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It's very similar to this question: How to decrypt an encrypted message using metamask? who was put one year ago.
As user, I would like to store data safely on the blockchain, data that I want to retrieve easily and decode locally. It seems that such feature was planned on web3.js 1.0 but I did not see anything on it.....
There is no such functionality in web3js (yet), but this answer ( Encrypt data using public key ) may help if you are looking for some way to do it, apart from web3js
