Edit: The plugin keeps improving, so I raised the rating.
Aside from the fact that the "security"-measurements that this plugin tries to implement are a joke (there have been enough cases where plugins in the official repo have been compromised), the "calculation" itself is bogus.
From reviewing the source code (spaghetti/function code) there are issues all over:
Summed up: Don't use it. This is the opposite of security.
Reviewed Version: 0.71.2
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