In article ,
"tango4" wrote:

After going to all of the time designing the hardware security along came
the idea of public key cryptography so the IGC spec was 'upgraded' to
incorporate this additional security layer. The Cambridges and others got
caught between the two specs.

Public key cryptography was well known in 1994 when the Cambridge 10's
were used at the NZ pre-worlds, and in fact I *told* them at the time
that they should be using something like RSA instead of something
home-grown.

Oh well.

-- Bruce