Public Key Infrastructure (PKI)
⏱ Estimated reading time: 1 min
Definition:
PKI is a framework that uses digital certificates and cryptographic keys to provide secure communication, authentication, and data integrity over networks.
Key Components
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Public Key & Private Key – A pair of keys for encryption and decryption in asymmetric cryptography.
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Certificate Authority (CA) – Issues and manages digital certificates to verify identities.
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Registration Authority (RA) – Verifies user identities before certificates are issued.
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Digital Certificates – Electronic documents that link public keys to verified entities.
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Certificate Repository – Stores issued certificates for public verification.
Functions of PKI
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Authentication: Verifies the identity of users or devices
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Encryption: Secures data during transmission
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Digital Signatures: Ensures integrity and non-repudiation of messages
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Key Management: Handles generation, distribution, and revocation of keys
Applications
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Secure email (S/MIME)
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Online banking and e-commerce
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VPNs and secure web communication (HTTPS)
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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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