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ietf-wg-ppm / draft-ietf-ppm-dap

This document describes the Distributed Aggregation Protocol (DAP) being developed by the PPM working group at IETF.
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Clarify purpose of report ID uniqueness #559

Closed tgeoghegan closed 1 month ago

tgeoghegan commented 1 month ago

Discuss explicitly the attack prevented by enforcing unique report IDs, which is to stop honest Client reports from being replayed. This would also be necessary to satisfy VDAF's requirement of nonce uniqueness, but it's not yet clear VDAF will impose that exact requirement (see 1).

There's no functional change here, but hopefully being explicit can short-circuit future discussion of why we have this expensive requirement.

See #558 for motivating discussion.

tgeoghegan commented 1 month ago

This should merge cleanly before or after #554, despite touching nearby text.