I didn't see the original post but the topic came up in 2005 here in the UK as the banks here wanted to use BGP filtering in the same light. The LINX prepared a paper on the issues with BGP blackholing and recommended that if the banks want to trade on the Internet that they should introduce authentication systems that are fit for purpose (SecureID for example (many banks had already done this)). I will try and find a link to the paper that was prepared. After we presented the paper the idea was not taken forward. Unfortunately since then an alternative technology route to do filtering in proxies and transparent caches has appeared on the scene and even more so the government here in the UK has been convinced by mad^wmarketing people and is now under the false impression that "it is now technically possible to filter the Internet". The aim of this filtering is an admirable one for sure but the platform fundamentally doesn't work and even more worryingly ideas are now being muted to filter other content such as terrorism, phishing etc. Regards, Neil.