REMOTE KEYLESS ENTRY SYSTEM FOR VEHICLES (EMBODIMENTS), KEY FOB FOR REMOTE KEYLESS ENTRY SYSTEM Russian patent published in 2019 - IPC B60R25/24 G07C9/00 H04L9/06 

FIELD: physics.

SUBSTANCE: group of inventions relates to embodiments of remote keyless entry system for vehicle and key fob for this system. Proposed system comprises key fob and vehicle processor. Key fob: adds value of key fob counter; generates encrypted counter value by encryption of augmented counter key fob counter value based on encryption key; generates an encrypted value by performing an operation of bitwise XOR with respect to the encrypted counter value with the action code, the first part of the key fob counter value and the first part of the identifier code; generates plain text including a second part of the key fob counter value and a second identifier code part; generates encrypted text including encrypted value. Processor: generates the predicted total counter value based on the second part of the key fob counter value and the vehicle counter value; generates encrypted prediction using the predicted full counter value using the encryption key; generates a first part of the value of the counter of the transmitter, a first part of the code of the identifier and an action code by performing an operation of bitwise XOR with respect to the encrypted value with encrypted prediction; when the first and second parts of the counter key fob values recovered together are matched with the predicted full counter value, authorizes the key chain.

EFFECT: providing a system which increases the battery life of the key fob by reducing the size of the transmitted encrypted message.

15 cl, 1 tbl, 6 dwg