Gentoo Archives: gentoo-dev

From: Kristian Fiskerstrand <k_f@g.o>
To: gentoo-dev@l.g.o
Subject: Re: [gentoo-dev] [PATCH] document openssh-7.0 dsa key change #557388
Date: Thu, 13 Aug 2015 07:02:51
Message-Id: 55CC40A5.3070504@gentoo.org
In Reply to: [gentoo-dev] [PATCH] document openssh-7.0 dsa key change #557388 by Mike Frysinger
1 -----BEGIN PGP SIGNED MESSAGE-----
2 Hash: SHA512
3
4 Hi,
5
6 might be nitpick, but..
7
8 On 08/13/2015 05:17 AM, Mike Frysinger wrote:
9
10 > +Your best option is to generate new keys using newer types such as
11 > rsa +or ecdsa or ed25519. RSA keys will give you the greatest
12 > portability +with other clients/servers while ed25519 will get you
13 > the best security +with OpenSSH (but requires recent versions of
14 > client & server).
15
16 Strictly speaking DSA/DSS is newer than RSA (FIPS-186-1 came in early
17 90's, RSA around since 70s, although the ElGamal signature scheme was
18 around before that). ECC gives a better performance on the same
19 security level when comparing to DSA/RSA, however claiming better
20 security in general isn't necessarily valid, Ed25519 is a signature
21 scheme over Curve25519 which is a 256 bit curve generally considered
22 to be 128 bit security level, roughly comparable to a 3072 bit RSA key.
23
24 (as a side note, it seems OpenSSH was not updated for FIPS-186-3 that
25 adds other key lengths to DSA, but refers to DSA to mean FIPS-186-2)
26
27
28
29
30 - --
31 Kristian Fiskerstrand
32 Public PGP key 0xE3EDFAE3 at hkp://pool.sks-keyservers.net
33 fpr:94CB AFDD 3034 5109 5618 35AA 0B7F 8B60 E3ED FAE3
34 -----BEGIN PGP SIGNATURE-----
35
36 iQEcBAEBCgAGBQJVzEChAAoJECULev7WN52F9RgH/2ogCdlZv+RoY7fwaTrviyFK
37 oAzDRubkCPuIFAuERgqpkPlnu692tnNXXtJ6w4krSpg4lFSeh7KPPYM/C9dA++V4
38 7/oyCuOiQ6pxcQlHa1dTpCQjdWAOE5SL0os4Fy81hVGAvZgPGubRQSelBe9UUE4U
39 tP7Z+5FW/bnX91K0OZEl75qoKvLT4xqhWNUiLG3V1aUCN+DC7ZaSJkoC27vd+l+b
40 iqetcOzudojT4DyltO+dIkzQeSlaMF6qZnmq+MJU5m9b8U9ACw30YalD8awumN21
41 6cK0nOOxQI4M0VRLjl+9xMLrYnuQbeJnN3JBZpKnTcZ5S3hs0DPfhvTcAv0pyaw=
42 =LHJd
43 -----END PGP SIGNATURE-----

Replies