1. Topic: Implementation of SSL & TLS for Application servers 03/19/08

6. Position of TLS: 03/19/08

8. * In Greek means “secret writing.” *Refers to the science and art of transforming messages to make them secure and immune to attacks. Types of Cryptography: Symmetric-Key Cryptography Asymmetric-Key Cryptography

9. Symmetric-key cryptography

11. Asymmetric-key encryption

12. 03/19/08 Asymmetric Encryption/Decryption

14. TCP/IP Protocol Suite Hash function

15. TCP/IP Protocol Suite Sender site

16. Receiver site

18. 03/19/08 Bob’s private key Bob’s public key Anyone can get Bob's Public Key, but Bob keeps his Private Key to himself Bob’s Co-workers Pat Doug Susan

20. 03/19/08 Bob prepares a message Digest using Hash function

21. 03/19/08 Bob encrypts the digest with his private key. Digital Signature Created

22. 03/19/08 Digital Signature Appended to the Original document & Sent to Susan

23. 03/19/08 Separates Original Document & Digital signature

24. TCP/IP Protocol Suite Digital signature does not provide privacy. If there is a need for privacy, another layer of encryption/decryption must be applied. Note:

28. X.509 fields

33. COMMERCIAL CA: JOB - TO VERIFY THE AUTHENTICITY OF OTHER COMPANIES’ MESSAGES ON THE INTERNET EXAMPLE:VERISIGN,THAWTE . 03/19/08

40. Thank you