Elliptic Curve Cryptography (ECC) can be used as a tool for encrypting data, creating digital signatures or performing key exchanges. In relation to encryption, the Elliptic Curve Integrated Encryption Scheme (ECIES) is the best known scheme based on ECC, and as such it has been included in several cryptographic standards. In the present work, we provide an extensive review and comparison of the versions of ECIES included in documents from ANSI, IEEE, ISO/IEC, and SECG, highlighting the main differences between them that can prevent implementations of ECIES from being fully interoperable.This work has been partially supported by Ministerio de Ciencia e Innovación (Spain), under the grant TEC2009-13964-C04-02, and Ministerio de Industria, Turismo y Comercio (Spain), in collaboration with CDTI and Telefónica I+D, under the project Segur@ CENIT-2007 2004.Peer reviewe
