Thank you for your contribution. Since you are not keeping the encrypted message on the blockchain, do you really need Private memo Key? If you are just creating for some sense of authentication then its better to create that directly in your app.
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Someone already asked me this question for the V0.0.1 of this project. In fact, we need to use the private memo key to be absolutely certain that your recipient is who he claims he is.
If we do this with another encryption system, anybody could create an account with the name of a powerful account, and start to scam people. This problem already happened on other mediums like Steem.chat and Discord.
interesting point of view. thx