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Concerns with EC key joint signature and DH usage #73

Closed gselander closed 3 years ago

gselander commented 3 years ago

Provide better justification for the security of the use of the same public key in pairwise and group modes.

https://mailarchive.ietf.org/arch/msg/core/ujj_I-LlqW9fq__quh-YqKS0fF0/

marco-tiloca-sics commented 3 years ago

Addressed in https://github.com/core-wg/oscore-groupcomm/commit/1fe710c720aab07b50af876d17e9fa72a55efc18 and https://github.com/core-wg/oscore-groupcomm/commit/92122dc8952d364f69f99b490f7afd5d1d20753f

marco-tiloca-sics commented 3 years ago

This was addressed in v -12 through the commits above, building on [1] and adapting the derivation of pairwise keys accordingly. Follow-up of issue #72.

[1] https://eprint.iacr.org/2021/509