Regarding keeping emails private and using client-side encryption, this one makes an interesting read:
Encryption is less secure than we thought (MIT News)
Quote:
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“It’s still exponentially hard, but it’s exponentially easier than we thought,” Duffy says. One implication is that an attacker who simply relied on the frequencies with which letters occur in English words could probably guess a user-selected password much more quickly than was previously thought. “Attackers often use graphics processors to distribute the problem,” Duffy says. “You’d be surprised at how quickly you can guess stuff.”
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