by Ricardo Fernández Serrata
Encryption/Decryption using Rivest Cipher v4 algorithm. SHA-256 is used as Key Derivation Function here.
For higher security, use the output of /dev/random as an OTP and avoid using the KDF so that the key can be indefinitely large (unbounded entropy)
Original (used as base/template): llamalab.com/automate/community/flows/25728
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