Article:
  The SSH Cryptosystem
Subject:   Pass phrase prompt at each login
Date:   2002-11-18 20:40:17
From:   rktrujillo
Response to: Pass phrase prompt at each login

It isn't specified in the article.
When generating the key just hit enter when it asks for a paraphrase. Then after you copy the key over you can ssh in without a password or paraphrase.