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Developer posts secret key on GitHub, loses $40K in 2 minutes
(cointelegraph.com)
This is a most excellent place for technology news and articles.
I see some of that in my job. We put encrypted data in settings files, and the keys for decryption are provided on the VMs where we deploy. The developers never actually see the keys.
I suppose it's as secure as the process for managing the production VMs, assuming the encryption isn't just md5!