Effect of Security Increment to Symmetric Data Encryption through AES Methodology

The selective application of technological and related procedural safeguards is an important responsibility of every organization in providing adequate security to its electronic data systems. Protection of data during transmission or while in storage may be necessary to maintain the confidentiality and integrity of the information represented by the data. The algorithm uniquely defines the mathematical steps required to transform data into a cryptographic cipher and also to transform the cipher back to the original form. Data encryptions standard (DES) use 64 bits block size as well as 64 bits key size that are vulnerable to brute-force, attack. But for both efficiency and security, a larger block size is desirable. The advanced encryption standard (AES,) that uses 128 bit block size as well as 128 bits key size was introduced by NIST In this paper, we showed the effect in security increment through AES methodology. To do this, we propose an algorithm which is higher secure than Rijndael algorithm (by comparing the key size) but less efficient than that. The difference of efficiency between Rijndael and our propose algorithm is very negligible. We explain all this term in this paper.