Good Encryption Has No Back Door

Daring Fireball on the Department of Justice reopening a spat with Apple over iPhone Encryption:

Saying you want technology companies to make a backdoor that only “good guys” can use is like saying you want guns that only “good guys” can fire. It’s not possible, and no credible cryptographer would say that it is. You might as well say that you want Apple to come up with a way for 1 + 1 to equal 3.

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