Hi list,

I am currently reading openssl code of version 0.9.8-beta2, and I don't
quite understand the piece of comment above the function
dh_builtin_genparams() in /crypto/dh/dh_gen.c.

In general it says: if $p$ is a safe prime, and $2$ is a generator of
the cyclic group modulo $p$(i.e, $2$ is primitive root of $p), then $p$
is of form $p$ == 11 (mod 24). 

However, my knowledge only leads me to the point that, $p$ = 3/-3 (mod
8), based on the quadratic residue property.

Could anyone please guide me further in the intended direction?

-- 
Thanks & regards
Sun, Xun

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