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IBM : developerWorks : Security : Education - online courses
Introduction to cryptology: Pt. 1
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What makes a cryptographic protocol strong?
 1. Passphrase, password, and key
 2. Passphrase, password, and key, part 2
 3. Passphrase, password, and key, part 3
 4. Security versus obscurity
 5. Security versus obscurity, part 2
 6. Key lengths and brute-force attacks
 7. Key lengths and brute-force attacks, part 2
 8. Key lengths and brute-force attacks, part 3
 9. Key lengths and brute-force attacks, part 4
 10. Dictionary attacks on passwords
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