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ASC/X9 - ANSI X9.124-1

Symmetric Key Cryptography for the Financial Services Industry - Format-Preserving Encryption - Part 1: Definitions and Model

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Organization: ASC/X9
Publication Date: 15 October 2020
Status: active
Page Count: 35
scope:

The ANS X9.124 standard defines a collection of methods for encrypting data strings so that the length and the character set for the ciphertext is the same as those of the plaintext. This is called format-preserving encryption (FPE). These methods are useful in situations where fixed-format data, such as Primary Account Numbers (PANs) or Social Security Numbers (SSNs), must be encrypted, but there is a requirement to limit changes to existing communication protocols, database schemata or application code.

Part 1 of this standard includes a set of definitions common to all FPE techniques, a security model for FPE block cipher techniques, and a description of the pseudocode language used in defining the mode specified in this document.

Part 2 of this standard defines Format-Preserving Encryption - Counter Mode (FPCM) which is a key stream with counter mode method for format-preserving encryption.

Part 3 of this standard defines FF1 mode, which is a block cipher-based format-preserving Feistel-based mode.

Part 4 of this standard defines FF2.1 mode, which is a block cipher-based format-preserving Feistel-based mode.

Part 5 of this standard defines FF3.1 mode, which is a block cipher-based format-preserving Feistel-based mode.

Purpose

The purpose of this standard is to provide approved methods for format-preserving encryption (FPE).

Document History

August 8, 2023
Symmetric Key Cryptography for the Financial Services Industry — Format-Preserving Encryption – Part 1: Definitions and Model
This standard defines a collection of modes for encrypting data strings so that the length and the character set for the ciphertext is the same as those of the plaintext. This is called...
ANSI X9.124-1
October 15, 2020
Symmetric Key Cryptography for the Financial Services Industry - Format-Preserving Encryption - Part 1: Definitions and Model
The ANS X9.124 standard defines a collection of methods for encrypting data strings so that the length and the character set for the ciphertext is the same as those of the plaintext. This is called...

References

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