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https://issues.apache.org/jira/browse/SSHD-1107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17243271#comment-17243271
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Lyor Goldstein commented on SSHD-1107:
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If something is (a) definitely worth doing and (b) relatively uncomplicated why
wait ?
> Diffie Hellmann group exchange minimum key size should be configurable for
> security reasons
> -------------------------------------------------------------------------------------------
>
> Key: SSHD-1107
> URL: https://issues.apache.org/jira/browse/SSHD-1107
> Project: MINA SSHD
> Issue Type: Improvement
> Affects Versions: 2.5.1
> Reporter: Achim Hügen
> Assignee: Lyor Goldstein
> Priority: Major
> Fix For: 2.6.0
>
>
> Currently the minimum key size for DH group exchange is 1024 bit (for example
> when using diffie-hellman-group-exchange-sha256 for KEX)
> This is below the current recommendations of 2048 bit (see
> [NIST|https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57Pt3r1.pdf],
> Table 2-1 and
> [https://tools.ietf.org/id/draft-ietf-curdle-ssh-kex-sha2-09.html#rfc.section.3.4).]
> For compatibility reasons it is still essential to support
> diffie-hellman-group-exchange-sha256, but the minimum key size should be
> configurable, so that a server operator can harden its server.
> The minimum size is hardcoded in
> org.apache.sshd.common.util.security.SecurityUtils#MIN_DHGEX_KEY_SIZE
> This could be made configurable via a system property like one already exists
> for the maximum (see MAX_DHGEX_KEY_SIZE_PROP)
>
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