Re: [TLS] Using RSA PSS in TLS
Johannes Merkle <johannes.merkle@secunet.com> Mon, 14 October 2013 12:36 UTC
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Date: Mon, 14 Oct 2013 14:36:03 +0200
From: Johannes Merkle <johannes.merkle@secunet.com>
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Subject: Re: [TLS] Using RSA PSS in TLS
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> RSA-PSS would apply only to the DHE_RSA variants, for the vanilla > RSA ciphersuites, one would need RSA-OAEP instead, and it seems > that using a traditional RSA key/cert for both, signature and > encryption is somewhat incompatible with RSA-PSS/RSA-OAEP -- when > signaling is through the AlgorithmIdentifier in SPKI of the > entity certificate. As I wrote to Santosh, the PSS AlgorithmIdentifier in SPKI is only optional and hardly supported. TLS-Servers should get a certificate with the usual rsaPublicKey AlgorithmIdentifier in SPKI, which can be used for any RSA operation, including PSS, OAEP and even signature and encryption according to PKCS#1v1.5. > > Having to support two seperate server certificate (different by algorithm) > would have a huge impact on > - TLS implementations > - administrative UIs > - server administration procedures > - CA procedures > > What exactly is the real and serious problem that such a HUGE change > would be trying to fix? > No huge change implied by the change. I admit there is no big issue with old RSA, it it just anticipation of potential future attacks by using a provably secure algorithm. -- Johannes
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Peter Gutmann
- Re: [TLS] Using RSA PSS in TLS Santosh Chokhani
- [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Hanno Böck
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Peter Gutmann
- Re: [TLS] Using RSA PSS in TLS Santosh Chokhani
- Re: [TLS] Using RSA PSS in TLS Santosh Chokhani
- Re: [TLS] Using RSA PSS in TLS Rob Stradling
- Re: [TLS] Using RSA PSS in TLS Martin Rex
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Florian Weimer
- Re: [TLS] Using RSA PSS in TLS CodesInChaos
- Re: [TLS] Using RSA PSS in TLS Fedor Brunner
- Re: [TLS] Using RSA PSS in TLS Hanno Böck
- Re: [TLS] Using RSA PSS in TLS Hanno Böck
- Re: [TLS] Using RSA PSS in TLS Martin Rex
- Re: [TLS] Using RSA PSS in TLS Geoffrey Keating
- Re: [TLS] Using RSA PSS in TLS Watson Ladd
- Re: [TLS] Using RSA PSS in TLS Johannes Merkle
- Re: [TLS] Using RSA PSS in TLS Manuel Pégourié-Gonnard
- Re: [TLS] Using RSA PSS in TLS Peter Gutmann
- Re: [TLS] Using RSA PSS in TLS Peter Gutmann
- Re: [TLS] Using RSA PSS in TLS Martin Rex
- Re: [TLS] Using RSA PSS in TLS Peter Gutmann