The following are tools to perform an RSA encryption.

## How to convert letters to numbers and numbers to letters (because RSA works on messages that are numbers).

We will do something fairly naive.

- Look at the public key n; choose a word that’s short enough so the following process will produce a number less than n.
- Put your word into the Boxentrique Letter to Number Converter to get it in ASCII (choose ASCII in Code Type, and don’t use spaces or carriage returns or punctuation; it will pick that all up). The result is a series of 3-digit numbers (if you get a 2-digit number, pad it with a zero, so A is 97, so make it 097).
- Concatenate the numbers to use as your message m (ignoring leading zeroes).
- For example, AM becomes 97109 and MA becomes 109097.

To undo, use the same process backward, using the Number to Letter Converter.