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hello everyone welcome to the talk on how to break pdf encryption my name is jens miller i'm a phd candidate at the chair of networking data security at the university of bohol and today i will give you an introduction to our research which is joint work with the university of applied sciences in munster on security force in the pdf encryption standard which we call pdf acceleration or pdfx now what is pdf x some of you may have heard about it it's yet another attack that comes with a logo and pdfx introduces two novel attacks on pdf encryption which i'm going to present today those are weaknesses in the pdf standard and both were actually found by carefully reading the standard one based on flaws in the pdf data format structure which allows for partial encryption we call this attack direct exfiltration the other one is based on actual crypto so on flaws in the us block cipher modes of operation we call this attack mobility gadgets here's an outline of today's talk first i'm going to...
