Patent Number: 8,817,976

Title: Reversible cipher

Abstract: A cipher device having a number of data bits in an input register corresponding to a data unit element, a sudoku filter coupled with the input register, and a data selector coupled with the sudoku filter and the input register. A fob cipher device has a FPGA programmed to perform encrypting of a plaintext with a transposed Sudoku to form a first ciphertext and encrypting the first ciphertext with pseudorandom mixing bits to form a second ciphertext. A reversible encryption method includes encrypting plaintext with a transposed Sudoku forming a first ciphertext, encrypting the first ciphertext with pseudorandom mixing bits forming a second ciphertext, and outputting the plaintext-corresponding second ciphertext.

Inventors: Callen; Gregory Scott (Anaheim, CA)

Assignee:

International Classification: H04K 1/00 (20060101)

Expiration Date: 8/26/12018