How to distinguish mifare classic 1K clone cards?

[sunhokim]

Can you tell me how to identify mifare classic 1K clone card?

[Fabian_R]

Hello sir,

Thank you for your interest in our products, each card can be verified through an originality signature that can be checked with the following tool.

https://community.nxp.com/t5/NFC-Knowledge-Base/Demo-for-Originality-Signature-Verification/ta-p/127...