ISO/IEC 10118-1:2016/Amd 1:2021

Overview

ISO/IEC 10118-1:2016/Amd 1:2021 is an important amendment to the international standard covering information technology security techniques related to hash functions. This amendment specifically addresses padding methods for sponge functions, a critical component in modern cryptographic hash algorithm design.

The document is part of the ISO/IEC 10118 series, developed by the Joint Technical Committee ISO/IEC JTC 1, Subcommittee SC 27, focusing on information security, cybersecurity, and privacy protection. This amendment enhances the general framework defined in Part 1 of the standard by introducing updates and clarifications on padding schemes applied to data input in sponge-based hash functions.

Key Topics

• Padding Methods for Sponge Functions
  The amendment introduces a new standardized padding method, Pad10*1, which improves the consistency and security of data processing in sponge constructions.

  • Pad10*1 starts with appending a single '1' bit to the data.
  • Followed by appending the required number of '0' bits to align with the sponge function’s block length minus two bits.
  • Finally, a single '1' bit is appended to complete the padding.

• Purpose of Padding in Hash Functions
  Padding ensures that data input conforms to the required block sizes of sponge constructions, preventing ambiguity in message lengths and collisions. It is a fundamental step for maintaining integrity and collision resistance in hash computations.

• Sponge Function Framework
  Sponge functions are versatile cryptographic primitives used in hash algorithms such as SHA-3. The amendment’s focus on padding methods ensures interoperability and robustness in these implementations.

Applications

• Cryptographic Hash Functions
  This standard amendment is directly applicable to designing or implementing cryptographic hash functions based on sponge architectures. It is crucial for developers and researchers working on secure hash algorithms to incorporate Pad10*1 for proper padding.

• Data Integrity and Authentication
  Padding methods defined here contribute to the security assurance of systems relying on hash functions for data authentication, digital signatures, and integrity verification.

• Cybersecurity and Privacy Protection
  Organizations adopting ISO/IEC 10118-1 and its amendments can strengthen their information security frameworks by adhering to the latest cryptographic standards ensuring resistance against attacks that exploit padding vulnerabilities.

• Standard Compliance and Interoperability
  Compliance with this amendment aids in achieving conformity with international standards, promoting confidence and trust in IT products across global markets.

Related Standards

ISO/IEC 10118-1:2016/Amd 1:2021 aligns with and complements several other international standards:

• ISO/IEC 10118 Series
  The broader series on cryptographic techniques related to hash functions, detailing different parts including abstract models, recommended algorithms, and test vectors.

• ISO/IEC 18033 Series
  Standards outlining encryption methods that often work alongside hash functions in secure communication systems.

• ISO/IEC 27000 Series
  Information security management systems standards that reference cryptographic controls like those detailed in ISO/IEC 10118-1.

• NIST FIPS 202
  Though a national standard, it specifies SHA-3 functions which utilize sponge constructions, making this amendment relevant for international harmonization with NIST methods.

Adhering to ISO/IEC 10118-1:2016/Amd 1:2021 ensures that organizations implement secure and standardized padding methods for sponge-based hash functions, essential for modern cryptographic security, interoperability, and compliance in information technology environments. For detailed guidance and official documentation, users should consult the ISO website and authorized national standards bodies.