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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=========================================
+Spec Lite: Deprecate Checksum Computation
+=========================================
+
+..
+  Mandatory sections
+
+:project: glance
+
+:problem: The glance 'checksum' image property contains an MD5 hash of image
+          data.  MD5 has not been considered secure for some time, and in
+          order to comply with various security standards, an implementation
+          of the MD5 algorithm may not be available on glance nodes.
+
+:solution: Announce that Glance will no longer populate the 'checksum' on new
+           images beginning with the Victoria release.  Instead, operators
+           should rely on the secure "multihash" feature that was introduced
+           in Rocky.  The 'checksum' property will remain on legacy images.
+
+:impacts: None.
+
+..
+  Optional sections -- delete any that don't apply to this spec lite
+
+:how: In Ussuri: release note.  In Victoria: Remove the code that uses MD5.
+      (This will affect primarily the glance_store drivers.)
+
+:alternatives: We could check to see if the algorithm is available, and if it
+               is, compute the MD5.  But this seems pointless as the secure
+               multihash is already being computed for all new images.
+
+               We could remove the 'checksum' entirely, but this would require
+               a migration to the multihash.  For at least some backends, this
+               would mean downloading the image data for each legacy image to
+               do the computation, which could take a very long time.
+
+:timeline: Deprecation and release note in Ussuri; removal in Victoria.