Cardan grille

If you are sharing important information with others on the internet and want to keep it away from prying eyes, you have the option of encrypting your messages using one of the numerous available algorithms.
The classic Cardan grille method relies on a sheet of paper or thin metal with multiple rectangular cutouts that reveal a hidden message when placed over a large body of text. It has seen widespread use throughout history, and this application allows you to take advantage of the same encryption algorithm on your PC.

Nifty application that demonstrates the process and can encrypt messages

The program is very easy to use, as you only need to insert the source text and define the size of the grille. A short animation illustrates the operation, and you are then provided with the cryptogram and the decryption key.
Of course, you can copy the generated encryption key and offer it to anyone who wishes to decrypt your message.
The utility is in no way complex, and it also comes with a decent amount of documentation that provides more detailed explanations.

Lightweight and fully portable utility

Cardan grille is a very small application and can be deployed in no time at all, as it is not necessary to install it on you PC beforehand.
Moreover, you can carry it on a USB drive and launch it instantly on any computer that meets the listed requirements.

Useful application that would benefit from an alternative operating mode

While watching the encryption process is certainly interesting, it would be nice if you had the option of disabling the illustration altogether. However, it is possible to increase the animation speed until the operation is performed almost instantly.
Overall, Cardan grille is a simple program that enables you to encrypt text and decode cryptograms with the help of a decryption key. It is fully portable and also displays an animation that demonstrates the process while it encrypts your messages.