[Cryptography] Email and IM are ideal candidates for mix networks

[Christian Huitema]

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> Suppose, as in Bitcoin, my email address *is* my public key

You can even use some hash compression tricks so you only need 9 or 10 characters to express the address as hash of the public key. 

That works very well, until you have to change the public key.

- -- Christian Huitema
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