[Clips] nym-0.2 released (fwd)

--- begin forwarded text Delivered-To: clips@philodox.com Date: Fri, 30 Sep 2005 23:10:27 -0400 To: "Philodox Clips List" From: "R.A. Hettinga" Subject: [Clips] nym-0.2 released (fwd) Reply-To: rah@philodox.com Sender: clips-bounces@philodox.com --- begin forwarded text Delivered-To: cryptography@metzdowd.com Date: Sat, 1 Oct 2005 02:18:55 +0000 (UTC) From: Jason Holt To: cryptography@metzdowd.com Subject: nym-0.2 released (fwd) Sender: owner-cryptography@metzdowd.com ---------- Forwarded message ---------- Date: Sat, 1 Oct 2005 02:18:43 +0000 (UTC) From: Jason Holt To: or-talk@seul.org Subject: nym-0.2 released nym-0.2 is now available at: http://www.lunkwill.org/src/nym/ My tor server is currently down, so I can't set up a public trial of this, but perhaps someone else will. This release makes the following improvements: * Tokens are now issued one-per-IP to clients via a "token" CGI script. Tokens are still blindly issued, so nobody (including the token issuer) can associate tokens with IP addresses. The list of already-served IPs could be periodically removed, allowing users to obtain new pseudonyms on a regular basis. (Abusers will then need to be re-blocked assuming they re-misbehave). * A token can be used to obtain a signature on a client certificate from a separate "CA" CGI script (potentially on a different machine). Tokens can only be "spent" to obtain one cert. Code to make a CA, client certs and have the certs signed is included. * The CA public key can be installed on a third web server (or proxy) to require that users have a valid client certificate. Servers can maintain a blacklist of misbehaving client certs. Misbehavers will then be unable to access the server until they obtain a new token and client cert (via a new IP). My proposal for using this to enable tor users to play at Wikipedia is as follows: 1. Install a token server on a public IP. The token server can optionally be provided Wikipedia's blocked-IP list and refuse to issue tokens to offending IPs. Tor users use their real IP to obtain a blinded token. 2. Install a CA as a hidden service. Tor users use their unblinded tokens to obtain a client certificate, which they install in their browser. 3. Install a wikipedia-gateway SSL web proxy (optionally also a hidden service) which checks client certs and communicates a client identifier to MediaWiki, which MediaWiki will use in place of the REMOTE_ADDR (client IP address) for connections from the proxy. When a user misbehaves, Wikipedia admins block the client identifier just as they would have blocked an offending IP address. -J --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majordomo@metzdowd.com --- end forwarded text -- ----------------- R. A. Hettinga The Internet Bearer Underwriting Corporation http://www.ibuc.com/ 44 Farquhar Street, Boston, MA 02131 USA "... however it may deserve respect for its usefulness and antiquity, [predicting the end of the world] has not been found agreeable to experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire' _______________________________________________ Clips mailing list Clips@philodox.com http://www.philodox.com/mailman/listinfo/clips --- end forwarded text -- ----------------- R. A. Hettinga The Internet Bearer Underwriting Corporation http://www.ibuc.com/ 44 Farquhar Street, Boston, MA 02131 USA "... however it may deserve respect for its usefulness and antiquity, [predicting the end of the world] has not been found agreeable to experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'