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IBM : developerWorks : Security : Education - online courses
Introduction to cryptology: Pt. 1		Download tutorial zip fileView letter-sized PDF fileView A4-sized PDF fileE-mail this tutorial to a friend
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Endgame
 1. How to break a substitution cipher
 2. How to break a substitution cipher, part 2
 3. How to break a substitution cipher, part 3
 4. Conclusion
 5. Further reading
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