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Matching “who talks” with “who receives” by timing and patterns.

Definition

Traffic correlation is linking network traffic by comparing timing and patterns, even if content is encrypted.

In plain English Matching “who talks” with “who receives” by timing and patterns.

Why this matters

Why it matters: It can reveal who is communicating with whom, which is sensitive metadata.

Example

Example: Someone watches network timing to guess that a user is visiting a certain service.