Category: Tech – This Explainer

Code signing helps systems verify a software publisher and detect changed files. Learn hashes, certificates, timestamps, trust, and key security.

A Trusted Platform Module protects keys and records system measurements. Learn PCRs, sealing, attestation, uses, and important limitations.

An Internet exchange point lets independent networks exchange traffic directly. Learn peering, switching fabrics, route servers, and the benefits.

Secure Boot verifies trusted startup software before it runs. Learn the chain of trust, key databases, limits, and compatibility tradeoffs.

An API gateway is a controlled entry point between clients and backend services. Learn routing, security policies, aggregation, and tradeoffs.

Checksums help computers detect changed or corrupted data. Here is how they work, where they are used, and what they cannot prove.

A browser cache reuses saved web responses to make repeat visits faster. Learn freshness, validation, directives, and why stale pages appear.

Firmware is software stored close to hardware. Learn how it starts devices, controls components, receives updates, and creates security risks.

This explainer shows how QR codes encode bits in square modules, add orientation and error correction, and are reconstructed by camera software.

This explainer shows how load balancers route traffic among healthy servers, apply selection rules, manage sessions, and improve availability.

This explainer shows how virtual memory translates process addresses, protects applications, loads pages on demand, and uses RAM efficiently.

This explainer shows how database indexes locate rows, support queries, guide query planners, and trade faster reads for storage and write work.