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I would like to create a dapp where by users can call a function on a smart contract, proving that they know a secret phrase.

I am thinking that I would use web3.js to create an public / private key pair, using a predetermined phrase (e.g. "iamasecret").

The contract would already have the public key encoded. The user would sign a transaction using the private key generated from the secret, and invoke a smart contract function, which would then verify the signature.

Is this possible using web3.js?

Does anyone know how to do it?

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