# CrypTool RSA Features [duplicate]

I am attempting to manually encrypt a plaintext message (message = MI) using RSA.

When I enter the same plaintext into CrypTool to confirm that my calculations were correct, I receive a different answer:

What am I doing incorrect? How can I obtain the same result as CrypTool?

• I checked it with version 1.4.42: When using the default setting of CrypTool 1 it works well and shows the results you expected. This fits with the answer of Peregrinus.
– Yves
Jan 20 at 14:15

Emphasis mine. It's not encrypting one character at a time, it's encoding "MI" to the number $$360$$, then computing $$360^{11}\mod40741=11807$$. It's doing this because you changed some of the "Alphabet and number system options..." settings.