Definition:
PKI is a framework that uses digital certificates and cryptographic keys to provide secure communication, authentication, and data integrity over networks.
Public Key & Private Key – A pair of keys for encryption and decryption in asymmetric cryptography.
Certificate Authority (CA) – Issues and manages digital certificates to verify identities.
Registration Authority (RA) – Verifies user identities before certificates are issued.
Digital Certificates – Electronic documents that link public keys to verified entities.
Certificate Repository – Stores issued certificates for public verification.
Authentication: Verifies the identity of users or devices
Encryption: Secures data during transmission
Digital Signatures: Ensures integrity and non-repudiation of messages
Key Management: Handles generation, distribution, and revocation of keys
Secure email (S/MIME)
Online banking and e-commerce
VPNs and secure web communication (HTTPS)
Digital signatures for documents
Conclusion:
PKI is essential for trustworthy digital communication, enabling secure data exchange and verified identities over the internet.
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