RFC 2440:OpenPGP Message Format
RFC-Ref

OpenPGP Message Format


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

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