2. Agenda Definitions Why cryptography is important? Available technologies Benefits & problems

3. Essential Terms Cryptography Encryption Plain text  Cipher text Decryption Cipher text  Plain text Cryptanalysis Cryptology

4. Information Security for…  Defending against external/internal hackers  Defending against industrial espionage  Securing E-commerce  Securing bank accounts/electronic transfers  Securing intellectual property  Avoiding liability

5. Types of Secret Writing Secret writing Steganography Cryptography

6. Steganography Steganography – covered writing – is an art of hiding information Popular contemporary steganographic technologies hide information in images

7. Hiding information in pictures Image in which to hide another image Image to hide within the other image

8. Retrieving information from pictures Image with other hidden within Recreated image

9. Types of Secret Writing Secret writing Steganography Cryptography SubstitutionTransposition Code Cipher

10. Benefits of Cryptographic Technologies Data hiding Data integrity Authentication of message originator Electronic certification and digital signature

11. Potential Problems with Cryptographic Technologies? False sense of security if badly implemented Government regulation of cryptographic technologies/export restrictions Encryption prohibited in some countries

12. How Secure are Today’s Technologies? Encryption does not guarantee security! Many ways to beat a crypto system NOT dependent on cryptanalysis, such as: –Viruses, worms, hackers, etc. –Unauthorized physical access to secret data Cryptography is only one element of comprehensive computer security

13. DOUBTS…??? Your questions are welcome!