Abstract
An overview of measures used to ensure data integrity in German and international payment systems will be given. While symmetrical cryptographic algorithms are mainly used in national electronic cash system or in electronic purse, asymmetrical procedures are in use in international systems in order to simplify the key management. The descriptions of the payment systems are kept short and focus merely on some measures to ensure integrity and process control. They are not suitable to give a complete description of the overall system security. It is assumed that the reader knows, how an asymmetrical cryptographic algorithm works and is acquainted with the various operation modes of a symmetrical asymmetrical cryptographic (here Triple-DES).Key wordsauthenticationcryptographyencryptionelectronic purseelectronic cashEMVhash valueintegrity mechanismskey managementmessage authentication codePINRSASecure Messagingsecurity evaluation criteriasmart cardsecurity module
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