From 84f210edd9e72a65ca8b034a0d3bbc12e506c580 Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Sun, 17 Sep 2000 20:11:59 +0000 Subject: [PATCH] - Included authentication scheme from protocol.c - Added a few comments about the symmetric cipher. --- doc/SECURITY | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/doc/SECURITY b/doc/SECURITY index a885b46d..8ac8dc3c 100644 --- a/doc/SECURITY +++ b/doc/SECURITY @@ -12,12 +12,35 @@ This is the security documentation for tinc, a Virtual Private Network daemon. provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. - $Id: SECURITY,v 1.1.2.1 2000/09/17 19:57:39 guus Exp $ + $Id: SECURITY,v 1.1.2.2 2000/09/17 20:11:59 guus Exp $ 1. Authentication ------------------ +The authentication protocol (see protocol.c for the up-to-date version) is: + + Client Server + send_id(u) + send_challenge(R) + send_chal_reply(H) + send_id(u) + send_challenge(R) + send_chal_reply(H) + --------------------------------------- + Any negotations about the meta protocol + encryption go here(u). + --------------------------------------- + send_ack(u) + send_ack(u) + --------------------------------------- + Other requests(E)... + + (u) Unencrypted, + (R) RSA, + (H) SHA1, + (E) Encrypted with symmetric cipher. + Authentication in tinc will be done in a way that is very similar to the way the SSH (Secure SHell) authentication protocol works. It is based on public key cryptography. @@ -90,3 +113,11 @@ Other options for key exchange could be: them must be done with great care, nobody may eavesdrop. Exchanging public keys on the other hand is much safer, everybody may eavesdrop, just as long as you are sure that the public key itself belongs to the right owner. + +3. Symmetric cipher +-------------------- + +Since the generalized encryption functions of OpenSSL are used, any symmetric +cipher that is available in OpenSSL could possibly be used. The default however +will be Blowfish. Blowfish is widely in use and still has not been cracked +today (as far as we know). It also is one of the faster ciphers available. -- 2.39.5