You cannot use a single master key for every card. You must derive a for each card using:
To build a functional and secure ARQC generation or validation feature, you must implement the four-step cryptographic process defined by . 1. Key Diversification arqc_gen.rar
⚠️ Files with this name found on public forums or file-sharing sites are frequently flagged by security researchers as malware or phishing tools. They often contain "Remote Access Trojans" (RATs) or exploits targeting vulnerabilities in older versions of WinRAR. You cannot use a single master key for every card