The exponent of the RSA public key must be odd.??

[Luis Saiz]

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 it´s
> > an implementation/standard option??
>
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