Android app to communication secure notes

Hi All,

I recently created an app called Celatum. It also allows you to add trusted contacts using public key cryptography. Encrypted notes can be sent to these contacts in a jiffy. GMail is the preferred channel for communication.

AES 256 bit session keys are used for notes in transition which means that there is no single key to encrypt notes in transit. Also, public key cryptography (RSA 2048 bit) and digital signatures (SHA-256) ensure that only your contacts can see the notes.

Looking for reviews from users. Ideas and feature are also welcome.

The app is here on Google Play. App name is Celatum.
https://play.google.com/store/search?q=pub:Harisankar Krishna Swamy

Best,
Hari