摘要:
In a microprocessor configuration, data is temporarily stored in a cache memory or a register bank. A respectively assigned cryptographic unit ensures that the data is encrypted or decrypted when the cache memory or the register bank is accessed. The keyword which is used here is changed if the cache memory or the register no longer contains any valid data to be read out. As a result, an increased protection is obtained against unauthorized monitoring of data and program sequences.
摘要:
A microcontroller for security applications includes an encryption unit between a bus and a functional unit. The encryption unit includes a gate and a key register. A memory is provided with a further encryption unit whose gate is connected between the register and the gate of the first encryption unit. As a result, the transferred information item is available in encrypted form at any point on the bus.
摘要:
A microprocessor configuration includes a data bus for data transfer between functional units. On the bus side, each unit contains an encryption/decryption unit that is controlled synchronously by a random number generator. The configuration permits a relatively high level of security against monitoring of the data transferred via the data bus, with a feasible level of additional circuit complexity.
摘要:
A shift device for shifting a first place of a data word, which consists of a plurality of places, to a second place so as to obtain a shifted data word, wherein the first place is encrypted using a first encryption parameter and wherein the second place is encrypted using a second encryption parameter, includes a unit for shifting the first place of the data word to the second place of the data word, a unit for re-encrypting the first place from an encryption using the first encryption parameter into an encryption using the second encryption pa- rameter, and a control for controlling the unit for shifting and the unit for re-encryption so that the first place is first shifted to the second place and is then re-encrypted, or that the first place is first re-encrypted and is then shifted to the second place. This ensures that data encrypted either with the first encryption parameter or with the second encryption parameter are always shifted, thus making it harder for attackers to eavesdrop on clear text data.
摘要:
A data-processing apparatus has a data provider for providing an input datum encrypted by an encryption key. In addition, the data-processing apparatus has a key stream generator for generating a key stream in a predetermined deterministic manner such that the key stream has a decryption key corresponding to the encryption key. Furthermore, the data-processing apparatus has a data processor for processing the encrypted input datum in a masked manner using the decryption key as a temporary key to obtain an output datum encrypted by an output key such that the encrypted output datum corresponds to a result, encrypted by the output key, of a predetermined operation on the encrypted input datum having been decrypted by the decryption key.
摘要:
A data-processing apparatus has a data provider for providing an input datum encrypted by an encryption key. In addition, the data-processing apparatus has a key stream generator for generating a key stream in a predetermined deterministic manner such that the key stream has a decryption key corresponding to the encryption key. Furthermore, the data-processing apparatus has a data processor for processing the encrypted input datum in a masked manner using the decryption key as a temporary key to obtain an output datum encrypted by an output key such that the encrypted output datum corresponds to a result, encrypted by the output key, of a predetermined operation on the encrypted input datum having been decrypted by the decryption key.
摘要:
In a device for determining a position of a bit error in a bit sequence, a check matrix is used which has a predefined number of rows and a predefined number of columns. The check matrix includes a plurality of square submatrices having a submatrix row number and a submatrix column number corresponding to the predefined number of rows or the predefined number of columns of the check matrix. The device for determining then includes a unit for receiving a bit sequence and a unit for identifying a syndrome using the check matrix and the received bit sequence. Furthermore, the device includes a unit for establishing a position of a bit error in the received bit sequence, wherein the unit for establishing is adapted to identify a syndrome bit and a syndrome bit group in the syndrome, and wherein the unit for establishing is further adapted to determine the position of the bit error in the received bit sequence using information on a position of the syndrome bit or the syndrome bit group in the syndrome, information on a relationship between the syndrome bit and the syndrome bit group, and a submatrix row number or a submatrix column number of a submatrix.
摘要:
A communication device for transmitting data to a communication partner device includes a transmitter for transmitting transmit data to the communication partner device, a determiner for determining a check value from the transmit data in accordance with a determination specification, a receiver for receiving a verification value from the communication partner device, and a checker configured to compare the check value with the verification value and to provide a fault indication signal as a function of the comparison.
摘要:
In a device for determining a position of a bit error in a bit sequence, a check matrix is used which has a predefined number of rows and a predefined number of columns. The check matrix includes a plurality of square submatrices having a submatrix row number and a submatrix column number corresponding to the predefined number of rows or the predefined number of columns of the check matrix. The device for determining then includes a unit for receiving a bit sequence and a unit for identifying a syndrome using the check matrix and the received bit sequence. Furthermore, the device includes a unit for establishing a position of a bit error in the received bit sequence, wherein the unit for establishing is adapted to identify a syndrome bit and a syndrome bit group in the syndrome, and wherein the unit for establishing is further adapted to determine the position of the bit error in the received bit sequence using information on a position of the syndrome bit or the syndrome bit group in the syndrome, information on a relationship between the syndrome bit and the syndrome bit group, and a submatrix row number or a submatrix column number of a submatrix.
摘要:
A shift device for shifting a first place of a data word, which consists of a plurality of places, to a second place so as to obtain a shifted data word, wherein the first place is encrypted using a first encryption parameter and wherein the second place is encrypted using a second encryption parameter, includes a unit for shifting the first place of the data word to the second place of the data word, a unit for re-encrypting the first place from an encryption using the first encryption parameter into an encryption using the second encryption parameter, and a control for controlling the unit for shifting and the unit for re-encryption so that the first place is first shifted to the second place and is then re-encrypted, or that the first place is first re-encrypted and is then shifted to the second place. This ensures that data encrypted either with the first encryption parameter or with the second encryption parameter are always shifted, thus making it harder for attackers to eavesdrop on clear text data.