Cryptography and high security keystore Android application tool. It has a very useful floating tool and ball/bubble mode. It is only about 2 MB. It does not ask for permissions or do anything weird.

It has been developed keeping in mind these three words: fast small and offline.

Encryption AES and Hash SHA-256:
- Easy encryption and hash computation of any text in any place and situation.
Keystore:
- Keep your keys away these fancy services that does not show the source code and send data all the time to the cloud.

The application is free software (GPLv3) you can follow its development in:
https://github.com/nfdz/Cryptool