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Yes and no. When you visit your bank's online accounting system you enter a securely encrypted channel which works very similar to SSH. However, since you're arbitrarily opening connections from your palm to various servers, building an encryption per communication would be silly (and most servers do not support it anyway). It would make more sense to encrypt -everything- you send or receive. But that means you are either dependent on your wifi access point (which could have security) or ... I wouldn't know what else. You could perhaps make a secure connection through SSH to a proxy server and internet through that. Yes, yes. That would work.
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