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Modern block ciphers are widely used to provide encryption of a relational database including cryptographic checksum and ensures if the contents are not being altered in the system. The application of block cipher in the cryptography makes the process comparatively quick, and each messages stored in a block is encrypted or decrypted with the requirement. The most symmetric block ciphers are based on a Feistel Cipher Structure. Fiestel refers to an n- bit general substitution as an ideal block cipher, because it allows for the maximum number of possible encryption mappings from the plain text to cipher text block. It is the most widely used private key block cipher. It was adopted in 1977 by the National Bureau of Standards as Federal Information Processing standard 46(FIPS PUB 46). Although DES standard is public it has a controversy over its design. This is the due to the reason that, the design criteria were classified, and has a choice of 56- bit key. The proposed DES was subjected to intense and continuing criticism over the size of its key and the classified design criteria. DES is widely used in financial applications in current time and also regarded as a stereotype system which is persisting to continue legacy, and has been updated with AES or triple DES for futuristic applications.