I am a professor at the computer science department of Aarhus University. In 2006-2007, a controversy started about what proofs and security reductions in cryptography actually mean and whether they are useful, a debate initiated (among others) by Koblitz and Menezes. Unfortunately, a lot of this important debate has been obscured by misunderstandings and misconceptions. In the hope of helping to clarify some of these issues, I post here my position paper on the subject, A "Proof-Reading" of Some Issues in Cryptography, which appeared in ICALP 2007. At the computer science department, I teach the following courses: The Introductory Cryptography course that runs in the fall (1.+2 .quater); and The Cryptologic Protocol Theory course that runs in the spring (3.+4. quater)。 The Course in Quantum Information Processing that runs in the fall (1.+2 .quater)。 The dSik course, an introductory course in IT security (in Danish) that runs in the spring (4. quater)。 I am currently involved with the following major research projects: CACE Computer Aided Cryptography Engineering。 CFEM Center for research in the Foundations of Electronic Markets。 ITSCI IT security for Citizens, see also the common site of this and two related projects. In day-to-day work, I am head of the Cryptography Group of the computer science department。 I am a co-founder and owner of Cryptomathic, a local software and consulting company in data security and cryptography。 I am also a co-founder of Partisia, a company doing market design and implementation, based on secure multiparty computation. papers : Giuseppe Ateniese, Özgür Dagdelen, Ivan Damgård, Daniele Venturi: Entangled Encodings and Data Entanglement. SCC@ASIACCS 2015: 3-12。 Marcin Andrychowicz, Ivan Damgård, Stefan Dziembowski, Sebastian Faust, Antigoni Polychroniadou: Efficient Leakage Resilient Circuit Compilers. CT-RSA 2015: 311-329。 Ronald Cramer, Ivan Bjerre Damgård, Nico Döttling, Serge Fehr, Gabriele Spini: Linear Secret Sharing Schemes from Error Correcting Codes and Universal Hash Functions. EUROCRYPT (2) 2015: 313-336。 Ivan Damgård, Frédéric Dupuis, Jesper Buus Nielsen: On the Orthogonal Vector Problem and the Feasibility of Unconditionally Secure Leakage-Resilient Computation. ICITS 2015: 87-104。 Ivan Damgård, Sebastian Faust, Pratyay Mukherjee, Daniele Venturi: The Chaining Lemma and Its Application. ICITS 2015: 181-196。 Ignacio Cascudo, Ivan Damgård, Bernardo Machado David, Irene Giacomelli, Jesper Buus Nielsen, Roberto Trifiletti: Additively Homomorphic UC Commitments with Optimal Amortized Overhead. Public Key Cryptography 2015: 495-515。 Eli Ben-Sasson, Iddo Ben-Tov, Ivan Bjerre Damgård, Yuval Ishai, Noga Ron-Zewi: On Public Key Encryption from Noisy Codewords. Electronic Colloquium on Computational Complexity (ECCC) 22: 94 (2015)。 Ronald Cramer, Ivan Damgård, Marcel Keller: On the Amortized Complexity of Zero-knowledge Protocols. IACR Cryptology ePrint Archive 2015: 446 (2015)。 Eli Ben-Sasson, Iddo Ben-Tov, Ivan Damgård, Yuval Ishai, Noga Ron-Zewi: On Public Key Encryption from Noisy Codewords. IACR Cryptology ePrint Archive 2015: 572 (2015)。