A smartphone bitcoin client with options for encrypted messaging would make for a great alternative text/sms system compared to the high fees charged by most wireless carriers for text messaging. Now, of course, I know of free text messaging apps, but they tend to contain ads. But with bitcoin, the small transaction fees for passing the message along would work as a great incentive instead…
Theymos already said this… ECDSA does not support encrypting messages. Only digital signatures.
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