Reversible cipher

• US 8,817,976 B2
• Filed: 06/24/2011
• Issued: 08/26/2014
• Est. Priority Date: 06/24/2011
• Status: Expired due to Fees

• Current Assignee: Callen, Gregory Scott
• Original Assignee: Callen, Gregory Scott
• Inventors: Callen, Gregory Scott
• Primary Examiner(s): Zele, Krista
• Assistant Examiner(s): FORMAN, JAMES Q
• Application Number:
  US13/168,679
• Publication Number:
  US 20120328091A1
• Time in Patent Office: 1,159 Days
• Field of Search: 380/28
• US Class Current: 380/28
• CPC Class Codes: H04L 9/065 Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
• CPC Class Codes: H04L 9/0662 with particular pseudorandom sequence generator
• CPC Class Codes: H04L 9/0861 Generation of secret information including derivation or calculation of cryptographic keys or passwords
• CPC Class Codes: H04L 9/34 Bits, or blocks of bits, of the telegraphic message being interchanged in time for speech signals H04K1/06

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.

Claims

1. A method of securing data, comprising:

receiving a plaintext data unit;

encrypting 4 bits of a plaintext data unit with a transposed Sudoku to form a first ciphertext unit, wherein the first ciphertext unit comprises one of ten preselected bit combinations;

encrypting the first ciphertext unit with pseudorandom mixing bits different from the Sudoku to form a second ciphertext unit, wherein the pseudorandom mixing bits are produced using a multiplexer, wherein the multiplexer is a 1 of 4 multiplexer and wherein encrypting the first ciphertext unit with pseudorandom mixing bits includes combining the pseudorandom mixing bits with the first ciphertext unit using an exclusive OR function to produce the second ciphertext unit; and

outputting the second ciphertext unit corresponding to the plaintext data unit.

2. The method of claim 1 wherein encrypting a plaintext data unit with the transposed Sudoku and encrypting the first ciphertext unit with pseudorandom mixing bits are done using a hardware language for encryption.

3. The method of claim 1 wherein encrypting a plaintext data unit with the transposed Sudoku and encrypting the first ciphertext unit with pseudorandom mixing bits are done using a stream-based cipher protocol.

4. The method of claim 1 further comprising integrating a password, which may be used to encrypt and decrypt the plaintext data unit at a source and a destination using a predetermined mixing value set.

5. The method of claim 1 wherein the transposed Sudoku is configured to exclude complementary values that may cause ignore states when encrypting the 4 bits of the plaintext data unit with the transposed Sudoku to form the first ciphertext unit.

6. A cipher device, comprising:

an input port;

a FPGA coupled with the input port, and configured using an HDL to perform encrypting 4 bits of a plaintext data unit with a transposed Sudoku to form a first ciphertext unit, wherein the first ciphertext unit comprises one of ten preselected bit combinations, and encrypting the first ciphertext unit with pseudorandom mixing bits different from the Sudoku to form a second ciphertext unit; and

an output port coupled with the FPGA;

wherein the cipher device is configured to produce the pseudorandom mixing bits using a multiplexer, wherein the multiplexer is a 1 of 4 multiplexer and wherein encrypting the first ciphertext unit with pseudorandom mixing bits includes combining the pseudorandom mixing bits with the first ciphertext unit using an exclusive OR function to produce the second ciphertext unit,

wherein the FPGA, the input port, and the output port are configured as a FOB device, and wherein the plaintext is received at an input port and a corresponding second ciphertext unit is transmitted to the output port.

7. The cipher device of claim 6, further comprising:

a memory device coupled with the FPGA.

8. The cipher device of claim 6 where the input port is a USB port and the output port is a USB port.

9. The cipher device of claim 6 further comprising a Sudoku filter in direct communication with 4 bits of an input register and a multiplexer in direct communication with 2 different bit inputs, which do not first pass through the Sudoku filter.

10. The cipher device of claim 9 wherein the Sudoku filter is configured to shuffle or filter data received from the 4 bit inputs into 10 preselected bit combinations.