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Conclusion

Conclusion. Course Summary. Crypto Basics, symmetric key, public key, hash functions and other topics, cryptanalysis Access Control Authentication, authorization, firewalls, IDS Protocols Simple authentication Real-World: SSL, IPSec, Kerberos, WEP, GSM Software

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Conclusion

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  1. Conclusion Conclusion 1

  2. Course Summary • Crypto • Basics, symmetric key, public key, hash functions and other topics, cryptanalysis • Access Control • Authentication, authorization, firewalls, IDS • Protocols • Simple authentication • Real-World: SSL, IPSec, Kerberos, WEP, GSM • Software • Flaws, malware, SRE, development, trusted OS Conclusion 2

  3. Crypto Basics • Terminology • Classic cipher • Simple substitution • Double transposition • Codebook • One-time pad • Basic cryptanalysis Conclusion 3

  4. Symmetric Key • Stream ciphers • A5/1 • RC4 • Block ciphers • DES • AES, TEA, etc. • Modes of operation • Data integrity (MAC) Conclusion 4

  5. Public Key • Knapsack (insecure) • RSA • Diffie-Hellman • Elliptic curve crypto (ECC) • Digital signatures and non-repudiation • PKI Conclusion 5

  6. Hashing and Other • Birthday problem • Tiger Hash • HMAC • Clever uses: online bids, spam reduction • Other topics • Secret sharing • Random numbers • Information hiding (stego, watermarking) Conclusion 6

  7. Advanced Cryptanalysis • Linear and differential cryptanalysis • RSA side channel attack • Knapsack attack (lattice reduction) • Hellman’s TMTO attack on DES Conclusion 7

  8. Authentication • Passwords • Verification and storage (salt, etc.) • Cracking (math) • Biometrics • Fingerprint, hand geometry, iris scan, etc. • Error rates • Two-factor, single sign on, Web cookies Conclusion 8

  9. Authorization • ACLs and capabilities • MLS  BLP, Biba, compartments, covert channel, inference control • CAPTCHA • Firewalls • IDS Conclusion 9

  10. Simple Protocols • Authentication • Using symmetric key • Using public key • Establish session key • PFS • Timestamps • Authentication and TCP • Zero knowledge proof (Fiat-Shamir) Conclusion 10

  11. Real-World Protocols • SSL • IPSec • IKE • ESP/AH • Kerberos • GSM • Security flaws Conclusion 11

  12. Software Flaws and Malware • Flaws • Buffer overflow • Incomplete mediation, race condition, etc. • Malware • Brain, Morris Worm, Code Red, Slammer • Malware detection • Future of malware • Other software-based attacks • Salami, linearization, etc. Conclusion 12

  13. Insecurity in Software • Software reverse engineering (SRE) • Software protection • Digital rights management (DRM) • Software development • Open vs closed source • Finding flaws (math) Conclusion 13

  14. Operating Systems • OS security functions • Separation • Memory protection, access control • Trusted OS • MAC, DAC, trusted path, TCB, etc. • NGSCB • Technical issues • Criticisms Conclusion 14

  15. Crystal Ball • Cryptography • Well-established field • Don’t expect major changes • But some systems will be broken • ECC is a major “growth” area • Quantum crypto may prove worthwhile… • …but for now it is mostly hype Conclusion 15

  16. Crystal Ball • Authentication • Passwords will continue to be a problem • Biometrics should become more widely used • Smartcard/tokens will be used more • Authorization • ACLs, etc., well-established areas • CAPTCHA’s interesting new topic • IDS is a hot topic Conclusion 16

  17. Crystal Ball • Protocols are challenging • Very difficult to get protocols right • Protocol development often haphazard • Kerckhoffs’ Principle for protocols? • How much would it help? • Protocols will continue to be a significant source of security failure Conclusion 17

  18. Crystal Ball • Software is a huge security problem today • Buffer overflows should decrease… • …but race condition attacks might increase • Virus writers are getting smarter • Polymorphic, metamorphic, what’s next? • Future of malware detection? • Malware will continue to plague us Conclusion 18

  19. Crystal Ball • Other software issues • Reverse engineering will not go away • Secure development will remain hard • Open source is not a panacea • OS issues • NGSCB could change things… • …for better or for worse? Conclusion 19

  20. The Bottom Line • Security knowledge is needed today… • …and it will be needed in the future • Necessary to understand technical issues • The focus of this class • But technical knowledge is not enough • Human nature, legal issues, business issues, etc. • Experience also important Conclusion 20

  21. A True Story • The names have been changed… • “Bob” took my undergrad security class • Bob then got an intern position • At a major company that does security • One meeting, an important customer asked • “Why do we need signed certificates?” • “After all, they cost money!” • The silence was deafening Conclusion 21

  22. A True Story • Bob’s boss remembered that Bob had taken a security class • So he asked Bob, the lowly intern, to answer • Bob mentioned “man-in-the-middle” attack • Customer wanted to hear more • Bob explained MiM attack in some detail • The next day, “Bob the lowly intern” became “Bob the fulltime employee” Conclusion 22

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