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Earlier this month, I blogged about monitoring password-guessing attacks on a server, via a patched OpenSSH. This experiment has now been running for just over two weeks, and there are some interesting results. I’ve been tweeting these since the start. As expected, the vast majority of password-guessing attempts are quite dull, and fall into one of two categories. Firstly there are attempts with a
Many photo-sharing websites decompress and compress uploaded images, to enforce particular compression parameters. This recompression degrades quality. Some web proxies can also recompress images/videos, to give the impression of a faster connection. In Towards copy-evident JPEG images (with Markus Kuhn, in Lecture Notes in Informatics), we present an algorithm for imperceptibly marking JPEG image
The Great Firewall of China is an important tool for the Chinese Government in their efforts to censor the Internet. It works, in part, by inspecting web traffic to determine whether or not particular words are present. If the Chinese Government does not approve of one of the words in a web page (or a web request), perhaps it says “f” “a” “l” “u” “n”, then the connection is closed and the web page
TL;DR Two invitations to Cambridge (UK): 2025-03-25: the Rossfest Symposium, in honour of Ross Anderson (1956-2024) https://www.cl.cam.ac.uk/events/rossfest/ 2025-03-26 and 27: the 29th Security Protocols Workshop https://www.cl.cam.ac.uk/events/spw/2025/ Start writing, and sign up here for updates on either or both: https://forms.gle/Em9Hy43aRqrdGmd17 Rossfest Symposium 25 March 2025 The Rossfest
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