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Diagram of an Onus installment transaction flow between POS and HOST

Payment Systems

What are the key points in an Onus Installment project?

Before describing the Onus Installment process, it is better to first answer: what is an Onus transaction? An Onus transaction is when the acquirer and issuer are the same institution, so the transaction is processed through that institution.

Diagram illustrating the structure of ISO 8583 Field 53, PIN Encryption Control Information

Online & Authorization

ISO 8583 Field Descriptions (F53)

F53 - PIN Encryption Control Information. When online PIN data is present, sending the F53 value is mandatory, except when DUKPT information is carried in Field 63, Tag 01. F53 consists of the following components.

Diagram of PIN Encryption Key (PEK) structure

HSM & Security

What is PEK (Pin Encryption Key)?

PEK is the abbreviation for Pin Encryption Key. The role of PEK is to encrypt PINs. There are two types of PEK: TPK (Terminal Pin Key) and ZWK (Zone Working Key).

Diagram illustrating the Local Master Key (LMK) concept in an HSM

HSM & Security

LMK (Local Master Key)

LMK stands for Local Master Key. The Local Master Key (LMK) is the HSM's master key, and all other keys used by the institution are secured under this key. As transaction volume increases, banks often use multiple HSMs to reduce the load on each device.

Architecture diagram of the Visa EAS Server within the Visa Secure 3-D Secure authentication flow

EMV

What Is the Visa EAS Server?

The Visa EAS Server (Extended Access Service) is a server used in Visa’s authentication infrastructure. It was developed to run the cardholder authentication process securely between banks and the Visa network, particularly within Visa Secure (3-D Secure 2.x).

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Payment Systems

What Is ISO/TC 68?

ISO/TC 68 is a technical committee within the International Organization for Standardization in Geneva, responsible for developing and maintaining international standards for banking, securities and other financial services.