Although cryptography plays an essential part in most modern
solutions, especially in payments, cryptographic algorithms remain
a black box for most users of these tools. Just as a sane backend
developer does not drill down into low-level disk access details of
a server filesystem, payments professionals have enough things to
worry about before they ever need to bother themselves with
debugging an encrypted value or a message digest. However, at a
certain point, an engineer faces the need to identify a problem
with a particular algorithm or, perhaps, to create a testing tool
that would simulate a counterpart in a protocol that involves
encryption. The world of cryptography has moved on with giant
leaps. Available technical standards mention acronyms and link to
more standards, some of which are very large while others are not
available for free. After finding the standards for the algorithm,
the specific mode of operation must also be identified. Most
implementations use several cryptographic primitives—for example,
key derivation with a block cipher, which produces a secret that is
used together with a hash function and a double padding scheme to
produce a digital signature of a base64-encoded value.
Understanding this requires more sifting through online sources,
more reading of platform and library documents, and finally, when
some code can be written, there are very few test cases to validate
it. Cryptography for Payment Professionals is intended for
technical people, preferably with some background in software
engineering, who may need to deal with a cryptographic algorithm in
the payments realm. It does not cover the payment technology
in-depth, nor does it provide more than a brief overview of some
regulations and security standards. Instead, it focuses on the
cryptographic aspects of each field it mentions. Highlights
include: Major cryptographic algorithms and the principles of their
operation Cryptographic aspects of card-present (e.g., magnetic
stripe, EMV) and online (e.g., e-Commerce and 3DS 2.0) transactions
A detailed description of TDES DUKPT and AES DUKPT protocols, as
well as an example implementation and test cases for both It is
best if the reader understands programming, number and string
representations in machine memory, and bit operations. Knowledge of
C, Python, or Java may make the examples easier to read but this is
not mandatory. Code related to the book is available at the
author’s GitHub site: https://github.com/ilya-dubinsky/cfpp
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