Re: one time pads
From: Bill Unruh (unruh_at_string.physics.ubc.ca)
Date: 08/31/03
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Date: Sun, 31 Aug 2003 06:43:56 +0000 (UTC)
jim evans <jimsnews@houston.rr.com> writes:
]On 27 Aug 2003 01:55:34 GMT, pcportinc@aol.combatSPAM (PCportinc)
]wrote:
]>I watched that PBS special on the Atom Bomb spies.
]I just watched that program.
]One thing they didn't explain and I wondered about . . .
]How does the recipient know where in the one-time-pad to start?
You start the message with "I am using page 47".
Then you destroy page 47
The british printed them on silk and the agent cut away the line used
and burned it. (I am using silk 5 line 43)
]For the sake of argument assume it is really a pad with pages of
]numbers as shown on the program. How does the recipient know which
]page to use.
]Another question.
]If more that two people are use he same pads, how does the sender know
]a page has already been used and so not to use it again?
oThey do not. A one time pad is used only once and by only one person.
Two people never use the same pad. Each agent is given his/her own .
The out and in pads are kept separate. (eg top half is out, bottom half
in).
]jim
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