MD5
File and Folder Comparator is for
comparing files as to whether or not they are
identical in content. A pair of files may be compared, or all files in two
subfolders (optionally including files in their subfolders). Comparison of files in folders may be done to display files which are the same or files which are different. A listing may be obtained of all files in a
folder (and optionally subfolders) with their
MD5 digital signatures.
MD5
File and Folder Comparator works by
comparing the
MD5 digital signatures of files (using the
MD5 message digest algorithm). The
MD5 digital signature of a
file is a sequence of 16 bytes, usually displayed as 16 hexadecimal numbers with no intervening spaces, for example, 4EAE15241AD90F85D038523E9D14DDDB. Two files whose
MD5 digital signatures are different differ themselves in at least one byte. Two files whose
digital signatures are the same are
identical in content, except where the two files have been deliberately constructed so as to have the same
digital signature. Such 'collisions' are extremely rare, and in practice two files whose
digital signatures are different are always themselves different.
Here are examples of possible uses for this program:
1. Comparing two versions of a
file as to whether they are the same or different.
2. Recording the
digital signatures of a set of files to be sent to someone else along with those files, so that they can check that the files they receive are the same as the files that were sent.
3. If you have backed up a
folder and its
subfolders to some external device and later you wish to check which files in the source
folder have changed then you can compare that
folder with the backup.
4. If you have two folders, each of which is a
backup of some other folder, you can use this program to get the average of the
file dates in each of the
backup folders, thus telling you which
backup folder is latest.
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