1 / 23

NYU Cryptography Group at Courant Institute

NYU Cryptography Group at Courant Institute. Faculty: Yevgeniy Dodis dodis@cs.nyu.edu Victor Shoup shoup@cs.nyu.edu. Students: Nelly Fazio Michael Freedman Anca Ivan Antonio Nicolosi Roberto Oliveira Shabsi Walfish. Cryptography Reading Group. Meet every week

lindquist
Download Presentation

NYU Cryptography Group at Courant Institute

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. NYU Cryptography Group at Courant Institute • Faculty: • Yevgeniy Dodis dodis@cs.nyu.edu • Victor Shoup shoup@cs.nyu.edu • Students: • Nelly Fazio • Michael Freedman • Anca Ivan • Antonio Nicolosi • Roberto Oliveira • Shabsi Walfish

  2. Cryptography Reading Group • Meet every week • This semester Friday, 1pm, room 101 • Drop by! • Contact me to be put on the mailing list http://www.scs.cs.nyu.edu/crypto

  3. Our Main Goals • Improving the security and/or efficiency of cryptographic applications • Designing new, provably secure cryptographic primitives • Formalization and rigorous analysis of common cryptographic practices • Protecting against key exposure • Secure distributed/multiparty computation

  4. Our Style: Provable Security • Formal definition for the cryptographic task at hand • A concrete scheme which provably satisfies the above definition, assuming some commonly believed and well studied mathematical problem is “hard” • Ensures that the only way to break the cryptographic scheme is to break a well studied mathematical problem, which is very unlikely (e.g., factoring) • Gives much higher guarantee/assurance than commonly utilized “heuristic” approaches

  5. as a devil… Crypto Skills • Creativity: open mind, love for puzzles • Formalism (proofs!) and elementary math (number theory, probability) • Ability to ask interesting questions • Ability to think

  6. Some of Our Projects • Signature and Encryption Schemes • Authenticated Encryption • Resilience to Key Exposure • Distributed and Multi-party Cryptography • Two-party computation • Digital Right Management • Cryptography with Imperfect Randomness • Ideal Hash Function Methodology • Fault-tolerant Authentication • Privacy and Anonymity …

  7. Some projects I have been involved in @ NYU… Warnings: • Not meant to… • give formal introduction to cryptography • be crystal clear if you see it for the first time • Instead… • give vague summary of the “kind” of things I like • emphasize joint works with students and faculty • Talk to me if interested in details!

  8. Partial Key Exposure • "Exposure-Resilient Functions and All-Or-Nothing Transforms" , Eurocrypt, 2000. • "On Perfect and Adaptive Security in Exposure-Resilient Cryptography", Eurocrypt, 2001. • "Exposure-Resilience for Free: the Case of Hierarchical ID-based Encryption", IEEE International Security In Storage Workshop (SISW), 2002.

  9. Key Evolving Schemes • Designed new model of key-insulated security, led to intrusion-resilient security • "Key-Insulated Public Key Cryptosystems", Eurocrypt, 2002. • "Strong Key-Insulated Signature Schemes", Workshop on Public Key Cryptography (PKC), 2003. • "Intrusion-Resilient Public-Key Encryption", RSA Conference, Cryptography Track (CT-RSA), 2003.

  10. Two-Party Schemes • Max Krohn, David Mazieres and Antonio Nicolosi, "Proactive Two-Party Signatures for User Authentication", Network and Distributed System Security Symposium (NDSS), 2003. • Anca Ivan, "Proxy Cryptography Revisited", Network and Distributed System Security Symposium (NDSS), 2003. • "Generic Two-party CCA-secure Encryption Scheme and its Applications", manuscript

  11. Authenticated Encryption • "On the Security of Joint Signature and Encryption", Eurocrypt, 2002. • "Concealment and Its Applications to Authenticated Encryption", Eurocrypt, 2003. • Michael Freedman and Shabsi Walfish, "Parallel Signcryption with OAEP, PSS-R and other Feistel Paddings", submitted to Crypto2003. • Michael Freedman and Shabsi Walfish, "Universal Padding Schemes", manuscript. • "Parallel Authenticated Encryption", manuscript.

  12. Digital Right Management • Nelly Fazio, "Public Key Broadcast Encryption for Stateless Receivers", ACM Workshop on Digital Rights Management, 2002. • Nelly Fazio, "Public Key Broadcast Encryption Secure Against Adaptive Chosen Ciphertext Attack", Workshop on Public Key Cryptography (PKC), 2003. • Nelly Fazio, "Fully Scalable Public-Key Traitor Tracing", submitted, 2003. • Nelly Fazio, "Forward-Secure Broadcast Encryption", manuscript.

  13. Imperfect Randomness • "New Imperfect Random Source with Applications to Coin-Flipping", International Colloquium on Automata, Languages and Programming (ICALP), 2001. • Joel Spencer, "On the (non-)Universality of the One-Time Pad", Foundations of Computer Science (FOCS), 2002. • Roberto Oliveira, "On Extracting Private Randomness over a Public Channel", manuscript.

  14. Distributed Cryptography • "Parallel Reducibility for Information-Theoretically Secure Computation", Crypto, 2000. • "Efficient Construction of (Distributed) Verifiable Random Functions", Workshop on Public Key Cryptography (PKC), 2003 • “Distributed Block Ciphers", manuscript

  15. Cryptography: Other… • "Lower Bounds for Oblivious Transfer Reductions", Eurocrypt, 1999. • "A Cryptographic Solution to a Game Theoretic Problem", Crypto, 2000. • "On the Power of Claw-Free Permutations", Conference on Security in Communication Networks (SCN), 2002

  16. Algorithmic Game Theory • Can moderate taxes force selfish users minimize global traffic and congestion? • Richard Cole, "Pricing Network Edges for Heterogeneous Selfish Users", Symposium on Theory of Computing (STOC), 2003. • Richard Cole, "The Cost of Taxes for Selfish Routing", ACM Conference on Electronic Commerce (EC), 2003.

  17. My Other Interests • Algorithms: randomized and approx. algorithms, network design… • Coding Theory: relates to crypto too • Complexity Theory: derandomization… • Combinatorics and Graph Theory • Anything else that has proofs and requires problem solving…

  18. Recap of some recent group activities

  19. Signature & Encryption • First provably secure and yet efficient signature and encryption schemes [CS98, CS99, CS02] • lead to new standards for PKI • Efficient schemes utilizing ideal hash functions [Sho00, Sho01, DR02, DFW03, DFJW03] • Signature / encryption schemes with extended functionalities [CS03, DF03, NKDM03]

  20. Authenticated Encryption • First formal modeling of public-key authenticated encryption (signcryption) [ADR02] • Parallel authenticated encryption [ADR02, DFW03, DFJW03, Dod03a] • Designing authenticated encryption for long messages [DA03]

  21. Key Exposure Protection • Exposure-resilient functions and All-or-nothing transforms [CDH00, DSS01] • Key-insulated signature and encryption scheme [DKXY02, DKXY03] • Intrusion-Resilient Encryption [DKY03] • Remotely-Keyed Encryption [DA03] • Server-Aided/Proxy/Proactive Cryptography [NKDN03, ID03, DY02]

  22. Distributed Computation • Byzantine Agreement [CKS00, CKPS01, KS01] • Threshold Cryptosystems [SG98,Sho00] • Distributed verifiable random functions and block ciphers [Dod03b, DY03] • Joint generation of special RSA keys [ACS02] • Two-party computation [NKDN03, ID03] • Concurrent protocols composition [DM00]

  23. Some Other Projects • Digital right management [DF02, DF03, DFKY03] • Ideal Hash Function Methodology [Dod03b, DS03] • Basing Cryptography on Imperfect Randomness [DS02, DO03] • Cryptography and Game Theory [DHR00] • …

More Related