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The Authorization Request Cryptogram (ARQC) is an 8-byte cryptographic value generated by the EMV chip card (Integrated Circuit Card or ICC) during a transaction to request online authorization from the card issuer. It acts as a Message Authentication Code (MAC) that verifies the authenticity of...

EMV (Europay, Mastercard, and Visa) cryptograms are cryptographic codes generated during payment transactions to ensure security, authenticity, and integrity. They are a core component of the EMV standard, which governs chip-based payments to prevent fraud like cloning or replay attacks. In the...

EMV (Europay, Mastercard, and Visa) and contactless NFC (Near Field Communication) are related but distinct technologies in the payments ecosystem. EMV is a global standard for secure chip-based payment cards and transactions, focusing on authentication and fraud prevention through dynamic data...

AAC (Application Authentication Cryptogram) and ARQC (Authorization Request Cryptogram) are both types of Application Cryptograms (ACs) in EMV systems, serving as Message Authentication Codes (MACs) to ensure transaction integrity and authenticity. They are generated by the chip card using...

Overview of AAC Generation Process The Application Authentication Cryptogram (AAC) is an 8-byte cryptographic value generated by an EMV chip card to indicate that a transaction has been declined, either offline or after an online authorization attempt. It serves as a Message Authentication Code...

Overview of TC Generation Process The Transaction Certificate (TC) is an 8-byte cryptographic value generated by an EMV chip card to confirm approval of a transaction, either offline or after successful online authorization. It acts as a Message Authentication Code (MAC) that provides proof of...

Overview of ARPC Verification Process In EMV (Europay, Mastercard, and Visa) transactions, the Authorization Response Cryptogram (ARPC) is an 8-byte cryptographic value generated by the card issuer in response to a valid Authorization Request Cryptogram (ARQC) from the chip card. The ARPC serves...

Overview of ARQC Generation The Authorization Request Cryptogram (ARQC) is an 8-byte cryptographic value generated by an EMV chip card during an online transaction to request authorization from the issuer. It serves as a Message Authentication Code (MAC) that authenticates the card and...

Overview of Key Derivation in EMV Key derivation in EMV (Europay, Mastercard, and Visa) systems is a cryptographic process used to generate unique session keys for secure transactions, ensuring that each transaction uses fresh keys to prevent replay attacks and enhance security. This is...

Overview of Mobile Wallet Offline Payments Mobile wallets, such as Apple Pay, Google Pay, and Samsung Pay, enable users to make payments without an active internet connection in many scenarios, particularly for contactless (NFC-based) transactions at point-of-sale terminals. This is achieved...

Overview of NFC Relay Attacks on Access Cards NFC relay attacks on access cards involve intercepting and relaying wireless signals between an NFC-enabled access card (or smartphone acting as one) and a reader, such as those used for door entry in offices, buildings, events, public...

Overview of EMV Contactless Relay Attacks EMV contactless relay attacks, also known as NFC relay attacks or "ghost tap" fraud, are a form of man-in-the-middle (MitM) exploitation targeting contactless payment systems compliant with EMV standards. These attacks exploit the short-range nature of...

Overview of EMV Contactless Offline EMV Contactless Offline refers to the capability within the EMV (Europay, Mastercard, and Visa) standard for performing contactless transactions without real-time online authorization from the card issuer. This mode leverages NFC (Near Field Communication)...

Overview of EMV Offline Authorization EMV offline authorization refers to the process in chip-based payment transactions where the card and terminal (e.g., point-of-sale device) approve or decline a transaction without real-time communication to the card issuer. This is governed by predefined...

Overview of American Express SafeKey American Express SafeKey is a security protocol designed to enhance online and in-app card transactions by adding an extra layer of authentication to detect and reduce fraud. It leverages the global industry standard EMV 3-D Secure (3DS), which involves...

EMV Contactless Optimization Overview EMV contactless optimization refers to strategies and technologies aimed at improving the performance, security, and user experience of contactless payments using NFC-enabled cards or devices, as defined by EMVCo standards like the EMV Contactless Chip and...

Overview of MSD Contactless Mode MSD Contactless Mode, where MSD stands for Magnetic Stripe Data, is a legacy operating mode for contactless payments that emulates traditional magnetic stripe transactions over NFC interfaces. It was introduced as an early form of contactless technology in...

Overview of Distance Bounding Protocols Distance bounding protocols (DBPs) are cryptographic protocols designed to enable a verifier (V) to establish an upper bound on the physical distance to a prover (P). They achieve this by measuring the round-trip time (RTT) of signals, typically...

Overview of NFC Skimming Attacks NFC (Near Field Communication) skimming attacks refer to unauthorized attempts to read or intercept data from contactless devices, such as payment cards, smartphones, or passports, using NFC technology. Operating under standards like ISO/IEC 14443, NFC enables...

What Are EMV Relay Attacks? EMV relay attacks, also known as NFC relay attacks or Mafia fraud, are a type of man-in-the-middle (MitM) exploit targeting contactless payment systems based on the EMV (Europay, Mastercard, and Visa) standard. These attacks exploit the assumption of physical...