Cryptography on TFT displays

1. Cryptography on TFT displays Pablo Sánchez Pedrosa

2. Contents • I) Introduction • II) Why and how • III) Current applications • IV) An example of processor • V) Conclusions

3. I)Introduction • What does cryptrography mean? Kriptos Hidden Graphein Write

4. I) Introduction • Some historic examples: • Greeks and romans • Enigma ( Second World War)

5. I)Introduction • Nowadays • Computer and network security • Communications • Militar operations • Now our messages are bit strings • We use huge numbers (10^100) • Discourage attackers

6. I)Introduction • What means TFT? • Thin Film Transistor • Algorithm in hardware

7. II) Why and how • New technology still developing • Testing needed • Technical problems must be solved • New trusted applications needed • Device regarded as safe to use

8. II)Why and how • Reasons for implementation: - Enhance developing of e-commerce - Increasing network security - Continuous rise of hacking - Offer new services

9. Structure diagram II)Why and how

10. II)Why and how • Why TFT screens? Firstly, the end of cathodic rays tube. Very diffrent way of work

11. II)Why and how • Secondly, change the CMOS to TFT technology. Due to economical and quality reasons - Still looking for TFT standard

12. II)Why and how • Last advance: OLED technology instead of LCD and plasma

13. III)Current applications • There are still no current applications!! • All of them under development and expected for 2007 and on.

14. III)Current applications • These technology is not only available for TV • Computers, mobile phones or PDA also

15. III)Current applications • Electronic commerce in a point-of-sale terminal • Trough direct communication with the bank • Trough smart card payment • First application proposed (1995) • Increase ecommerce • Avoiding the use of cash

16. III)Current applications • Electronic commerce with a mobile • Already is patented in US • More secure, as two acknowledges must be done

17. III)Current applications • eBanking at home • But we know about „man in the middle attack“ • FINREAD attempts to reinforce security • Stresses the need of a trusted display • Looks slow and not very attractive

18. III)Current applications

19. III)Current applications • Include a smart card reader • Account and PIN number are no longer enough • All communication is between the bank and the card

20. III)Current applications

21. III)Current applications • Secure terminals for e-voting • Identification with ID and digital signature • Through a computer • With a personal PDA

22. III)Current applications • Multimedia broadcasting for mobile phones • Only the user can see the contents • Information decrypted in the display • OMA inverting on it

23. III)Current applications • TV programmes broadcasting • Only the owner of a certain terminal can access the information • World cup and SONY

24. III)Current applications • Why not in telemedicine?

25. III)Current applications • GPS or Galileo enhanced protection • For both militar and public use

26. III)Current applications • Meetings trough videoconference • Protection of classified information

27. IV) An example of processor • Under development!!

28. IV)An example of processor • DES coprocessor

29. IV)An example of processor • DES algorithm

30. IV)An example of processor • Remarks: • DES algorithm can be broken • Currently using AES or triple-DES

31. IV)An example of processor • VeMiCry block:

32. IV)An example of processor • RSA algorithm: • Choose 2 prime numbers p and q . p ≠ q • Compute n=p*q • Compute F(n) = (p-1)*(q-1) • Choose a random RP integer e such that 1<e< F(n) • Choose d such that d*e= 1 mod F(n) • Remember numbers have only one inverse!

33. V)Conclusions • Where is the limit of DRM? • Freedom to be informed • Economical discrimination • Are this applications really necessary ? • Already good security in some cases • The end of hacking?