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+**Title:** Fix strict hex parsing </br>
+**Date:** 2021-12-09 </br>
+
+# Summary
+Fix so that sigsum-log-go is strict about lower-case hex parsing.
+
+# Description
+The current sigsum-log-go implementation uses "encoding/hex" which accepts
+upper-case and lower-case hex.  This is a violation of the Sigsum API
+specification and needs to be fixed: upper-case hex must be rejected.