GM/T 0099-2020 in English
VALIDCryptography application technical specification of open fixed layout documents
- Issued on:2020-12-28
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$370.00
$359.00
$359.00
| Standard No: | GM/T 0099-2020 |
| Document status: | VALID |
| Title in English: | Cryptography application technical specification of open fixed layout documents |
| Title in Chinese: | 开放式版式文档密码应用技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-12-28 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 35.040-Character sets and information coding |
| Chinese Classification: | L80-Data encryption |
| Related Topics: | password
Applied technology gm t gm/t document open Flowing Documents vs. Typographic Documents layout file Typography and Flow technology development technology application Flow Document Layout Documentation layout document Kelvin Density Meter GM/T 38636-2020 Open layout file password application Full text of technical specifications made public t/gdwca 0099 |
Introduction
Analysis of the core content of the standard
| Technical Dimensions | Signature Mechanism | Encryption Mechanism | Integrity Protection |
|---|---|---|---|
| Application Scenarios | Authenticity/Non-repudiation | Confidentiality Protection | Tampering/Muggling Detection |
| Algorithm Requirements | SM2/SM3 | SM2/SM4 | SM3 Hash Algorithm |
| Data Structure | Signatures.xml | Encryptions.xml | OFDEntries.xml |
Key Technology Implementation
1. OFD Signature Protocol
Supports two modes: electronic signature and digital signature, recorded through the signature description file (Signature.xml):
- Signature protection range: can specify specific pages or layers
- Timestamp requirements: must comply with GB/T 20520 specifications
- Signature verification process: triple verification mechanism (file hash value comparison, signature verification, protection range verification)
2. Layered encryption scheme
Supports local encryption and Overall encryption:
Government document case: Encrypt and protect the red-headed part of the document, establish a plaintext and ciphertext mapping relationship through EntriesMap.xml, and use the SM2 algorithm for key wrapping
Standard Evolution Analysis
Compared with the traditional PDF security mechanism, this standard has the following features:
- Support for domestic cryptographic algorithms (SM2/SM3/SM4)
- XML structured storage facilitates auditing
- Overlay support for multiple signatures/encryption
Implementation suggestions
Key points for product development
- Strictly follow the algorithm identification specifications in Appendix A
- Implement the six-step signature process specified in 7.2.6
- Support CRL certificate revocation list verification
Detection precautions
- Verify whether the signature value data complies with GB/T 35275
- Check the path resolution of the encrypted mapping table file
- Test the signature verification performance in a multi-signature scenario
Sample only — not a preview of GM/T 0099-2020
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