If hackers can open up the card and get to the key, they can extract the key and use it to make cloned cards. ![]() Just like hiding it inside a (very thin) brick.ĭES is a symmetric-key algorithm, which means you use the same key to encrypt and decrypt. Of course, Pay-TV subscribers would have to remember the key, and have to enter it into their decoder - very inconvenient, but very safe. If your lock (algorithm) is faulty, youll find out quickly enough and replace the lock. Thats a bit like hiding your door key inside a brick or under a flower pot once the secret (that the key is in the brick) is discovered, you have no security.Įverybody knows how your door security works (you put the right key in the lock and turn), but that only works if you have the key. Other information is also stored on the chip subscriber ID, subscription details, billing details, censorship filters and so on.Įach chip will have its own non-volatile memory (requires no battery), computer programs and a small central processing unit (CPU).Īn algorithm is a recipe for doing something in this case, for scrambling and descrambling the digital signal. When the card is inserted, the chip is plugged into the decoder, allowing the CAM to get the decryption key. ![]() Some decoders have the smartcard built-in already, so there is no external slot.
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