Note:
I have moved to the University of the West of England as of 1st of March 2017... My new web page is here. You can contact me on FirstName.LastName@gmail.com or FirstName.LastName@uwe.ac.uk
About Me
I am a research associate in the Information Security Research Group at University College London .
Prior to joining UCL, I was a post-doctoral researcher in the
Cryptography Group at the University of Bristol, where I also did some lecturing.
I have obtained my PhD in Computer Science from the University of Bristol working on Cryptography & Information Security in 2012. My
supervisors were: Nigel Smart and
Bogdan Warinschi
I got my Master's (with Distinction) from the University of Bristol in 2007.
Between obtaining my first degree and starting my Master's, I have worked for a number of years as a Programmer & System Analyst.
Research Interests
I am primarily interested in Cryptography & Information Security. I am also interested in Programming Languages and Web Security.
Current Research
My current research is centered around privacy-preserving cryptographic protocols. Topics I have worked on include:
- Proof systems and their applications.
- Signature schemes and related primitives (e.g. blind signatures, Group Signatures, Ring Signatures, etc.).
- Direct Anonymous Attestation.
- Attribute-Based Cryptography.
- Public-Key Encryption.
CV
Available on request.
Preprints:
- Essam Ghadafi. More Efficient Structure-Preserving Signatures - Or: Bypassing the Type-III Lower Bounds.
Cryptology ePrint Archive:
[Full Paper].
Publications:
- Essam Ghadafi. Efficient Round-Optimal Blind Signatures in the Standard Model. FC 2017 (to appear).
- Jonathan Bootle, Andrea Cerulli, Pyrros Chaidos, Essam Ghadafi, and Jens Groth. Foundations of Fully Dynamic Group Signatures.
ACNS 2016, 117-136, June 2016.
- Essam Ghadafi. Short Structure-Preserving Signatures. CT-RSA 2016, pp. 305-321. February 2016.
- Jonathan Bootle, Andrea Cerulli, Pyrros Chaidos, Essam Ghadafi, Jens Groth and Christophe Petit. Short Accountable Ring Signatures Based on DDH.
ESORICS 2015, pp. 243-265. September 2015.
- E. Ghadafi. Stronger Security Notions for Decentralized Traceable Attribute-Based Signatures and More Efficient Constructions.
CT-RSA 2015, pp. 391-409. April 2015.
- E. Ghadafi. Efficient Distributed Tag-Based Encryption and its Application to Group Signatures with Efficient Distributed Traceability.
Latincrypt 2014, pp. 327-347. September 2014.
- A. El Kaafarani, L. Chen, E. Ghadafi, and J. H. Davenport. Attribute-Based Signatures with User-Controlled Linkability. CANS 2014.
- A. El Kaafarani, E. Ghadafi, and D. Khader. Decentralized Traceable Attribute-Based Signatures. CT-RSA 2014, pp. 327-348. February 2014.
- E. Ghadafi. Sub-linear Blind Ring Signatures without Random Oracles. Coding and Cryptography: IMACC 2013, pp. 304-323. December 2013.
- D. Bernhard, G. Fuchsbauer and E. Ghadafi. Efficient Signatures of Knowledge and DAA in the Standard Model. The 11th International Conference on Applied Cryptography and Network Security - ACNS 2013. pp. 518-533.
- E. Ghadafi. Sub-linear Blind Ring Signatures without Random Oracles. Coding and Cryptography: IMACC 2013, pp. 304-323. December 2013.
- E. Ghadafi. Formalizing Group Blind Signatures and Practical Constructions in the Standard Model. The 18th Australasian Conference on Information Security and Privacy -- ACISP 2013. pp. 330-346.
- D. Bernhard, G. Fuchsbauer, E. Ghadafi, N.P. Smart and B. Warinschi. Anonymous attestation with user-controlled linkability. Int. Journal of Information Security, 1615-5262, February 2013.
- E. Ghadafi and N.P. Smart. Efficient Two-Move Blind Signatures in the Common Reference String Model. Information Security Conference -- ISC 2012.
- E. Ghadafi, N.P. Smart and B. Warinschi. Groth-Sahai Proofs Revisited. Public Key Cryptography -- PKC 2010, pp. 177-192
- E. Ghadafi, N.P. Smart and B. Warinschi. Practical zero-knowledge proofs for circuit evaluation. Coding and Cryptography: IMACC 2009, pp. 469-494. December 2009
Teaching:
While at Bristol, I have been involved in teaching the following courses:
- Databases
- Data Structures and Algorithms
- Software Product Engineering
- Crypto A
- Object Oriented Programming with Java
Research Visits
- From 10th of February to 18th of March 2016, University of Oxford -- Oxford, UK.
- From 1st of March 2013 to 31st of March 2013, Brown University -- Rhode Island, USA.
Seminars & Talks
- More Efficient Structure-Preserving Signatures: Or Bypassing the Lower Bounds. University of Oxford, Oxford – UK, March 2016. [PDF]
- Decentralized Traceable Attribute-Based Signatures. University College London , London – UK, April 2015. [PDF]
- Direct Anonymous Attestation. Brown University , Providence, RI – USA, March 2013. [PDF]
- Direct Anonymous Attestation. Bath University , Bath – UK, February 2013. [PDF]
Other Activities:
Program Committees:
External Reviewing:
- IMACC 2011, Pairing 2010, PKC 2010, EUROCRYPT 2012, PKC 2012, ACM CCS 2012, ASIACRYPT 2013, EUROCRYPT 2014, CRYPTO 2014, PKC 2015, CT-RSA 2015, IMACC 2015, ASIACRYPT 2015, PKC 2016, ACNS 2016, CRYPTO 2016.
Hobbies
Cycling, Football and Swimming .
Other
[Other]
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