BBS generator

[paul at fatmans.demon.co.uk]

Does anyone here know the approximate ammount of output from a BBS 
PRNG needed to predict with some certainty the next bit or bits? - is 
the generator totally secure, ie. do you need to factor to predict or 
is there an attack using the output?


  Datacomms Technologies web authoring and data security
       Paul Bradley, Paul at fatmans.demon.co.uk
  Paul at crypto.uk.eu.org, Paul at cryptography.uk.eu.org    
       Http://www.cryptography.home.ml.org/
      Email for PGP public key, ID: 5BBFAEB1
     "Don`t forget to mount a scratch monkey"