Encryption is less secure than we thought

According to new research from MIT and the National University of Ireland (NUI), the basic information-theory assumption on which the idea of secure information schemes was originally based has come under academic scrutiny. As a result, the scientists claim it's easier to take encrypted files and deduce their original unencrypted contents than one would expect.

In other words, computers can find correlations between encrypted data and its unencrypted form far faster than previously thought, and eventually crack the lot. It actually turned out that a codebreaker needs only one reliable correlation between the encrypted and unencrypted versions of a file in order to begin to deduce further correlations.

An example of researchers' words is 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.

"It's still exponentially hard, but it's exponentially easier than we thought," Ken Duffy, one of the researchers at National University of Ireland said. "Attackers often use graphics processors to distribute the problem. You'd be surprised at how quickly you can guess stuff."

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