CRYPTOMATHIC BLOG

 

ANSI X9.24

Cardholder, Merchant, Issuer & Acquirer - The Four Corners Model for Payment Security and Key Management

4 min read

Payment Security & Key Management: The Four Corners Model

The “Four Corners” model, also called the “Four Party Scheme”, is utilized in almost all standard card payment systems across the globe. Here, we...

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TR-34 Key Blocks for the TR-34 Exchange Protocol: Basic Principles

4 min read

TR-34 Key Blocks for the TR-34 Exchange Protocol: Basic Principles

Among all the various key block formats, the TR-34 format is undoubtedly one of the most sophisticated. The TR-34 norm is an implementation of the...

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3 min read

How EMV Payment Security Works for Issuers

An issuer is one of the corners in the ‘four corner’ model. An issuer is a financial organization (e.g. a bank) that produces payment cards and...

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An Overview of the Different Key Block Formats

2 min read

Understanding Key Block Formats and Applications

A key block is a unique piece of cryptography that is used to protect cryptographic keys while they are being sent over networks that might not be...

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Payment Security - Cardholders

4 min read

EMV Payment Security for Cardholders: Overview & Practices

Cardholders (or consumers) are one of the corners of the ‘four corner’ model in the payment card world. Here we take a brief look at the payment...

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ANSI X9.24-1-2017: Key Replacement, Destruction, and Archiving

2 min read

ANSI X9.24-1-2017: Key Replacement, Destruction, and Archiving

One aspect of key management is dealing with what happens when a symmetric cryptographic key is no longer needed. The section ‘Key Replacement,...

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2 min read

ANSI X9.24-1-2017: A Guide to Key Loading Standards

The ANSI X9.24-1-2017 standard defines the requirements for the loading of key components or shares, and the loading of cleartext keys. The loading...

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Why a Key Management System Must Understand ANSI X9.24/TR-31 Key Blocks

3 min read

Why Key Management Systems Require X9.24/TR-31 Blocks

The PCI Council requires most actors of payment networks to implement ANSI X9.24/TR-31-compliant key blocks to wrap and securely transmit, transfer,...

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Introduction to Cryptographic Key Blocks - FAQs

2 min read

FAQs on Cryptographic Key Blocks and Their Use

This article proposes answers to a series of frequently asked questions (FAQs) about key blocks.

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