On Tue, 15 May 2007 08:58, rjh at sixdemonbag.org said: > Cf. Thompson, K. _Reflections on trusting trust_. Comm. ACM 27, 8 > (Aug. 1984), 761-763. David Wheeler recently published a paper which explains how to overcome this problem: Countering Trusting Trust through Diverse Double-Compiling http://www.dwheeler.com/trusting-trust/ Salam-Shalom, Werner