17 Dec
2003
17 Dec
'03
11:17 p.m.
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