Transcript master-phd-examples - FSU Computer Science Department

Master and PhD examples
Prof. Yvo Desmedt
Department of Computer Science
Florida State University, USA
www.cs.fsu.edu/~desmedt
Partially funded by NSF and DARPA
 by Yvo Desmedt
A. General interests
B. Master thesis: examples:
1. Computer viruses
2. Information Hiding and Cryptography
C. PhD thesis: examples:
Threshold cryptography
A. General interests
1. Cryptography:
– Classical topics: Authenticity, Integrity,
Privacy
– Modern topics:
• anonymity
• broadcast privacy
• protecting against insiders, e.g.
– when a company is signing
– protecting copyright
• law enforcement
•…
A. General interests
2. Computer Security:
– Computer viruses
– Information hiding
– Secure distributed computation
– Survivable computers
A. General interests
3. Network Security:
– PKI
– Security and Reliability in:
• non-point-to-point networks
• in unknown networks
• wireless
B. Master thesis: examples:
1. Computer viruses:
platform independent computer virus:
written in LaTeX/emacs:
Student: K. McMillan
2. Information Hiding and Cryptography
Students: S. Hou and T. V. Le
Presented at: Asiacrypt 98, Information Hiding 99
B. Master thesis: Information Hiding
Motivation:
History: steganography: older than cryptography?
Importance of modern steganography:
– Bypass key escrow
– Protect privacy
– Achieve some form of anonymity
– Protect freedom of expression
– Facilitate spies to communicate
–…
B. Master thesis: Information Hiding
Current security of steganography
– low to poor
– requires complex computer programs
Security goals:
– Privacy: unconditional
– Steganography: warden=human without computer
– Key: must also be steganographic
Implementation goal:
– Decryption: without computer
B. Master thesis: Information Hiding
Audio cryptography: binary case:
– Sound (and also light!) is a wave. This implies that a
wave can cancel another one provided these are 180
degrees out of phase.
– Note: for light this has been called: Optical
Cryptography: however expensive equipment is
needed to realize this.
– Cover: e.g., music
– Demo:
B. Master thesis:
Information Hiding
Audio cryptography: non-binary case:
Simulated output: this is the method to use when there is no analog mixer
and amplifier:
Modular Amplitude Method: share 1 , share 2 , simulated sum
Phase Shifting Method: share 1 , share 2 , simulated sum
Frequency Flipping Method: share 1 , share 2
, simulated sum
C. PhD thesis: examples:
Threshold cryptography
Students: Y. Frankel and B. King
Allows, e.g. company to sign instead of a single
individual. For more details: see:
www.cs.fsu.edu/~desmedt
Several publications