Method for secure communication between a first participant (10; 30) and a second participant (12; 32), - in which the first participant (10; 30) generates an item of transmit information in a first information format which can be assessed by the second participant (12; 32), - the transmit information is transferred into a second information format which can be assessed by the second participant (12; 32) and - the transmit information in the second information format is transmitted to the second participant (12; 32), wherein - the second participant (12; 32) determines an information content of the transmit information with an instruction contained in the transmit information from the transmit information present in the second information format, wherein - the second participant (12; 32) checks the instruction for plausibility/executability and only then generates an item of confirmation information which differs from the transmit information in a first information format which can be assessed by the first participant (10; 30) if the instruction is plausible/can be executed, - the confirmation information is transferred into a second information format which can be assessed by the first participant (10; 30), - the confirmation information is transmitted to the first participant (10; 30), - the first participant (10; 30) checks by using the confirmation information present in the last-mentioned information format to determine whether an information content of the confirmation information is assigned uniquely to the information content of the transmit information, - the first participant (10; 30) generates an item of release information comprising a release/authorisation for executing the instruction, in order to execute the instruction and - the release information is transmitted to the second participant (12; 32) if the information content of the confirmation information is assigned uniquely to the information content of the transmit information. - in which the first participant (10; 30) generates an item of transmit information in a first information format which can be assessed by the second participant (12; 32), - the transmit information is transferred into a second information format which can be assessed by the second participant (12; 32) and - the transmit information in the second information format is transmitted to the second participant (12; 32), wherein - the second participant (12; 32) determines an information content of the transmit information with an instruction contained in the transmit information from the transmit information present in the second information format, wherein - the second participant (12; 32) checks the instruction for plausibility/executability and only then generates an item of confirmation information which differs from the transmit information in a first information format which can be assessed by the first participant (10; 30) if the instruction is plausible/can be executed, - the confirmation information is transferred into a second information format which can be assessed by the first participant (10; 30), - the confirmation information is transmitted to the first participant (10; 30), - the first participant (10; 30) checks by using the confirmation information present in the last-mentioned information format to determine whether an information content of the confirmation information is assigned uniquely to the information content of the transmit information, - the first participant (10; 30) generates an item of release information comprising a release/authorisation for executing the instruction, in order to execute the instruction and - the release information is transmitted to the second participant (12; 32) if the information content of the confirmation information is assigned uniquely to the information content of the transmit information.