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Re: Recipient-verifiable messages, was: forwarding an encrypted PGP message is useless

Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de> Sun, 26 May 2002 16:03 UTC

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Date: Sun, 26 May 2002 17:52:36 +0200
From: Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de>
To: ietf-openpgp@imc.org, Hal Finney <hal@finney.org>, adam@cypherspace.org
Subject: Re: Recipient-verifiable messages, was: forwarding an encrypted PGP message is useless
Message-ID: <20020526175235.A535@epsilon>
References: <200204181920.g3IJKei01453@finney.org>
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In-Reply-To: <no.id>; from bmoeller@hrzpub.tu-darmstadt.de on Sun, May 26, 2002 at 03:28:41PM +0000
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On Sun, May 26, 2002 at 03:28:41PM +0000, Bodo Moeller wrote:
> Hal Finney <hal@finney.org>:
>> Adam Back writes:

>>> we proposed:
>>>
>>> 	Encrypt_Bob(K), Encrypt(K, Sign_Alice(Hash(K||Bob_PK)), msg)

>> I see, that seems to work well too.  [...]

> Does it?  If Bob is willing to reveal  K  and additional data such as
> padding used for RSA encryption, can't everyone verify that this is
> indeed a valid signature by Alice on 'msg'?

Oops, I've been parsing the parentheses incorrectly.


-- 
Bodo Möller <moeller@cdc.informatik.tu-darmstadt.de>
PGP http://www.informatik.tu-darmstadt.de/TI/Mitarbeiter/moeller/0x36d2c658.html
* TU Darmstadt, Theoretische Informatik, Alexanderstr. 10, D-64283 Darmstadt
* Tel. +49-6151-16-6628, Fax +49-6151-16-6036

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