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Murray's exception rationale #497

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Oct 3, 2023
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Murray's exception rationale #497

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10 changes: 8 additions & 2 deletions draft-ietf-privacypass-protocol.md
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Expand Up @@ -508,7 +508,10 @@ ensure that the truncated form of new key IDs do not collide with other
truncated key IDs in rotation. Collisions can cause the Issuer to use
the wrong Issuer Private Key for issuance, which will in turn cause the
resulting tokens to be invalid. There is no known security consequence of
using the the wrong Issuer Private Key.
using the the wrong Issuer Private Key. A possible exception to this constraint
would be a colliding key that is still in use but in the process of being
rotated out, in which case the collision cannot reasonably be avoided but it
is expected to be transient.

# Issuance Protocol for Publicly Verifiable Tokens {#public-flow}

Expand Down Expand Up @@ -741,7 +744,10 @@ ensure that the truncated form of new key IDs do not collide with other
truncated key IDs in rotation. Collisions can cause the Issuer to use
the wrong Issuer Private Key for issuance, which will in turn cause the
resulting tokens to be invalid. There is no known security consequence of
using the the wrong Issuer Private Key.
using the the wrong Issuer Private Key. A possible exception to this constraint
would be a colliding key that is still in use but in the process of being
rotated out, in which case the collision cannot reasonably be avoided but it
is expected to be transient.

# Security considerations {#security}

Expand Down