How to check if the copy is 1:1 from msdna?

Discussion in 'Chit Chat' started by biegalson, Aug 19, 2015.

  1. biegalson

    biegalson MDL Novice

    Aug 23, 2014
    11
    0
    0
    Is there any other option besides checking the sha-1 checksum if the uploaded image is the exact copy from msdna ? Or is the sha-1 enough to 100% say its the same?
     
  2. MrMagic

    MrMagic MDL Guru

    Feb 13, 2012
    5,837
    3,924
    180
    Even if 1 bit is changed, the hash will change, so you can 110% rely on the hash

    That's the whole point of hashes
     
  3. biegalson

    biegalson MDL Novice

    Aug 23, 2014
    11
    0
    0
    Thanks I just wanted to be sure that u cant fake it :p
     
  4. MrMagic

    MrMagic MDL Guru

    Feb 13, 2012
    5,837
    3,924
    180
    Nope, no chance of faking it
     
  5. Yen

    Yen Admin
    Staff Member

    May 6, 2007
    11,252
    11,071
    340
    You can create a different data set with the same sha1. Professor Wang did just that and found a different data stream with an identical finger print that matches the SHA-1 hash of the original data stream.

    But you cannot alter an existing data set without to change its functionality and/or file size.
    If file size and functionality is the same then you can be 100% sure.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  6. biegalson

    biegalson MDL Novice

    Aug 23, 2014
    11
    0
    0
    what would you say about Windows 7 Ultimate x86/x64 ISO Download from bjorn96 (C6620AE85D42FCA40C202B68C0E7124BC0EDA7C2*pl_windows_7_ultimate_with_sp1_x64_dvd_u_677341.iso)

    and
    pl_windows_xp_professional_with_service_pack_3_x86_cd_vl_x14-74003.iso

    or
    pl_windows_xp_professional_with_service_pack_3_x86_cd_x14-80476.iso

    from


    SmartVersion patch's conversions Windows XP EN2XX from LostED

    i checked the hashes and they match so I assume its safe to download them?

    and could you explain me what
    [h=2]SmartVersion patch's conversions Windows XP EN2XX means?[/h]
     
  7. Yen

    Yen Admin
    Staff Member

    May 6, 2007
    11,252
    11,071
    340
    Maybe LostED can add his comments on that.
    Same hash and same file size=same content. There are two pro licenses VolumeLicense and retail.
    Also there are w7 ultimate SP1 ISOs with media refresh (Windows ISO's include the KB2534111 update) and without.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...