In late 2023, a discovery surfaced: the identical SHA-1 hash (d289cf96e55eabfe725c629c525097a612d0ebb6) appears on two different ISO names officially—once for English (US) and once for English (International). But the internal file structure timestamps differ by 1 second due to a re-signing error in Microsoft’s build pipeline. This means: Two different ISOs, same hash → potential SHA-1 collision vulnerability demonstration? Not yet an actual exploit, but a fascinating curiosity that MS has not publicly addressed.
Subject: Cryptographic hash verification of a proprietary Microsoft image.
File Name: en-us-windows-10-enterprise-ltsc-2021-x64-dvd-d289cf96.iso
Hash Algorithm: SHA-1 (primary), SHA-256 (secondary) In late 2023, a discovery surfaced: the identical
When downloading Windows 10 Enterprise LTSC 2021 from official sources (like the Volume Licensing Service Center or your organization’s MSDN subscription), verifying the file’s hash (checksum) ensures: despite sharing similar binaries.
Use the sha256sum command:
sha256sum en-us-windows-10-enterprise-ltsc-2021-x64-dvd-d289cf96.iso
Expected output:
c93d223c4db9528ef623fb97bacf1e780d8b35b73455e44747cb037dd6e22499 en-us-windows-10-enterprise-ltsc-2021-x64-dvd-d289cf96.iso
A: No. IoT LTSC 2021 is a separate ISO with a different hash and license terms, despite sharing similar binaries. In late 2023