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| === Definition and Role: ===
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/faq/emv/whats-capk}} |
| * CAPK, or Certification Authority Public Key, is a key used in EMV (Europay, MasterCard, and Visa) card systems for Offline Data Authentication (ODA).
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| * It plays a crucial role in the authentication of EMV card transactions, regardless of whether the transaction is processed online or offline.
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| === Operational Importance: ===
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| * '''Offline Data Authentication:''' CAPK is essential for validating the authenticity of card data during offline transactions.
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| * '''Transaction Processing:''' For both online and offline transactions, CAPK is used to ensure the card data has not been tampered with.
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| * '''SDA Dependency:''' If CAPK is not set or configured correctly in the POS system, Static Data Authentication (SDA) will fail, potentially leading to declined transactions.
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| === Components of CAPK: ===
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| * CAPK consists of several key elements, each playing a significant role in the authentication process:
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| ** '''RID (Registered Application Provider Identifier):''' Identifies the card application provider.
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| ** '''CAPKI (Certification Authority Public Key Index):''' Specifies the particular public key to be used.
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| ** '''Exponent:''' Part of the public key used in the cryptographic process.
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| ** '''Checksum:''' Ensures the integrity of the CAPK data.
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| ** '''Modulus:''' The other part of the public key used for cryptographic calculations.
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| === Implementation in POS Systems: ===
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| * '''Configuration:''' Proper configuration of CAPK in smart POS systems is essential for EMV compliance and effective transaction processing.
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| * '''Updates and Management:''' Regular updates and management of CAPKs are crucial to accommodate new card issuer specifications and security updates.
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| '''Note:'''
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| * The management of CAPKs in smart POS systems is a critical aspect of EMV compliance. Technicians and developers should ensure these keys are accurately configured, regularly updated, and securely managed to maintain the integrity of the EMV transaction process.
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