Bypass decryption key mega1/24/2024 Downloading copyrighted materials from streaming services may violate their Terms of Service. This PoC was done to further show that code obfuscation, anti-debugging tricks, whitebox cryptography algorithms and other methods of security-by-obscurity will eventually by defeated anyway, and are, in a way, pointless. Tip If you increase your ‘Max Parallel downloads,’ you will increase your speed. Under the ‘Download’ tab, click on Change It to specify where you want your files to download. Step 3 Set your download location by clicking on EDIT > SETTINGS. Some reversing job on that binary can then be done to extract the secret keys and mimic the key decryption algorithm from the license response. Step 2 Open the MegaBasterd executable file. This binary is usually heavily obfuscated and makes use of third-party solutions that claim to offer software “protection” such as Arxan or Whitecryption. Step 5: Turn off VPN and resume download. Step 1: Download SetupVPN (extension) Step 2: Download file and wait until it caps out (1.5 GB) Step 3: Turn on the VPN (free), doesnt matter where (I use Netherlands because its the first one) Step 4: Resume the Download and then Pause. In the context of browsers the actual decryption of the media is usually done inside a proprietary binary (widevinecdm.dll, known as the Content Decryption Module or CDM) only after receiving the license from a license server with an encrypted key in it. This works on Chrome, dont know if it works on other stuff. NOTE: The extension currently supports the Windows platform only. WidevineDecryptor: Found key: 100b6c20940f779a4589152b57d2dacb (KID=eb676abbcb345e96bbcf616630f1a3da)ĭecrypting the media itself is then just a matter of using a tool that can decrypt MPEG-CENC streams, like ffmpeg.įfmpeg -decryption_key 100b6c20940f779a4589152b57d2dacb -i encrypted_media.mp4 -codec copy decrypted_media.mp4 Keys will be logged in plaintext to the javascript console. To see this concept in action, just load the extension in Developer Mode and browse to any website that plays Widevine-protected content, such as. This Chrome extension demonstrates how it’s possible to bypass Widevine DRM by hijacking calls to the browser’s Encrypted Media Extensions (EME) and decrypting all Widevine content keys transferred – effectively turning it into a clearkey DRM. Widevine is a Google-owned DRM system that’s in use by many popular streaming services (Netflix, Spotify, etc.) to prevent media content from being downloaded.īut Widevine’s least secure security level, 元, as used in most browsers and PCs, is implemented 100% in software (i.e no hardware TEEs), thereby making it reversible and bypassable.
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