In today‟s world, it is common to first convert (encode) our message of varying length into some message form of constant length and then use this converted message for generating digital signatures or in other cryptographic applications. The fixed length message generated is generally referred to as message digest. The algorithm used for such conversion must be designed in such a manner that it does not generate same digest for two different messages otherwise we can‟t guarantee the authenticity of the original message. What we do in this type of algorithms is to compress the message and keep on compressing it unless it generates such a fixed length message that is unique for each of the possible messages. Most of such algorithms which were designed earlier and were considered to be secure have now become completely obsolete as they have been cracked due to the increasing processing and computing capacities. In order to ensure that the algorithm designed in today‟s time for generating a digest from a varying length message survives the attacks that might become possible due to the increasing processor capacities, it has become necessary that the functions used in the algorithm are safe and fast to calculate and the generated message length must also be of reasonable size. Bigger digest length with better encoding functions ensure more security from different types of attacks. In this paper, we are going to discuss and describe the design of SHA-2 algorithm using 640 bits, the possible benefits that one might get through this approach and its applications. © 2016, International Journal of Pharmacy and Technology. All rights reserved.