Cryptosystem for encrypting digital image or voice file

Details Cryptosystem for encrypting digital image or voice file Cryptosystem for encrypting digital image or voice file

1998-01-27

2000-02-08

Swann, Tod R.

Cryptography

By modifying optical image

380 28, 380 51, 380 55, H04L 900, H04L 928, G09C 100

Patent

active

06023511&

ABSTRACT:
The present invention provides a cryptosystem for encrypting an original image or voice file by using a camouflaging image or voice file. Each of the original and camouflaging files comprises a plurality of basic units arranged according to a predetermined sequence. The cryptosystem comprises a memory for storing the original and camouflaging files and programs, a processor for executing the programs stored in the memory, and an encrypting program stored in the memory for encrypting the original file by using the camouflaging file. The encrypting program will divide all the basic units of each of the original and camouflaging files into a plurality of equal-sized data blocks, assign an index number to each data block of the camouflaging file, compare each data block of the original file with the data blocks of the camouflaging file according to a predetermined comparing method to find a most similar data block, record the index number of the most similar data block for each data block of the original file in the memory, and merge all the recorded index numbers of the original file with lower order bits of the basic units of the camouflaging file according to a predetermined merging method to generate an encrypted file for the original file.

REFERENCES:
patent: 4949381 (1990-08-01), Pastor
patent: 5031215 (1991-07-01), Pastor
patent: 5485526 (1996-01-01), Tobin
patent: 5583941 (1996-12-01), Yoshida et al.

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