4 min read
Martin Rupp (guest): 10. February 2023
The “Four Corners” model, also called the “Four Party Scheme”, is utilized in almost all standard card payment systems across the globe. Here, we...
4 min read
Martin Rupp (guest): 01. December 2022
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...
3 min read
Martin Rupp (guest): 22. September 2022
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...
2 min read
Martin Rupp (guest): 10. September 2022
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...
4 min read
Martin Rupp (guest): 16. June 2022
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...
2 min read
Martin Rupp (guest): 10. May 2022
One aspect of key management is dealing with what happens when a symmetric cryptographic key is no longer needed. The section ‘Key Replacement,...
2 min read
Martin Rupp (guest): 31. March 2022
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...
3 min read
Martin Rupp (guest): 26. November 2021
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,...
2 min read
Martin Rupp (guest): 21. October 2021
This article proposes answers to a series of frequently asked questions (FAQs) about key blocks.