2results about How to "Increase attack difficulty" patented technology

This invention discloses a method for updating a vehicle-mounted ECU security key and a computer storage medium. The method includes: an upper-level computer using the ECU's public key to perform asymmetric encryption on a business key to obtain ciphertext; signing the ciphertext using the upper-level computer's private key; concatenating and packaging the ciphertext, signature, and upper-level computer public key and sending it to the ECU; the ECU unpacking the received data to obtain the ciphertext, signature, and upper-level computer public key; verifying the upper-level computer public key; if the verification is successful, verifying the signature using the upper-level computer public key; if the signature verification is successful, decrypting the ciphertext using the ECU's private key; updating the vehicle-mounted ECU security key based on the decryption result; if either the upper-level computer public key or signature verification fails, sending a key update failure message to the upper-level computer and ending the ciphertext update. This invention features a simple algorithm and avoids the risk of brute-force key reading at the ECU, thus improving the security of in-vehicle terminal information.

The application discloses a GNSS anti-spoofing method and system for multi-constellation ionospheric delay adaptive detection, and belongs to the technical field of satellite navigation. The method comprises the following steps: extracting effective dual-frequency pseudorange data in different constellations from observation data according to signal types; calculating ionospheric delay values of each satellite in each constellation based on preset frequency ratio factors of each constellation; assigning a sliding window buffer to each satellite, dynamically generating a detection threshold interval; judging the signal abnormal state of the current satellite, and counting the number of continuous abnormalities to obtain a single-satellite abnormality preliminary determination result; based on the single-satellite abnormality preliminary determination result, counting the proportion of abnormal satellites in each constellation and the number of continuous abnormalities of each satellite, performing global abnormality judgment, and generating an alarm information when the judgment is triggered. The application improves the robustness, environmental adaptability and reliability of GNSS anti-spoofing detection through multi-constellation joint detection, sliding window adaptive threshold and abnormal value filtering mechanism, and does not need to increase the hardware cost.