A message adversary model defines the capabilities and limitations of an attacker attempting to disrupt communication or compromise security within a network, particularly in distributed systems like blockchains. This model specifies what actions an adversary can perform, such as intercepting, altering, delaying, or dropping messages, and what information they can access. Understanding the adversary model is crucial for designing cryptographic protocols that remain secure even under attack. It informs the robustness requirements for network security.
Context
In the design and analysis of blockchain consensus protocols and secure communication layers, the message adversary model is a fundamental consideration. News reports on protocol upgrades or security audits often refer to the assumed adversary capabilities, such as synchronous or asynchronous networks, and the number of malicious nodes tolerated. The ongoing research focuses on building protocols that offer strong security guarantees against increasingly powerful and sophisticated adversaries.
Researchers deployed erasure-correcting codes and vector commitments to fragment messages, drastically reducing Byzantine Reliable Broadcast communication complexity to near-optimal bounds.
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