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IBM : developerWorks : Security : Education - online courses
Introduction to cryptology: Pt. 2
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Symmetric encryption algorithms
 1. Getting started
 2. Diffusion and substitution - general
 3. Diffusion and substitution - Gnosis cipher, part 1
 4. Diffusion and substitution - Gnosis cipher, part 2
 5. All praise XOR
 6. XOR in action
 7. Snake-oil warning, part 1
 8. Snake-oil warning, part 2
 9. Sub-algorithm rounds
 10. S-boxes, part 1
 11. S-boxes, part 2
 12. Avalanche effects, part 1
 13. Avalanche effects, part 2
 14. Avalanche effects, part 3
 15. Feistel networks
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