Networking and communication systems are meant to perform data operations to obtain data integrity in secured states. For this reason, Block Cipher and Hash Function play an important role in providing the data integrity and security. Authenticated Encryption (AE) is a technique that performs both encryption and authentication with single algorithm and aids achieving high speed implementation goal in FPGAs. For security purposes, AES-GCM circuits are utilized in many of the applications. Key-synthesized technique is described with VPNs(Virtual Private Networks).