| A. M. Odlyzko, June 1991. Private conversation. |
.... s algorithm[13] and that ff is a primitive root of GF (fi) The latter two conditions are related; we must know the factorization of fi Gamma 1 in order to validate ff. Requiring that fi be of the form kp 1, where p is prime and k a very small integer, solves both problems. Recent results[14] do suggest that it may be possible to choose a fi that contains a hidden trap door. At the moment, this attack does not seem to be practical. If that should change, other choices would, of course, be preferable. Thus far, we have said nothing about choosing ff. But if a suitable value of fi is ....
A. M. Odlyzko, June 1991. Private conversation.
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