As every file on a computer is, ultimately, just data that can be represented in binary form, a hashing algorithm can take that data and run a complex calculation on it and output a fixed-length string as the result of the calculation. These algorithms essentially aim to produce a unique, fixed-length string – the hash value, or “message digest” – for any given piece of data or “message”. Hashes are the output of a hashing algorithm like MD5 (Message Digest 5) or SHA (Secure Hash Algorithm). In this post, we’ll take a look at some of those as we explore what a hash is and how it works. ![]() Some legacy AV solutions rely on them almost exclusively for detection purposes, but even though that is a rather limited and easily defeated way to detect modern malware, hashes still have great value for establishing identity and are used in many different ways. These long strings of apparently random numbers and letters are generated and used in several important ways. ![]() ![]() One concept that you will meet time and time again in any discussion of cybersecurity is the concept of a hash.
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