Method for recognizing manipulation during the transmission of control data from a first control unit to a second control unit via a network, comprising the following steps: (a) generation of integrity check information data (IPID) on the transmitter side for the control data that is transmitted by the first control unit by means of an integrity check generating unit (IPEE), wherein the control data is transmitted unencrypted in control data packets which comprise packet administration data and useful data and wherein the generated integrity check information data (IPID) is formed by a hash value of at least part of the control data and/or the packet administration data contained in a control data packet or in a particular number of control data packets; (b) calculation of a cryptographic checksum for the integrity check information data (IPID) generated on the transmitter side by means of the integrity check generating unit (IPEE) using a cryptographic key; (c) transmission of the integrity check information data (IPID) generated on the transmitter side and the corresponding cryptographic checksum that is calculated by the integrity check generating unit (IPEE) to an integrity check verifying unit (IPVE) which verifies the cryptographic checksum on the receiver side using a cryptographic key; (d) generation of integrity check information data (IPID') on the receiver side for the control data that is received by the second control unit using the integrity check verifying unit (IPVE); and (e) comparison of the integrity check information data (IPID') generated on the receiver side by the integrity check verifying unit (IPVE) and the integrity check information data (IPID) which is generated on the transmitter side and which is received together with the cryptographic checksum which is verified by the integrity check verifying unit (IPVE) in order to detect manipulation of the transmitted control data. (a) generation of integrity check information data (IPID) on the transmitter side for the control data that is transmitted by the first control unit by means of an integrity check generating unit (IPEE), wherein the control data is transmitted unencrypted in control data packets which comprise packet administration data and useful data and wherein the generated integrity check information data (IPID) is formed by a hash value of at least part of the control data and/or the packet administration data contained in a control data packet or in a particular number of control data packets; (b) calculation of a cryptographic checksum for the integrity check information data (IPID) generated on the transmitter side by means of the integrity check generating unit (IPEE) using a cryptographic key; (c) transmission of the integrity check information data (IPID) generated on the transmitter side and the corresponding cryptographic checksum that is calculated by the integrity check generating unit (IPEE) to an integrity check verifying unit (IPVE) which verifies the cryptographic checksum on the receiver side using a cryptographic key; (d) generation of integrity check information data (IPID') on the receiver side for the control data that is received by the second control unit using the integrity check verifying unit (IPVE); and (e) comparison of the integrity check information data (IPID') generated on the receiver side by the integrity check verifying unit (IPVE) and the integrity check information data (IPID) which is generated on the transmitter side and which is received together with the cryptographic checksum which is verified by the integrity check verifying unit (IPVE) in order to detect manipulation of the transmitted control data.