Open Stack

This can be done as a backend or as a proxy fairly easily. Move this
from keystone bug tracker as it is generally a good feature request.

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https://bugs.launchpad.net/bugs/1578466

Title:
  cache should offer encryption in a similar manner to
  keystonemiddleware cache does

Status in OpenStack Identity (keystone):
  Won't Fix
Status in oslo.cache:
  New

Bug description:
  Keystone middleware's caching of tokens offers HMAC validation and
  encryption of the tokens in the cache. This is important because
  memcache has literally zero authentication or protection from any user
  on the system.  So this feature should be ported in from keystone
  middleware into keystone.

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