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A message digest can also serve as a means of reliably identifying a file; several source code management systems, including Git, Mercurial and Monotone, use the sha1sum of various types of content (file content, directory trees, ancestry information, etc.) to uniquely identify them. Hashes are used to identify files on peer-to-peer filesharing ...
A file can become corrupted by a variety of ways: faulty storage media, errors in transmission, write errors during copying or moving, software bugs, and so on. Hash -based verification ensures that a file has not been corrupted by comparing the file's hash value to a previously calculated value.
Email accounts can often contain useful evidence; but email headers are easily faked and, so, network forensics may be used to prove the exact origin of incriminating material. Network forensics can also be used in order to find out who is using a particular computer [12] by extracting user account information from the network traffic.
Troubleshoot performance problems by monitoring network data from an application; Serve as the primary data source for day-to-day network monitoring and management; Spy on other network users and collect sensitive information such as login details or users cookies (depending on any content encryption methods that may be in use)
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Nmap is used for network reconnaissance and exploitation of the slum tower network. It is even seen briefly in the movie's trailer. The command Nmap is widely used in the video game Hacknet, allowing to probe the network ports of a target system to hack it. In Snowden, Nmap is used in the aptitude test scene about 14 minutes into the movie.