What is the best way to encrypt and decrypt a variable in Solidity so only the msg.sender and contract can see that variable?
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Practical answer: You can't. If the contract can see it when it executes, everyone who has the blockchain can see it.
Theoretical answer that won't help you: Homomorphic encryption. See Can smart contracts compute on encrypted data?
answered Oct 31, 2016 at 22:03
