The document proposes Sentry, a tool that provides memory encryption on smartphones and tablets to protect data from memory attacks. Sentry implements AES encryption and decryption inside the memory of the System on Chip (SoC). It was developed by researchers at the University of British Columbia, University of Toronto, and Microsoft Research. Evaluation showed Sentry incurred only 2% additional battery consumption for 150 locks/unlocks, protecting against cold boot attacks and other threats with minimal performance overhead.

1. PROTECTING DATA ON SMARTPHONES AND
TABLETS FROM MEMORY ATTACKS
PATRICK COLP, JIAWEN ZHANG, JAMES GLEESON, SAHIL SUNEJA, EYAL DE LARA,
HIMANSHURAJ, STEFAN SAROIU, AND ALEC WOLMAN
UNIVERSITY OF BRITISH COLUMBIA, ‡UNIVERSITY OF TORONTO, AND ∗MICROSOFT
RESEARCH
Presentation by:
Mana Eskandari
Francisco de Melo jr

2. TIPS IMPROVE SECURITY ON YOUR
SMARTPHONE
• Use a PIN
• Turn off Wi-Fi and Bluetooth® when not in use
• Download apps just from trusted sources

3. OUTLINE
• Smartphones components
• Describing the motivation: attacks
• How to prevent them
• Sentry
• Development of this tool
• Evalutation of Performance
• Comparison with similar tools
• Other relevant work
• Critics

4. SMARTPHONE ARCHITECTURE
• Processor
• Memory
• SoC

5. DESCRIBING THE ATTACKS
• Cold boot attacks
• DMA attack
• Bus monitoring

6. HOW CAN WE PREVENT THEM?
• Cold boot attacks
• Other attacks
• JTAG attacks
• Software attacks

7. SENTRY
Concept
Main caractheristic
AES_encryption x AES_decryption
Implementation in Nvidia and Nexus 4

8. DEVELOPMENT
• Development of security inside the memory of SoC

9. RESULT
• 2 % battery consumption for 150 locks/unlocks

10. SIMILAR TOOLS
• ARM TrustZone
• SGX – Intel Software Guard Extentions

11. OTHER RELEVANT ARTICLES
• Paper describing Cold boot attacks
• Paper about

12. CRITICS ABOUT THE PAPER
• Restricted threats
• Third part security analysis
• Software attacks

13. CONTACT
• Contact from the authors of the paper:
• Contact of the presentation:
• Mana
• Isnaldo Francisco

14. REFERENCES
• Patrick Colp, Jiawen Zhang, James Gleeson, Sahil Suneja, Eyal de Lara, HimanshuRaj,
Stefan Saroiu, and Alec Wolman
• http://www.verizonwireless.com/mobile-living/network-and-plans/security-app-tips-
to-keep-your-smartphone-secure/