Binary Affine Crypto System using MATLAB

• Durum: Closed
• Ödül: $20
• Alınan Girdiler: 1
• Kazanan: bxh323

Winner

Yarışma Özeti

This is a simple implementation in MATLAB.
You are to implement in matlab to encrypt, decrypt, and attack the following crypto (using the Binary Affine Crypto System):

Yi = (aXi + b) % 256
Xi = (a-1Yi - a-1b) % 256

Where {Xi , i = 1 : n } is the input plain bytes sequence, {Yi, i = 1 : n} is the output cipher byte sequence, and a, b are the key bytes selected from {0, 1, 2, ….255}. Please notice that a must be invertible in Z256

To test your routines, you need to encrypt a jpg image file and decrypt the resulting file. The implementation should be able to decrypt without explicitly mentioning a and b that are used for encrypting.

The provider with the fast and best solution will be awarded. More work to follow based on this submission.

Tavsiye Edilen Beceriler

• Matlab ve Mathematica
• Yazılım Mimarisi