet access. Because of that, you can rest assured that nodecrypted information can ever leave your device.
How it works:
Oversec constantly monitors the text on your screen. When it findsan encrypted text, it tries to decrypt it and then shows thedecrypted text as an overlay in place of the encrypted text.Conversely, it can read text out of an input field, encrypt it, andthen put the encrypted text back into the input field.
In order to encrypt a text, Oversec shows a button next to anactive input field. After having entered the secret text, tappingthat button makes Oversec read the text, encrypt it and put backthe encrypted text into the field. It is now ready to be sent inthe subjacent app as usual – the app doesn’t even know that it issending encrypted data!
Oversec also features a unique way of encoding the encryptedmessages. It stores the encrypted text in invisible (zero-width)characters and let’s you add decoy text at the end. That way, amessage will just show e.g. “The sun is shining!” with no visiblesign of any encryption, whereas in reality it contains a hiddenencrypted message.
You may also encrypt and send photos through Oversec – its uniquecamera mode even allows you to take and send an encrypted photowithout ever storing the original photo on the device.
Oversec encrypts your data either using symmetric keys (usingChaCha20 cipher + Poly1305 MAC ) or using asymmetric PGP encryption(making use of the OpenKeychain app[https://www.google.com/url?q=https://play.google.com/store/apps/details?id=org.sufficientlysecure.keychain]).
The encryption related code is open source and can be found here:https://github.com/oversecio/oversec_crypto
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