This is a good point. I didn't delve into the specifics of
implementation due to the larger issues that I raised. Libbitcoin Server
uses CurveZMQ, an implementation of CurveCP.

http://curvecp.org
http://curvezmq.org
https://en.bitcoin.it/wiki/Libbitcoin_Server

e

On 07/22/2015 04:11 PM, gb via bitcoin-dev wrote:
> Why RSA?
> 
>>
>> Here is an idea, inspired by TOR, on which I would like to have some
>> feedback: We create an anonymous routing layer between Electrum servers
>> and clients.
>>
>> * Each server S publishes a RSA public key, KS
>> * Each client receives a list of available servers and their pubkeys
>> * For each wallet address, addr_i, a client chooses a server S_i, and a
>> RSA keypair (K_addr_i, k_addr_i)
>> * The client creates a list of encrypted requests. Each request contains
>> addr_i and K_addr_i, and is encrypted with the pubkey KS_i of S_i
>> * The client chooses a main server M, and sends the list of encrypted
>> requests to M
>> * M dispatches the client's requests to the corresponding servers S_i
>> (without the client's IP address.)
>> * Each server decrypts the requests it receives, performs the request,
>> and encrypts the result with K_addr_i
>> * M receives encrypted responses, and forwards them to the client.
>> * The client decrypts the encrypted response with k_addr_i