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um my name is vladislav mladna for just vladi if you have some questions to me and this is fabian and we are allowed today to talk about how to break pdf security or more special about how to break the cryptography operations in pdf files we are a large team from university on bohom minster and hackman gamberha so um as i mentioned we will talk about cryptography in pdf files does it work all right okay lets try that again okay perfect this talk will consist of two parts the first part is about digitally signed pdf files and how can we recognize such files if we open them we see the information regarding the that the file was signed and all verification procedures were valid and more information regarding the signature validation panel and information about who signed this file this is the first part of the talk and i will present this topic and the second part is regarding pdf encrypted files and how can we recognize such files if we you try to open such files the first thing you se