this post was submitted on 15 Dec 2023
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netsec

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In a first, cryptographic keys protecting SSH connections stolen in new attack (arstechnica.com)
submitted 11 months ago by AtmaJnana to c/netsec
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Link to the paper: https://eprint.iacr.org/2023/1711.pdf

The vulnerability occurs when there are errors during the signature generation that takes place when a client and server are establishing a connection. It affects only keys using the RSA cryptographic algorithm, which the researchers found in roughly a third of the SSH signatures they examined. That translates to roughly 1 billion signatures out of the 3.2 billion signatures examined. Of the roughly 1 billion RSA signatures, about one in a million exposed the private key of the host.

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[–] [email protected] 4 points 11 months ago

At least it only affects RSA keys.

I've been working on changing all of mine to ED25519. I guess I should get the rest of them changed out now.