Posts Tagged ‘PDF decryption’

JOHN August decided to conduct an experiment. He was curious about how easy it is to crack encryption on one simple document using a fairly standard engine. So John made two files, one “simple” and one “hard”. John wondered if there were any practical ways to overcome these locks. Didier Stevens wrote a series of articles on “How to crack encrypted PDF files.” This article provides an answer to the question posed by John Augustus. Didier explains how he deciphered the “simple” encrypted PDF files in the first part. It uses the same steps as for the “simple” PDF file to crack the “hard” PDF in the second part of [...]

In this article Didier Stevens writes about his experience of recovering a PDF file encrypted by ransomware.