This document specifies how to extend the specifications in ISO 32000-2 by adding support for the use of the Secure Hash Algorithm – 3 (SHA-3) and SHAKE256 hash algorithms. This document does not specify the following: —    specific processes for converting paper or electronic documents to the PDF file format; —    specific technical design, user interface implementation, or operational details of rendering; —    specific physical methods of storing these documents such as media and storage conditions; —    methods for validating the conformance of PDF files or PDF processors; —    required computer hardware and/or operating system