md5?

Discussion in 'Technical' started by jay, Apr 28, 2005.

  1. jay

    jay New Member

    Hi, I'm new to Linux. I'm currently downloading Mandrake 10.1 (the iso images). Now in the download directory I found a file called Mandrakelinux-10.1-Official-Download-CD.md5 with the following lines in it:

    Code:
    7833f17c3fbe95581c48cf3848792d21  Mandrakelinux-10.1-Official-Download-CD1.i586.iso
    5850545e8fa3f63323a90b1403ec5064  Mandrakelinux-10.1-Official-Download-CD2.i586.iso
    029f660c78e29427f775a54284fb7085  Mandrakelinux-10.1-Official-Download-CD3.i586.iso
    What is it good for?

    Thanks,

    Jay
     
  2. joe

    joe HowtoForge Supporter

    MD5 hashes are a way of verifying the integrity of a file and that no one has changed or messed with the file in any way.

    You can use the tool md5sum (installed by default on Debian) to create a hash. So for example,

    Code:
    joe@terrarum:~$ md5sum /bin/ls
    ce1243c8b432abc494b01ff36ea909ef  /bin/ls
    
    Now if I were to transfer /bin/ls to another computer, I could run the command again. If the md5sum matches, that means the file has not been tampered with and everything is fine.
     
  3. jay

    jay New Member

    Ah, I see. So after the download is finished, I type

    Code:
    md5sum Mandrakelinux-10.1-Official-Download-CD1.i586.iso
    to see if the downloaded file is an exact copy of the iso on the server, right?

    Jay
     
  4. joe

    joe HowtoForge Supporter

    You got it
     
  5. jay

    jay New Member

    Ok, thanks! :) :)
     

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