1994-07-03 - Re: Password Difficulties

Header Data

From: smb@research.att.com
To: schneier@chinet.chinet.com (Bruce Schneier)
Message Hash: 20e3c6e8839ba0f755c38eaaeae110dac41d9aa0048761d0b7e1879175808272
Message ID: <9407030005.AA11165@toad.com>
Reply To: N/A
UTC Datetime: 1994-07-03 00:06:05 UTC
Raw Date: Sat, 2 Jul 94 17:06:05 PDT

Raw message

From: smb@research.att.com
Date: Sat, 2 Jul 94 17:06:05 PDT
To: schneier@chinet.chinet.com (Bruce Schneier)
Subject: Re: Password Difficulties
Message-ID: <9407030005.AA11165@toad.com>
MIME-Version: 1.0
Content-Type: text/plain

	 Figure that each English character has 1.8 bits of entropy.
	 (This is a conservative number, because it doesn't take into
	 account case, spacing, or punctuation.)  If I want a
	 passphrase that will map into a 64-bit keyspace, I need at
	 least a 35-chararcter phrase.

Don't forget the difficulty of typing such a long phrase, with
echoing turned off.