5 results about "Checksum" patented technology

The invention provides an ECU data flashing method and system. A flashing tool encrypts the key data and the ECU identification code appointed in a program to be flashed according to an appointed irreversible compression algorithm to generate a checksum and generates a flashing code according to the checksum, and when the flashing tool flashes the data, the flashing code is flashed to a specific position of an ECU memory together. An ECU reads the agreed key data and the ECU identification codes in the memory, generates the verification checksum according to the appointed irreversible compression algorithm, reads the checksum in the flash code at the specific position of the memory, judges whether the checksum is consistent with the verification checksum or not, if yes, the ECU normally runs a flash program, if not, the ECU identifies the current flashing code as the illegal flashing, and sends out an alarm prompt. The ECU flashes and verifies, so that the data security problem causedby the leakage of the ECU data and the flashing tool is avoided.

A method and system for detecting manipulation when control data are transmitted from a first control unit to a second control unit via a network, which includes generating integrity check information data for the control data transmitted by the first control unit via an integrity check generating unit on the transmitter side, calculating a cryptographic checksum for the integrity check information data generated on the transmitter side via the integrity check generating unit, transmitting the integrity check information data and the cryptographic checksum to an integrity check verifying unit that verifies the cryptographic checksum on the receiver side, generating integrity check information data on the receiver side for the control data received by the second control unit using the integrity check verifying unit, and comparing the integrity check information data and the integrity check information data with the cryptographic checksum to detect the manipulation of the transmitted control data.

In one embodiment, the present invention includes a method for receiving incoming data in a processor and performing a checksum operation on the incoming data in the processor pursuant to a user-level instruction for the checksum operation. For example, a cyclic redundancy checksum may be computed in the processor itself responsive to the user-level instruction. Other embodiments are described and claimed.

A system that stores sets of data blocks in extents located in storage devices is described. During operation, a receiving device receives, through an RPC framework, a first call asking to transfer an extent from a sending device to the receiving device. In response, the receiving device opens a port for a data connection that operates outside the RPC framework. The receiving device makes a second call, to the sending device through the RPC framework, asking to stream the extent to the port. The receiving device subsequently receives the extent from the sending device through the port and computes a checksum for the extent. The receiving device also receives a return from the second call, including a checksum for the extent computed by the sending device. If the computed checksum matches the received checksum, the receiving device returns the first call to indicate the transfer operation completed successfully.