Abstract: A communication system for initiating a transaction between a first communication device and a second communication device is disclosed. In an embodiment, one the first and second communication devices generates a transaction initiation code and transmits the transaction initiation code to the other one of the first and second communication devices and at least one of the first and second communication devices outputs output information based on the transaction initiation code to a user. One of the first and second communication devices receives user information from the user, and for initiates the transaction between the first and the second communication device if compatibility is discovered between the transaction initiation code and the user information.

Abstract: A communication system (100) for initiating a transaction between a first communication device (101) and a second communication device (102), the communication system (100) comprising the first communication device (101) and the second communication device (102), wherein one of the first and second communication devices (101, 102) is adapted for generating a transaction initiation code and for transmitting the transaction initiation code to the other one of the first and second communication devices (102, 101), wherein at least one of the first and second communication devices (101, 102) is adapted for outputting output information based on the transaction initiation code to a user, wherein one of the first and second communication devices (101, 102) is adapted for receiving user information from the user, and for initiating the transaction between the first and the second communication device (101, 102) if compatibility is discovered between the transaction initiation code and the user information.

Abstract: Provided in a circuit (8) for a data carrier (7) are a circuit part (12), which requires a relatively large amount of energy, and at least part of a contact interface (11) via which the circuit part (12) can be supplied with electrical energy, which circuit part (12) is designed to process data signals (DS1, DS2) in a normal-consumption processing mode and in an energy-saving processing mode in which less energy is required than in the normalconsumption processing mode, and which circuit part (12) can be switched into the energysaving processing mode when energy is being supplied via the contact interface (11) and which circuit part (12) can be switched, with the aid of a first mode change signal (MC 1) that can be fed thereto, from the energy-saving processing mode into the normal-consumption processing mode, and further provided in this circuit (8) is at least part of a contactless interface (23) via which a carrier signal (TS) can be received by the circuit (8), and furthermore provided in this circuit (8)

Abstract: Provided in a circuit (8) for a data carrier (7) are a circuit part (12), which requires a relatively large amount of energy, and at least part of a contact interface (11) via which the circuit part (12) can be supplied with electrical energy, which circuit part (12) is designed to process data signals (DS1, DS2) in a normal-consumption processing mode and in an energy-saving processing mode in which less energy is required than in the normalconsumption processing mode, and which circuit part (12) can be switched into the energysaving processing mode when energy is being supplied via the contact interface (11) and which circuit part (12) can be switched, with the aid of a first mode change signal (MC 1) that can be fed thereto, from the energy-saving processing mode into the normal-consumption processing mode, and further provided in this circuit (8) is at least part of a contactless interface (23) via which a carrier signal (TS) can be received by the circuit (8), and furthermore provided in this circuit (8)