Target: Deceive first, answer questions later

By Evan Schuman, Computerworld |  Security

For Target to get beyond its data breach disaster, it needs to regain the trust of its shoppers. Mystifyingly, it has opted to issue statements that are, at best, misleading. Some tiptoe beyond misleading, since the chain had to know they were untrue when it issued them.

The latest example came Friday, when Target confirmed that encrypted PIN data was stolen. Then came the whopper: "The most important thing for our guests to know is that their debit card accounts have not been compromised due to the encrypted PIN numbers being taken."

Of course those debit card accounts have been compromised. Webster's dictionary defines compromise as exposing something "to risk or danger." When personal identification numbers that give full access to someone's bank account are in the hands of experienced and sophisticated cyberthieves, I think it's safe to say that those bank accounts are indeed exposed to risk or danger. How could anyone argue otherwise?

Target's statement emphasized that the cards were triple DES encrypted and that the encryption key was not stored in Target's systems. It added that the data "can only be decrypted when it is received by our external, independent payment processor."

First off, Target's people know well that any encryption can be broken, if the attacker spends enough time and has enough compute power. It may not be easy, but it can certainly be done. Triple DES is an excellent encryption option, but nothing is unbreakable. Therefore, saying that the data "can only be decrypted" by its payment processor is untrue.

Target should be applauded for not storing that encryption key anywhere on its system. Having it stored solely at its payment processor is also a good move, but processors' systems can be broken into as well. Indeed, given that they have data from a huge number of retailers, it's an especially attractive target.

So, in theory, how could the attacker get access to the PINs? First, a brute-force cracking effort on the encrypted data might work. Second, the key might be grabbed by an attack on the processor's systems, as has happened in the past. Third, there might be a Target insider -- or a processor insider -- who could give up the key for money. Or who might be tricked into giving it up, via social engineering, which cyberthieves love.


Originally published on Computerworld |  Click here to read the original story.
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