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This is the BSDA Study Guide Book written via a wiki collaboration. This is a work in progress. You may contribute to or discuss this specific page at http://bsdwiki.reedmedia.net/wiki/Verify_a_file__39__s_message_digest_fingerprint___40__checksum__41__.html. Verify a file's message digest fingerprint (checksum) Concept Be familiar with the theory behind a message digest fingerprint and why it is important to verify a file's fingerprint. In addition, be able to create a fingerprint as well as verify an existing fingerprint. Introduction When you download some file from a server and you don't trust this server how can you verify that file is real, without any bogus parts? You can use fingerprint of this file for verify it. Examples You download file from some mirror in your country and want to verify it. Let's do it. > md5 file MD5 (file) = d3762ac7a4e45f8262aeb3362bb1f9b7 > sha1 file SHA1 (file) = 67d59b7fe01074dba2462e13633bd163453bff47 Now we have fingerprint for file and can verify md5 and sha1 fingerprint from server. TODO: show same with "openssl" and mention other digest types? TODO: briefly mention cksum, checksums and block counts Practice Exercises Get few fingerprints from your system via md5 and sha1 More information md5(1), openssl(1), sha1(1), cksum(1)