TLSH is a fuzzy matching library. Given a byte stream with a minimum length of 256 bytes, TLSH generates a hash value which can be used for similarity comparisons. Similar objects will have similar hash values which allow for the detection of similar objects by comparing their hash values. Note that the byte stream should have a sufficient amount of complexity. For example, a byte stream of identical bytes will not generate a hash value.
The computed hash is 35 bytes long (output as 70 hexadecimal characters). The first 3 bytes are used to capture the information about the file as a whole (length, ...), while the last 32 bytes are used to capture information about incremental parts of the file.
DISCLAIMER: Based on Trendmicro's TLSH and work of glaslos Go port tlsh.
$ gem install tlsh
Computing a diff between two files
> Tlsh.diff_files('./../fixtures/test_file_1', './../fixtures/test_file_2')
=> 501
Getting a hash of a file
> tlsh = Tlsh.hash_file('./../fixtures/test_file_1', './../fixtures/test_file_2')
=> 501
> tlsh.string.to_s
=> "b2317c38fac0333c8ff7d3ff31fcf3b7fb3f9a3ef3bf3c880cfc43ebf97f3cc73fbfc"
Getting a hash of bytes
> Tlsh.hash_bytes([11,4,...2])
=> #<Tlsh::TlshInstance:0x007fddf7cf7f60 @checksum=77, @l_value=13, @q1_ratio=1, @q2_ratio=2, @q_ratio=18, @code=[113, 234, 243, 233, 185, 240, 180, 207, 123, 159, 195, 238, 7, 74, 14, 114, 59, 50, 55, 62, 226, 73, 19, 139, 133, 104, 235, 187, 195, 173, 42, 122]>
Bug reports and pull requests are welcome on GitHub at https://github.com/[adamliesko]/tlsh. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the MIT License.
Everyone interacting in the Tlsh project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.
FAQs
Unknown package
We found that tlsh demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
PyPI confirms no security flaws were exploited in the Ultralytics supply chain attack and highlights improvements for safer package publishing.
Security News
Research
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
Research
Security News
Attackers used a malicious npm package typosquatting a popular ESLint plugin to steal sensitive data, execute commands, and exploit developer systems.