We have released Seghash, an open source tool that does two things:

Supported hash types: MD5, SHA1, SHA224, SHA256, SHA384, SHA512

Seghash is written in Go and released under MIT license. It works on Windows, Linux, and macOS. You can download the source and pre-built binaries from our Github account.

By releasing this open source tool we would like to encourage wide adoption of the segmented hashing algorithm by all software vendors who want to provide their users with a superior hashing option.

Segmented hashing tool

What is segmented hashing?

It is a hashing concept created by our company and implemented in Atola Insight Forensic.

With regular hashing, you get a single hash for the entire image.

With segmented hashing, you end up with many hashes of corresponding LBA ranges (chunks) of the image. The sum of these LBA ranges represents the entire image, just not necessarily in sequential order. By validating all hashes in a set, you can still prove that the entire image was not modified.

All segment hashes are saved in a CSV file with the following simple format:

Hash,start LBA,end LBA



… And so on until the last LBA.


Vitaliy Mokosiy
Categories: Open source

Vitaliy Mokosiy

Atola CTO He believes in saving time & energy of people doing mission-critical work. Therefore, all his efforts are focused on leading R&D of innovative Atola products. Gamification enthusiast. Agile development proponent.

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