Definition ∞ A Passive Network Adversary is an entity that monitors network traffic without actively interfering with or modifying the data flow. This type of adversary aims to gather information, such as transaction details, participant identities, or communication patterns, by observing network activity. Their actions are often difficult to detect because they do not disrupt network operations.
Context ∞ The threat posed by passive network adversaries is a constant consideration in the design of secure and private blockchain protocols. Researchers continually work on cryptographic techniques and network obfuscation methods to protect against such surveillance. Maintaining transactional privacy against these observers remains a significant challenge for decentralized systems.
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