store the byte [] in the preferences?

I have several pieces of data that I have successfully store Prefs (PersistentObject and Hashtable). Currently, I am only store strings and integers (which I converted to strings). I want to start storing the encrypted data (byte []) in the preferences. What is the best way to implement? I paint a white on research and I want to ensure my implementation is not that work today, but it fails two months later.

Thanks in advance!

Byte array is persistent, as is.  Can you not just add it as an entry in your hash table?

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