![]() In theory, companies use encrypted PDFs to transfer data through an unsecured or untrusted channel - for example, to upload a file to cloud storage that many people have access to. Fabian Ising of Münster University of Applied Sciences presented their conclusions - and they were disappointing. Continuing the study of PDF security, a team of researchers from several German universities tested how reliable the encryption implementation in this format is. Therefore - at least, in theory - whoever encrypts a PDF file can be sure that only someone who has the password can see what’s in the file. According to the file format’s specifications, PDF supports encryption, using the AES algorithm with Cipher Block Chaining encryption mode.
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