The access control system that the card is enrolled in knows the sequence of. Unique keys the card uses to encrypt the Official Welcome To The Dorture Chamber Shirt. But someone who randomly ties to read the card. And use that encrypted credential will fail . Because the encrypted credential is only valid for a short window of time. Even if they managed to read the card several times, the set of encrypted credentials that. They get won’t give them enough information to figure. Out what the unique sequence of keys is. The first type of contactless cards were “prox” cards. These cards were all encoded with a unique number. Each manufacturer of prox cards was given a unique number, and every card they.
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This was still insecure, because if you new the manufacturer of the card. A facility used, and access to at Official Welcome To The Dorture Chamber Shirt. AN idea of a range of numbers that cards issued by the facility would fall into. Also, to your point, if you got close enough to someone you knew was carrying a card, you could “read” the card number and clone the card. After that you have iClass cards from HiD. These cards were more secure, because the number on the card was. Encrypted using key cryptography. The company that made the cards had the private key and used it to encrypt the number before encoding it on the card. Then, the card reader uses the public key to decrypt the number the card “presented” to the reader.
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