Critics Contend U.S. Policy On the Internet Has 2 Big Flaws
Critics charge Clinton Administration's contradictory policies on export of data encryption technology and slow progress on protecting consumer privacy on-line hurt commercial growth of Internet; say stalemate on two key points overshadows otherwise productive year for Administration on information-technology issues; Clinton aide Ira Magaziner cites progress on international accords to keep Internet commerce duty free, other successes, interview; table gives overview and status report on goals listed by Administration last July (M)