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    Author Topic: [ANNOUNCE] Bitmessage - P2P Messaging system based partially on Bitcoin  (Read 89915 times)
    phelix
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    March 14, 2013, 06:05:35 PM
     #141

    I doubt that because I can use your public key from the blockchain to encrypt messages against your will.

    But then you can see whether or not I could successfully decrypt it and in some cases you can also see the plaintext (like if Bitmessage is being used on a server for some sort of communication). This additional information could be utilized. Cryptographers will tell you that it is bad practice to use the same key for encryption and signing. And if there are people on the forum telling everyone else that it is unsafe to share keys between Bitcoin and Bitmessage then no one is going to do it (not that I would want them to).
    I agree things are simpler and cleaner, thus potentially safer with separate keys. But it might be highly beneficial to be able to send encrypted messages directly to a BTC address, so this concept deserves some thought.


    [...]
    Actually I suppose that a bitcoin private key could be used to sign a message saying that they assert that new_pub_key_1 is to be used for signing and new_pub_key_2 is to be used for encryption. That would work. Then users could use their Bitcoin addresses in Bitmessage. This would require that users import their wallet keys into Bitmessage (or vise-versa).
    [...]
    Sounds like a plan  Grin
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