Security research on access cards

    We all know that access cards are used in many places. So, can anyone use access cards? Are there any restrictions, or how secure is the access card?
    The chip used in access cards is usually the ID chip, which can only store one numberSmart card manufacturingThe earliest type of storage chip in history. This type of memory chip has no encryption function. If you want to forge such an access control card, it's very easy because it contains only one number. The access control system identifies it through the number inside the card. If the card number is in the database, the card is released; otherwise, it cannot be opened. The general idea is this: we just need to take an access card that can open the door to a professional technician for testing. This way, you can find out the card number. By writing IC technology, we write the access control card that can open the door onto another white card that has no data. This way, this white card can also be used to open the door. Therefore, the security performance of the access card is very low, so everyone needs to maintain an objective perspective.