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I have Adobe acrobat 9 pro will that do it ?
... put up an encrypted one plus key to make a test.
I'm seeing several commercial packages that claim to create or decode the 256 bit encryption.
Did you try Lizzard Secure PDF viewer?
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I have produced an encrypted file for test with Adobe Acrobat X but I cannot post it as an attachment
There is a simple Adobe Acrobat reader 11.1 that will open both 128 and 256 encrypted files, free download only it foists Chrome on you.
Topic: Is there a free non-Adobe PDF-reader which can decrypt 256-bit encrypted PDFs
... Here is a test file encrypted with 256 bit encryption ... Test Card 2.pdf (72.75 kB
I wonder...Do we truly need 256 bit encryption?2128 = 3 x 1038Most of the current PCs run on the order of a giga operations per second, or a billion ops per second.Multiply that by a thousand, and one gets teraflops, or a trillion ops per second, or 1012 ops per second.So, at a teraflop, a brute force decryption would still take about 1026 seconds.And one still has a good number of years to do the calculation.
... If you restrict the search to words in a dictionary, various tenses, abbreviations, and names. One comes up with less than a million or so possibilities. Even a rather mediocre computer should be able to crack the password rather quickly.
... I took care with this one it should definitely be 256 key "openme"... P Marchese 2007.pdf (27.16 kB
there is an AES 256 bit encryption system available but it does not seem to be compatible with the Adobe Acrobat system.
It seems a bit of a pointless exorcise hunting for a non adobe decrypter when a free adobe one is available
... if you have one please publish it.