Security has become an increasingly important feature with the growth of electronic communication. The Symmetric, or secret key algorithms, a cryptography method in which the same key value is used in both the encryption and decryption calculations are becoming more popular. The keys, in practice, represent a shared secret between two or more users that can be used to maintain a private information link. Secret key cryptography uses conventional algorithm that is Advanced Encryption Standard (AES) algorithm. The AES algorithm is capable of using cryptographic keys of 128, 192, and 256 bits to encrypt and decrypt data in blocks of 128 bits. This standard is based on the Rijndael algorithm. All the modules are compared with different families of FPGA platforms.