Tom:
Users of X9.17 contact a Center for Key Distribution (CKD) or a Center for Key
Translation (CKT) for cryptographic keys, and they have chosen to distribute
keys and IVs in the same manner. You described part of the justification for
this in your previous message -- very structured messages. There is some
concern about the quality of random numbers that might be used as IVs. Since
the CKD or CKT is given a source of good random numbers for keys, they are
simply taking advantage of that same good random number source for IVs.
Russ