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RE: IPSec for IP Telephony
We have had a number of other, optional, algorithms defined for IPsec. A
stream cipher would be fine, so long as it carries an IV to deal with
dropped or re-ordered packets. Also, note that ESP usually employs
authentication, in the form of HMAC, which would introduce latency as well.
if one omits authentication, and uses a stream cipher of the sort you
describe, than an attacker could modify packets with complete control,
which might be a concern.