![]() Developers brought back the key stretching algorithmĪnd made it a serious barrier to password recovery. The latest versions of the Adobe PDF format offer improvements on earlier versions. Recovery Speed: User Password to PDF created in Adobe Acrobat X-XI Passwords to any type of protected Adobe PDF file. In a nutshell, Accent PDF Password Recovery leverages all the processor’s available resources to deliver top speeds when recovering The i7-860, which only has support for SSE2. That’s why the CPU i7-4770 with AVX2 runs so much faster than Because of that oversight, any processor with SIMD instructions orĪVX2 technology recovers this type of password at impressive speeds. They also decided not to decrypt the key. The developers decided not to use key stretching, replacing 50 iterations of MD5 with a single (That’s actually the whole idea.)īut Acrobat 9 contained a serious mistake. ![]() When a password is entered, the key must be “stretched” by running it through the exact same number of hash or encryption iterationsīefore the file contents can be decrypted.ĭuring password recovery, the key stretching algorithm is what takes up the most time. ![]() Sometimes the post-hash key is even further encrypted. Most of the time, programs generate encryption keys for their documents by running an original key through special hash algorithms dozens Recovery Speed: Document open password for Adobe PDF 1.7 ExtensionLevel 3 However, the developers made some mistakes and the password recovery speed MD5 hash algorithm was replaced with the newer SHA-256. The encryption key was boosted to 256 bits and the Recovery Speed: Document open password for Adobe PDF 1.4-1.7 Recovery Speed: User Password to PDF created in Adobe Acrobat 9Īdobe Acrobat 9 introduced a new format, Adobe PDF 1.7 E元, with improved security. These reinforcements seriously affect password recovery speeds for Adobe PDF 1.4 - 1.7 files. Subsequent PDF versions included significant changes to file protection: in addition to the RC4 algorithm, these files have blockĪES with a 128-bit key and the algorithm for computing the key was reinforced (MD5 + RC4 were replaced with 50xMD5 + 20xRC4). Recovery Speed: Document open password for Adobe PDF 1.1-1.3 Recovery Speed: User Password to PDF created in Adobe Acrobat 5-8 Means that we can attack both the password and the encryption key.Īs a result, Accent PDF Password Recovery shows its highest speeds recovering passwords to Adobe PDF 1.1 - 1.3 files. ![]() By today’s standards, RC4 has a short 40-bit key. Recovery Speed: User Password to PDF created in Adobe Acrobat 2-4Įarly versions of the Adobe PDF format used the RC4 algorithm for encryption. Password recovery speed depends to a great extent on these algorithms. Processors, and we’re going to share those numbers with you.īefore you look at our test results, you should know that there are multiple versions of the Adobe PDF format, and each version has its We speed tested Accent PDF Password Recovery for every existing version of the PDF format on computers with a wide range of Now it’s time we show you the data to prove it. We’re so excited about Accent PDF Password Recovery that we’ve been telling everyone how our solutionįor recovering passwords to PDF files runs at top speeds and supports any type of PDF.
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