From: Luis Saiz <LSaiz@atos-ods.com>

To: Sunder <cryptography@c2.net>

Message Hash: b8e6121d2b89fb50387866e52e9c35ec9100181e8a418f7a0f9e2398e7d3f57f

Message ID: <356D88D7.1D480241@atos-ods.com>

Reply To: <356D1CA8.C39ABB94@atos-ods.com>

UTC Datetime: 1998-05-28 15:55:03 UTC

Raw Date: Thu, 28 May 1998 08:55:03 -0700 (PDT)

```
From: Luis Saiz <LSaiz@atos-ods.com>
Date: Thu, 28 May 1998 08:55:03 -0700 (PDT)
To: Sunder <cryptography@c2.net>
Subject: Re: The exponent of the RSA public key must be odd.??
In-Reply-To: <356D1CA8.C39ABB94@atos-ods.com>
Message-ID: <356D88D7.1D480241@atos-ods.com>
MIME-Version: 1.0
Content-Type: text/plain
Sunder wrote:
> How many prime numbers do you know of that are even?
>
One: 2 ;-)
OK, I've never realized that e and d must both be co-prime with respect to (p-1)(q-1), only
that ed=1 mod((p-1)(q-1)), and I didn't saw the implication.
Sorry for this stupid question, next time I'll do more mathematics before.
> Luis Saiz wrote:
> >
> > OS/390 Integrated Cryptographic Service Facility Application
> > Programmer's Guide Version 2 Release 5 Publication No. SC23-3976-02 :
> > http://ppdbooks.pok.ibm.com:80/cgi-bin/bookmgr/bookmgr.cmd/DOCNUM/SC23-3976/CCONTENTS
> >
> > In several parts of the document it's specified that, as a restriction:
> >
> > > The exponent of the RSA public key must be odd.
> > >
> > It's there any (unknown to me) security reason to be this way, or its
> > an implementation/standard option??
>
> --
>
> =====================================Kaos=Keraunos=Kybernetos==============
> .+.^.+.| Ray Arachelian |Prying open my 3rd eye. So good to see |./|\.
> ..\|/..|sunder@sundernet.com|you once again. I thought you were |/\|/\
> <--*-->| ------------------ |hiding, and you thought that I had run |\/|\/
> ../|\..| "A toast to Odin, |away chasing the tail of dogma. I opened|.\|/.
> .+.v.+.|God of screwdrivers"|my eye and there we were.... |.....
> ======================= http://www.sundernet.com ==========================
```

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- 1998-05-28 (Thu, 28 May 1998 01:21:02 -0700 (PDT)) - The exponent of the RSA public key must be odd.?? -
*Luis Saiz <LSaiz@atos-ods.com>*- 1998-05-28 (Thu, 28 May 1998 07:41:57 -0700 (PDT)) - Re: The exponent of the RSA public key must be odd.?? -
*Sunder <sunder@brainlink.com>* - 1998-05-28 (Thu, 28 May 1998 08:55:03 -0700 (PDT)) - Re: The exponent of the RSA public key must be odd.?? -
*Luis Saiz <LSaiz@atos-ods.com>*- 1998-05-28 (Thu, 28 May 1998 12:40:04 -0700 (PDT)) - Re: The exponent of the RSA public key must be odd.?? -
*Xcott Craver <caj@math.niu.edu>*

- 1998-05-28 (Thu, 28 May 1998 12:40:04 -0700 (PDT)) - Re: The exponent of the RSA public key must be odd.?? -

- 1998-05-28 (Thu, 28 May 1998 07:41:57 -0700 (PDT)) - Re: The exponent of the RSA public key must be odd.?? -