How PGP Works
Автор: OTHMAN OMRAN KHALIFA
Загружено: 2026-01-20
Просмотров: 3
What is PGP?
PGP is an encryption program that provides cryptographic privacy and authentication for data communication, primarily used for securing emails, files, and disk partitions.
Core Functions
Encryption/Decryption - Ensures only intended recipients can read messages
Digital Signatures - Verifies sender identity and message integrity
Authentication - Confirms who sent the message
Non-repudiation - Sender cannot later deny sending the message
How It Works (The Hybrid System)
PGP cleverly combines the best of both cryptographic worlds:
Step 1: Symmetric Encryption
Your actual message is encrypted using a fast algorithm (like AES)
Uses a one-time session key
Step 2: Asymmetric Encryption
The session key is encrypted using the recipient's public key
Only their private key can decrypt it
Key Components
Keys
Public Key: Shared with everyone, used to encrypt messages to you
Private Key: Kept secret, used to decrypt messages and create signatures
Web of Trust
PGP's decentralized trust model where users:
Sign each other's public keys
Vouch for the authenticity of keys
Build trust networks instead of relying solely on Certificate Authorities
Common Uses Today
Secure Email (via tools like GnuPG, Enigmail, Mailvelope)
File Encryption
Software Distribution (verifying package integrity)
Protecting sensitive documents
Whistleblower communications
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