Abstract: A system for secure communication across a network including a personal code generator having one or more identification codes and one or more encryption codes. The identification codes and the encryption codes each change at predetermined time intervals. A code server is provided and is synchronized with the personal code generator such that the code server has information regarding the current identification codes and the current encryption codes of the personal code generator. A user transmits across the communication network, the current identification codes and data encrypted with the current encryption codes and the code server uses the information regarding the current identification codes to authenticate the user and the information about the current encryption codes to decrypt the transmitted data.

Abstract: A method for generating codes for encrypting data of an encrypting device and for decrypting said data by a decrypting device. The method includes the steps of providing a personal identification code to the encrypting device, the personal identification code being known or obtainable by the decrypting device, and selecting from a set of code generation parameters a current code generation parameter. The encryption code for encrypting the data of the encrypting device is generated by an algorithm, the algorithm being a function of the current code generation parameter and the personal identification code. The current code generation parameter is either known to the decrypting device based on its position in the sequence of said code generation parameters, or is transmitted to the decrypting device such that the decrypting device can generate the encryption code using the current code generation parameter, the personal identification code and the algorithm to allow decryption of the data.