Definition ∞ A mobile adversary model is a security model that considers an attacker’s ability to compromise different parts of a distributed system over time, rather than a fixed set of nodes. In blockchain contexts, this implies an adversary can move their attack capabilities across various network participants or geographical locations. This model presents a more realistic and challenging scenario for designing robust security protocols. It requires mechanisms that remain secure even when the set of honest participants changes dynamically.
Context ∞ The mobile adversary model is a sophisticated framework used in cryptographic research to design highly resilient distributed ledger technologies. It is particularly relevant for public, permissionless blockchains where participants are anonymous and can join or leave at any time. Discussions often involve the theoretical security guarantees of consensus algorithms under such dynamic attack conditions, aiming to build more robust and censorship-resistant digital asset systems.
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