[147568] in cryptography@c2.net mail archive
Re: [Cryptography] Elliptic curve question
daemon@ATHENA.MIT.EDU (Hanno =?UTF-8?B?QsO2Y2s=?=)
Tue Oct 8 14:43:48 2013
X-Original-To: cryptography@metzdowd.com
Date: Tue, 8 Oct 2013 19:23:33 +0200
From: Hanno =?UTF-8?B?QsO2Y2s=?= <hanno@hboeck.de>
To: Lay =?UTF-8?B?QW5kcsOhcw==?= <andras@lay.hu>
In-Reply-To: <CAJFxiS8aXAcuR4upk0QxRSO8mUaiW96kDu4Bg8MCz4Gcojppng@mail.gmail.com>
Cc: cryptography@metzdowd.com
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
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On Mon, 7 Oct 2013 10:54:50 +0200
Lay Andr=C3=A1s <andras@lay.hu> wrote:
> I made a simple elliptic curve utility in command line PHP:
>=20
> https://github.com/LaySoft/ecc_phgp
>=20
> I know in the RSA, the sign is inverse operation of encrypt, so two
> different keypairs needs for encrypt and sign. In elliptic curve
> cryptography, the sign is not the inverse operation of encrypt, so my
> application use same keypair for encrypt and sign.
>=20
> Is this correct?
The very general answer: If it's not a big problem, it's always better
to separate encryption and signing keys - because you never know if
there are yet unknown interactions if you use the same key material in
different use cases.
You can even say this more general: It's always better to use one key
for one usage case. It doesn't hurt and it may prevent security issues.
--=20
Hanno B=C3=B6ck
http://hboeck.de/
mail/jabber: hanno@hboeck.de
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