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Alexandru Cojocaru

Alexandru Cojocaru

Chancellor's Fellow at School of Informatics, University of Edinburgh

Research Interests:
  • Quantum Cryptography

  • Post-quantum cryptography

  • Complexity Theory

Alex is currently a postdoctoral scholar in QuICS, University of Maryland and will start as a Chancellor's Fellow at the University of Edinburgh in January 2023. His primary research interests lie in the fields of quantum cryptography, post-quantum cryptography, query algorithms and quantum complexity theory. In particular, his research focuses on the design of secure quantum computation protocols, on the study of the security of protocols in the presence of quantum adversaries and on understanding the power of random oracles. Alex received his PhD from University of Edinburgh in December 2020 and was a postdoctoral scholar at Inria Paris from January 2021 to December 2021.

Featured Publications:

1. Complexity-theoretic limitations on blind delegated quantum computation. Scott Aaronson, A. Cojocaru, Alexandru Gheorghiu, Elham Kashefi. QCrypt 2017, ICALP 2019. Available at:

2. QFactory: classically-instructed remote secret qubits preparation. A. Cojocaru, Léo Colisson, Elham Kashefi, Petros Wallden. Asiacrypt 2019. Available at:

3. Security Limitations of Classical-Client Delegated Quantum Computing. C.Badertscher,A.Cojocaru,L.Colisson,E.Kashefi,D.Leichtle,A.Mantri,P.Wallden. Asiacrypt 2020. Available at:

4. Quantum Multi-Solution Bernoulli Search with Applications to Bitcoin's Post-Quantum Security. A. Cojocaru, Juan Garay, Aggelos Kiayias, Fang Song, Petros Wallden. Quantum 2023, TPBC 2021. Available at:

5. Generalized Hybrid Search and Applications. A. Cojocaru, Juan Garay, Fang Song. Available at:

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