Data Encryption
Transforming data into an unreadable format using cryptographic algorithms. Encryption at rest protects stored data; encryption in transit protects data over the network.
What is Data Encryption?
Transforming data into an unreadable format using cryptographic algorithms. Encryption at rest protects stored data; encryption in transit protects data over the network.
Data Encryption is a intermediate-level concept that sits in the Data Governance & Compliance area of system design. Engineers reach for it whenever they need to reason about real-world trade-offs in that space — not just for textbook correctness, but because real production systems at companies like Netflix, Amazon, and Google make these decisions every day.
If you want to go deeper than this definition — with diagrams, code, and a quiz to lock it in — work through the "Data Encryption" lesson linked below. It walks through the why, the mechanism, the trade-offs, and how the giants actually use it in production.
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Full interactive lesson with diagrams, code examples, real-world references, and a quiz.
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Related glossary terms you might want to look up next.
SSL/TLS
Cryptographic protocols that encrypt data in transit between client and server. TLS is the modern successor to SSL. The 'S' in HTTPS.
PII
Personally Identifiable Information: any data that can identify a specific individual, like name, email, SSN, or IP address. Must be encrypted and access-controlled.
GDPR
General Data Protection Regulation: EU law governing how personal data is collected, stored, and processed. Requires consent, data portability, and the right to be forgotten.