Dynamic Substitution Summary Show

In HTML Pseudo-Slides
with Online Links to Details

A Ciphers By Ritter Page

Novel Encryption Technology Available Nowhere Else

Terry Ritter
ritter@ciphersbyritter.com

2005 November 1

1. Author Background
2. Dynamic Substitution Summary
3. A Cipher
4. A Stream Cipher
5. Dynamic Substitution Encipher
6. Dynamic Substitution Advantages
7. Dynamic Substitution Decipher
8. Dynamic Substitution CONCLUSION

1. Author Background

• 3 decades electrical engineering
• 16 years cryptographic technology
• 3 fundamental crypto patents
• book-length crypto glossary
• introduction to cryptography
• many web articles

• a stream cipher combiner
• instead of exclusive-OR which has no strength

• new layered strength for stream ciphers
• keyed tables are unknown to the opponent
• table contents are rearranged as used
• protects the random number generator (RNG)
• allows a simpler and faster RNG
• unique patented technology

3. A Cipher

• a key-selected transformation between plaintext and ciphertext
• the opponent has ciphertext:
  • the ciphertext appears random
  • different keys return different potential messages
  • there are too many keys to try them all
  • the real message is "a needle in a haystack"

4. A Stream Cipher

• ciphers individual data elements:
  • directly handles messages of arbitrary size
  • need not wait to accumulate a block
  • no block-fill latency
• typically an RNG + combiner

• a substitution table with changing contents:
  1. substitute character through table
  2. swap that entry with RNG selection
• after an entry is used, it is changed
• the more it is used, the more it is changed

• the RNG sequence remains hidden
• keying makes tables unknown to opponent
• table contents rearrange after every use

• tables support new combining strengths:
  • sequence of multiple combiners
  • dynamic selection among different combiners

• keep both forward and inverse tables:
  1. decipher through inverse table
  2. update inverse table
  3. update forward table

• new strength layers for stream ciphers
• each combiner table is keyed and unique
• nonlinear combiners are useful in sequence
• or dynamically select among multiple combiners
• protect simple and fast RNG's

Terry Ritter, and his current address.