Baran Topal

Baran Topal


May 2024
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Huge file in dropbox. CRC check?

baranbaran

I have a friend who is far away from me and needed to send a huge database backup file . She had put the 6 GB file in dropbox and we were not sure whether the file is “intact” or not.

The integrity of a file is part of the information security context and we need to know the infamous triangle of CIA, Confidentiality, Integrity and Availability. But here I skip this, you can google it.

The important part for CRC is to compare the values that you have with your peer.

You can use the FCIV hashing utility from Microsoft.  It can generate MD5 and SHA-1 hashes.
https://support.microsoft.com/en-us/kb/841290

If you have the PSCX library, you can use the Get-Hash cmdlet

I use a small free standalone program named HashMyFiles by Nir Sofer, who has written a huge number of small and very useful utility programs.
http://www.nirsoft.net/utils/hash_my_files.html