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Date: Mon, 30 Jan 2023 13:58:34 -0600
From: Mark Hack <markhack@...khack.com>
To: oss-security@...ts.openwall.com, Solar Designer <solar@...nwall.com>
Subject: Re: Data operand dependent timing on Intel and Arm
CPUs
The blinding I have seen was for RSA
https://www.openssl.org/docs/man1.1.1/man3/RSA_blinding_on.html and at
least for ECDSA signatures
For symmetric keys such as AES which are mostly table lookup and XOR
based, I have not seen any blinding.
Regards
Mark Hack
On Mon, 2023-01-30 at 14:13 -0500, Demi Marie Obenour wrote:
> On Mon, Jan 30, 2023 at 10:43:16AM -0600, Mark Hack wrote:
> > This is a concern, but if you look into the crypto implementations,
> > data blinding is applied to mitigate both instruction and power
> > side
> > channel attacks
>
> Can you provide examples? I have never seen blinding used for
> symmetric
> cryptography outside of embedded systems.
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