Can I clone my campus card onto an nfc sticker?

If your campus card is a Mifare DESfire EV2 then the short answer is probably not.

DESfire is a fairly secure and well trusted product line within the Mifare family from NXP.
Your card could be from one of the lucky and badly implemented systems that only used UID for access control. In that case, you just need to clone the UID from your original to a magic DESfire or, possibly, Mifare Classic.

If you have an Android phone, download NXP TagInfo and scan the campus card. If it has several applications contained in it, then its most likely cannot be cloned.

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