PTK Forensics (PTK) was a non-free, commercial GUI for old versions of the digital forensics tool The Sleuth Kit (TSK).
It also includes a number of other software modules for investigating digital media.
PTK runs as a GUI interface for The Sleuth Kit, acquiring and indexing digital media for investigation.
Indexes are stored in an SQL database for searching as part of a digital investigation.
PTK calculates a hash signature (using SHA-1 and MD5) for acquired media for verification and consistency purposes.