The HCS365 is a code hopping encoder designed for secure Remote Keyless Entry (RKE) and secure remote control systems. The HCS365 utilizes the KEELOQ code hopping technology, which incorporates high security, a small package outline, and low cost to make this device a perfect solution for unidirectional authentication systems and access control systems. The HCS365 combines a hopping code generated by a nonlinear encryption algorithm, a serial number, and status bits to create a secure transmission code. The length of the transmission eliminates the threat of code scanning and code grabbing access techniques.