Sending a key by creating a token

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Some time ago I had a conversation with supERGeometry about creating and sending a token with an encrypted description and its key. The idea is to create a token that has the title and description encrypted and at the same time send the key so that it can be decrypted (without being visible to everyone of course).

An application to create a token with the encrypted information is finished (many improvements are missing but most of it is done):

Now the way to send the key to the target wallet is missing.

Do you think it is possible to get the key somehow?
Ideas to make the key travel with the encrypted message?

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Would it be possible to require the receiver to sign a separate transaction to decrypt the key?

I mean, if someone else saw the transaction and wanted to decrypt the key, they would be unable without the ability to sign the transaction from the address that matches the receiver’s address…

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Making my way through the forum and some (partial/incomplete) EIPs

This may be interesting: eip-0032

@Ladopixel have you seen this EIP? Or have you considered the problem further?