CrypterRB is a freeware application made with REAL Studio which implements the RSA algorithm for public-key encryption.

Three windows in CrypterRB provide easy-to-use implementations of the RSA methods, they are titled GenKeys, Encode, and Decode.

1. GenKeys
This is the window to which you give the minimum bit length for modulus n, For good security this should be at least 2048 bits.

2. Encode
This is the window to which you give your clear text message, n, and e. The window then outputs an encrypted text as a base 36 number string.

3. Decode
This is the window to which you give the encrypted text, n, and d. The window then outputs the original clear text.

The license of this software is Freeware, you can free download and free use this file encryption software.