OTP (One-Time Pad Generator Program) and MD5 signature

From: Alex Vinokur (alexvn_at_x-privat.org)
Date: 04/17/05 

Date: Sun, 17 Apr 2005 07:01:59 +0300

OTP at http://www.fourmilab.ch/onetim­e/otpgen.html
enables the user to generate one-time pads or password lists in a variety of formats.

The question is about MD5 signature of the generated keys.

For instance, a sender has generated keys and their MD5 signatures, encrypted (with using one of the generated keys) some message
and sent the encrypted message, the keys and MD5 signatures to a recipient.
To decrypt the encrypted message the recipient needs the key itself, not its MD5 signature.
How is MD5 signature used in this data transmission process?
Who and how does verify keys with using MD5 signatures? Sender? Not recipients? 

-- 
 Alex Vinokur
     email: alex DOT vinokur AT gmail DOT com
     http://mathforum.org/library/v­iew/10978.html
     http://sourceforge.net/users/a­lexvn

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