Nemesis was my very first cryptographic tool written in Java.
Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that decryption becomes the job of the person to decrypt via sight reading.
One of the best-known techniques has been credited to Moni Naor and Adi Shamir, who developed it in 1994.
They demonstrated a visual secret sharing scheme, where an image was broken up into n shares so that only someone with all n shares could decrypt the image, while any n − 1 shares revealed no information about the original image.
Naor, M. and A. Shamir. Visual cryptography, Advances in cryptology. Eurocrypt ’94 Proceeding LNCS, 950:1–12, 1995.
Windows Phone App Shelfy
Shelfy was an app made in .NET for Windows Phone 8.1 with some pretty cool features like scanning ability (ISBN code), fetching book data from web databases and much more.