ISO/TS 32004 Document management — Portable Document Format — Integrity protection in encrypted documents in PDF 2.0 is a PDF 2.0 extension Technical Specification (TS) currently being drafted by ISO TC 171 SC 2 WG 8.
It extends PDF 2.0 to also provide integrity protection along with confidentiality. AES-CBC encryption mode used in PDF 2.0 encryption, by itself, only provides confidentiality of the content and requires other mechanism like Message Authentication Code (MAC) to protect its integrity. This technical specification describes an extension to the PDF 2.0 Encryption to provide integrity protection in a backward-compatible way. It extends the ISO 32000-2 (PDF 2.0) specification by adding extensions to the Encrypt dictionary and trailer dictionary to provide integrity protection to the encrypted PDF document while maintaining backward-compatibility.
This document is IN DEVELOPMENT at this time.