It is a group of two comparative hash capabilities, with various block sizes, known as SHA-256 and SHA-512. The essential distinction between SHA-256 and SHA-512 is the word size; SHA-256 purposes 32-byte words though SHA-512 purposes 64-byte words.for secure PC exchanges. Hashing calculations have for quite some time been the poor-man of the local area, with their security getting less consideration than standard encryption calculations and with little consideration paid to their speed. The assaults against SHA-1 switched this present circumstance and numerous new proposition are being assessed accordingly to the NIST SHA-3 rivalry. In the outcome of the SHA-1 goes after the guidance NIST created was to move to SHA-256 . Accordingly, numerous guidelines and items have begun to move towards bigger hash sizes, in spite of the fact that this might be a fairly extended process as the SHA-3 rivalry currently adds extra aspects to highlight determination and future acceptability issues. This development doesn't come without its expenses as SHA-256 is around 2.2 times more slow than SHA-1. The justification for why SHA-512 is quicker than SHA-256 on 64-digit machines is that has 37.5% less adjusts per byte (80 adjusts working on 128 byte blocks) contrasted with SHA256 (64 rounds working on 64 byte blocks), where the tasks utilize 64-bit whole number math. The reception across the expansiveness of our item scope of 64 bit ALU's make it conceivable to accomplish better security utilizing SHA-512 quicker than it takes to register a SHA-256 hash.