Hasher is a Cyber Forensics tool, developed by Centre for Development of Advanced Computing, Thiruvananthapuram. This tool enables the user to verify the integrity of any file. Hashing is an extremely good way to verify the integrity of a sequence of data bits. Two files with exactly the same bit patterns should hash to the same hash value using the same hashing algorithm.

If a hash for the file stays the same, there is only an extremely small probability that the file has been changed. On the other hand, if the hashes for the file do not match, then the user can conclude that the files are not the same. Three popular hashing algorithms MD5, SHA-1 and HMAC-MD5 are included in Hasher. The time taken for calculating the hash value is also displayed.