RFC2440 and GnuPG

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Preface

Table of Contents

• 1. Introduction
  • 1.1. Terms
• 2. General functions
  • 2.1. Confidentiality via Encryption
  • 2.2. Authentication via Digital signature
  • 2.3. Compression
  • 2.4. Conversion to Radix-64
  • 2.5. Signature-Only Applications
• 3. Data Element Formats
  • 3.1. Scalar numbers
  • 3.2. Multi-Precision Integers
  • 3.3. Key IDs
  • 3.4. Text
  • 3.5. Time fields
  • 3.6. String-to-key (S2K) specifiers
  • 3.6.1. String-to-key (S2k) specifier types
  • 3.6.1.1. Simple S2K
  • 3.6.1.2. Salted S2K
  • 3.6.1.3. Iterated and Salted S2K
  • 3.6.2. String-to-key usage
  • 3.6.2.1. Secret key encryption
  • 3.6.2.2. Symmetric-key message encryption
• 4. Packet Syntax
  • 4.1. Overview
  • 4.2. Packet Headers
  • 4.2.1. Old-Format Packet Lengths
  • 4.2.2. New-Format Packet Lengths
  • 4.2.2.1. One-Octet Lengths
  • 4.2.2.2. Two-Octet Lengths
  • 4.2.2.3. Five-Octet Lengths
  • 4.2.2.4. Partial Body Lengths
  • 4.2.3. Packet Length Examples
  • 4.3. Packet Tags
• 5. Packet Types
  • 5.1. Public-Key Encrypted Session Key Packets (Tag 1)
  • 5.2. Signature Packet (Tag 2)
  • 5.2.1. Signature Types
  • 5.2.2. Version 3 Signature Packet Format
  • 5.2.3. Version 4 Signature Packet Format
  • 5.2.3.1. Signature Subpacket Specification
  • 5.2.3.2. Signature Subpacket Types
  • 5.2.3.3. Signature creation time
  • 5.2.3.4. Issuer
  • 5.2.3.5. Key expiration time
  • 5.2.3.6. Preferred symmetric algorithms
  • 5.2.3.7. Preferred hash algorithms
  • 5.2.3.8. Preferred compression algorithms
  • 5.2.3.9. Signature expiration time
  • 5.2.3.10. Exportable Certification
  • 5.2.3.11. Revocable
  • 5.2.3.12. Trust signature
  • 5.2.3.13. Regular expression
  • 5.2.3.14. Revocation key
  • 5.2.3.15. Notation Data
  • 5.2.3.16. Key server preferences
  • 5.2.3.17. Preferred key server
  • 5.2.3.18. Primary user id
  • 5.2.3.19. Policy URL
  • 5.2.3.20. Key Flags
  • 5.2.3.21. Signer's User ID
  • 5.2.3.22. Reason for Revocation
  • 5.2.4. Computing Signatures
  • 5.2.4.1. Subpacket Hints
  • 5.3. Symmetric-Key Encrypted Session-Key Packets (Tag 3)
  • 5.4. One-Pass Signature Packets (Tag 4)
  • 5.5. Key Material Packet
  • 5.5.1. Key Packet Variants
  • 5.5.1.1. Public Key Packet (Tag 6)
  • 5.5.1.2. Public Subkey Packet (Tag 14)
  • 5.5.1.3. Secret Key Packet (Tag 5)
  • 5.5.1.4. Secret Subkey Packet (Tag 7)
  • 5.5.2. Public Key Packet Formats
  • 5.5.3. Secret Key Packet Formats
  • 5.6. Compressed Data Packet (Tag 8)
  • 5.7. Symmetrically Encrypted Data Packet (Tag 9)
  • 5.8. Marker Packet (Obsolete Literal Packet) (Tag 10)
  • 5.9. Literal Data Packet (Tag 11)
  • 5.10. Trust Packet (Tag 12)
  • 5.11. User ID Packet (Tag 13)
• 6. Radix-64 Conversions
  • 6.1. An Implementation of the CRC-24 in "C"
  • 6.2. Forming ASCII Armor
  • 6.3. Encoding Binary in Radix-64
  • 6.4. Decoding Radix-64
  • 6.5. Examples of Radix-64
  • 6.6. Example of an ASCII Armored Message
• 7. Cleartext signature framework
  • 7.1. Dash-Escaped Text
• 8. Regular Expressions
• 9. Constants
  • 9.1. Public Key Algorithms
  • 9.2. Symmetric Key Algorithms
  • 9.3. Compression Algorithms
  • 9.4. Hash Algorithms
• 10. Packet Composition
  • 10.1. Transferable Public Keys
  • 10.2. OpenPGP Messages
  • 10.3. Detached Signatures
• 11. Enhanced Key Formats
  • 11.1. Key Structures
  • 11.2. Key IDs and Fingerprints
• 12. Notes on Algorithms
  • 12.1. Symmetric Algorithm Preferences
  • 12.2. Other Algorithm Preferences
  • 12.2.1. Compression Preferences
  • 12.2.2. Hash Algorithm Preferences
  • 12.3. Plaintext
  • 12.4. RSA
  • 12.5. Elgamal
  • 12.6. DSA
  • 12.7. Reserved Algorithm Numbers
  • 12.8. OpenPGP CFB mode
• 13. Security Considerations
• 14. Implementation Nits
• 15. Authors and Working Group Chair
• 16. References
• 17. Full Copyright Statement

Updated: 1999-09-30 wkoch