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Welcome to Rolf Oppliger’s CRYPTOLOGY Blog. The aim of this blog is to provide a platform that allows you to ask any question related to cryptology that is of interest to you and may be of interest to your colleagues, as well. You can either leave your question as a comment to the CALL FOR QUESTIONS post in the “Questions and Answers” section or e-mail it to cryptolog@esecurity.ch. In either case, I will try to answer the question as good as I can. I may also provide some extracts from my books for download (depending on the question). In either case, I am looking forward hearing from you and learning your questions. They are highly appreciated!