The Spool-Partition value for a principal: an HMAC-SHA-256 under the server secret, so the browser can tell partitions apart without learning the principal, and one principal's id cannot be computed from another's.
Spool-Partition
The
Spool-Partitionvalue for a principal: an HMAC-SHA-256 under the server secret, so the browser can tell partitions apart without learning the principal, and one principal's id cannot be computed from another's.