Abstract: A method, system, backend, terminal, and computer program product are disclosed for producing a secure communication channel for a terminal, the method having the following method steps. A first method step for setting up a secure communication channel between a communication partner and a backend by a communication protocol. A second method step for producing a communication channel between the communication partner and the terminal. A third method step for transmitting the channel binding information. A fourth method step for storing the channel binding information on the terminal. A fifth method step for creating a data structure and a first digital signature across the data structure y. A sixth method step for sending the data structure and the digital signature from the backend to the terminal. A seventh method step for checking authenticity of the data structure.

Abstract: A client device for the secured activation of functions of a client, a server device for providing a password for the client device, and corresponding methods. The client device has a storage unit for storing a plurality of service keys, each service key defining at least one function of the client and being allocated to a password, a receiving unit for receiving a password from a server, and a processing unit for comparing the plurality of service keys with the received password, for selecting the service key to which the received password is allocated, and for activating at least one function of the client which is contained in the selected service key.

Abstract: A method, system, backend, terminal, and computer program product are disclosed for producing a secure communication channel for a terminal, the method having the following method steps. A first method step for setting up a secure communication channel between a communication partner and a backend by a communication protocol. A second method step for producing a communication channel between the communication partner and the terminal. A third method step for transmitting the channel binding information. A fourth method step for storing the channel binding information on the terminal. A fifth method step for creating a data structure and a first digital signature across the data structure y. A sixth method step for sending the data structure and the digital signature from the backend to the terminal. A seventh method step for checking authenticity of the data structure.

Abstract: A method, system, backend, terminal, and computer program product are disclosed for producing a secure communication channel for a terminal, the method having the following method steps. A first method step for setting up a secure communication channel between a communication partner and a backend by a communication protocol. A second method step for producing a communication channel between the communication partner and the terminal. A third method step for transmitting the channel binding information. A fourth method step for storing the channel binding information on the terminal. A fifth method step for creating a data structure and a first digital signature across the data structure y. A sixth method step for sending the data structure and the digital signature from the backend to the terminal. A seventh method step for checking authenticity of the data structure.

Abstract: A device for decrypting data includes a number of devices secured by at least one security device. The secured devices include a receiver for receiving calculation data encrypted using a homomorphic encryption function and a decryptor for decrypting the encrypted calculation data by carrying out the inverse of the homomorphic encryption function on the encrypted calculation data using a private key assigned to the homomorphic encryption function. A method and a computer program product for decrypting data are also provided.

Abstract: A method, system, backend, terminal, and computer program product are disclosed for producing a secure communication channel for a terminal, the method having the following method steps. A first method step for setting up a secure communication channel between a communication partner and a backend by a communication protocol. A second method step for producing a communication channel between the communication partner and the terminal. A third method step for transmitting the channel binding information. A fourth method step for storing the channel binding information on the terminal. A fifth method step for creating a data structure and a first digital signature across the data structure y. A sixth method step for sending the data structure and the digital signature from the backend to the terminal. A seventh method step for checking authenticity of the data structure.

Abstract: A client device for the secured activation of functions of a client is disclosed. The client device has a storage unit for storing a plurality of service keys, each service key defining at least one function of the client and being allocated to a password, a receiving unit for receiving a password from a server, and a processing unit for comparing the plurality of service keys with the received password, for selecting the service key to which the received password is allocated, and for activating at least one function of the client which is contained in the selected service key. Furthermore, a server device for providing a password for a client device and corresponding methods is proposed.

Abstract: The invention relates to a device (1) for decrypting data, said device having a number of means (3-5) secured by at least one security device (2). The secured means (3-5) comprise receiving means (3) for receiving calculation data (B) encrypted using a homomorphic encryption function (f) and a decrypting means (4) for decrypting the encrypted calculation data (B) by carrying out the inverse (1) of the homomorphic encryption function (f) on the encrypted calculation data using a private key (k1) assigned to the homomorphic encryption function (f). In this manner, a secured computing environment with a high degree of security is implemented in an inexpensive manner from available standard components. The invention further relates to a method and to a computer program product for decrypting data.

Abstract: Protection program commands are inserted into at least one program command sequence of program commands in a program, to produce and check a monitoring flow marking sequence.

Abstract: The invention relates to a method for coding a data word having a prescribed quantity of arbitrary data symbols and a prescribed quantity of a reference data symbols, wherein a checksum with a prescribed quantity of cheek symbols is calculated for the data word and the quantity of arbitrary data symbols corresponds at least to the quantity of check symbols of the checksum.

Abstract: Protection program commands are inserted into at least one program command sequence of program commands in a program, to produce and check a monitoring flow marking sequence.