Remote keyless entry message authentication

Method and apparatus are disclosed for remote keyless entry authentication. An example remote keyless entry system includes a key fob and a vehicle. The key fob generates a secured message with a plaintext space and a ciphertext space. The vehicle (i) determines whether the key fob may be authorized based on first information in the plaintext space, (ii) decrypts an encrypted value in the ciphertext space based on a predicted full counter value, and (iii) determines whether the key fob is authorized based on second information in the encrypted value. 本发明公开了用于远程无钥匙进入认证的方法和设备。种示例远程无钥匙进入系统包括密钥卡和车辆。密钥卡生成具有明文空间和密文空间的安全消息。车辆(i)基于明文空间中的第信息来确定密钥卡是否可以被授权，(ii)基于预测到的完整计数器值来解密密文空间中的加密值，以及(iii)基于加密值中的第二信息来确定密钥卡是否被授权。