Diffusion in SDES

This applet provides an overview of how Simplified DES works. It also demonstrates the diffusion property. Any time a magenta bit is used as input, any output bits that are affected by it will also be magenta. One bit starts out magenta, and by the end of encryption all eight are magenta, showing that SDES has fairly good diffusion properties.

Click on the applet to begin. The applet may take a minute to load.

Animation engine by Eric Fikus, content and animation code modifications by Jedidiah Crandall

For a good background reading on S-DES and diffusion see Chapter 3 of Cryptography and Network Security: Principles and Practice by William Stallings

This was created as part of the Cryptography Module of NSF Award No. 0113627: "Increasing Security Expertise in Aviation-oriented Computing Education: A Modular Approach", at Embry-Riddle Aeronautical University in Prescott, Arizona.

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Last update: August 1, 2002