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Announce: OpenSSH 8.4 released

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It is now possible[1] to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. For this reason, we will be disabling the "ssh-rsa" public key signature algorithm by default in a near-future release.

This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs.

The better alternatives include: [...]

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OpenSSH 8.4 Brings Better Support For FIDO/2FA Keys

  • OpenSSH 8.4 Brings Better Support For FIDO/2FA Keys

    Version 8.4 of OpenSSH has been released and among its wide assortment of changes is a lot of continued work on FIDO/2FA key handling.

    For those with a FIDO key like the YubiKey or Google Titan Security Key for handling two-factor authentication, OpenSSH 8.4 has better support in place. OpenSSH 8.4 now supports FIDO keys that require a PIN code to be entered for each use, SSHD now supports a "verify-required" option to require FIDO signatures assert the token be verified, SSH-Keygen now supports the FIDO 2.1 credProtect extension, support for verifying FIDO WebAuthn signatures, better support for multiple attached FIDO tokens, and many other fixes.

LWN on OpenSSH 8.4

  • OpenSSH 8.4 released

    OpenSSH 8.4 is out. The SHA-1 algorithm is deprecated and the "ssh-rsa" public key signature algorithm will be disabled by default "in a near-future release." They note that it is possible to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K.

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