![]() ![]() In this paper, we analyze PDF encryption and show two novel techniques for breaking the confidentiality of encrypted documents. The Portable Document Format, better known as PDF, is one of the most widely used document formats worldwide, and in order to ensure information confidentiality, this file format supports document encryption. Practical Decryption exFiltration: Breaking PDF Encryption Our research on PDF signatures and more information is also online available at. As a result, three generic CVEs for each attack class were issued. We, therefore, propose the standardization of a secure verification algorithm, which we describe in this paper.Īll findings have been responsibly disclosed, and the affected vendors were supported during fixing the issues. A possible explanation for these results could be the absence of a standard algorithm to verify PDF signatures - each client verifies signatures differently, and attacks can be tailored to these differences. We additionally evaluated eight online validation services and found six to be vulnerable. We analyzed 22 different PDF viewers and found 21 of them to be vulnerable, including prominent and widely used applications such as Adobe Reader DC and Foxit. We introduce three novel attack classes which bypass the cryptographic protection of digitally signed PDF files allowing an attacker to spoof the content of a signed PDF. In this paper, we present the first comprehensive security evaluation on digital signatures in PDFs. Several public and private services ranging from governments, public enterprises, banks, and payment services rely on the security of PDF signatures. To guarantee the authenticity and integrity of documents, digital signatures are used. ![]() The Portable Document Format (PDF) is the de-facto standard for document exchange worldwide. ![]()
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