Github user zeb209 commented on the pull request:
https://github.com/apache/trafficserver/pull/189#issuecomment-96037112
ATS does not review tickets using the middle key. Here is how it works.
When you rotate the key, you push a new key to the head of the key file and
remove one from the tail of the file. The new key will be used to encrypt
session tickets and the rest are only used to decrypt session tickets. The
middle keys are not used to encrypt any more because they are retired and only
used to resume sessions.
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