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Re: Password Difficulties

To: [email protected]
Subject: Re: Password Difficulties
From: [email protected] (Bruce Schneier)
Date: Sat, 2 Jul 1994 16:41:28 -0500 (CDT)
In-Reply-To: <[email protected]> from "Jim Gillogly" at Jul 2, 94 10:00:58 am
Sender: [email protected]

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.

I generally assume that I need about one word per byte of key.  Thus, if
I want to generate a 64-bit key, I need an eight-word phrase.

Bruce

References:
- Re: Password Difficulties
  - From: Jim Gillogly <[email protected]>

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