Definition ∞ A posterior corruption attack involves manipulating or altering data after it has been initially processed or committed within a system. This refers to a malicious attempt to compromise the integrity of information or system states that have already been recorded or finalized, rather than disrupting ongoing operations. In blockchain contexts, it might exploit weaknesses in historical data verification or the reliance on external, potentially mutable, data sources. Such an attack aims to retroactively invalidate or modify past records, undermining the system’s foundational trust.
Context ∞ Defenses against posterior corruption attacks are a significant aspect of designing secure data storage and retrieval mechanisms, particularly in decentralized archives or verifiable computing systems. Ensuring that committed data remains tamper-proof over extended periods is critical for long-term data integrity. Research focuses on cryptographic techniques and robust data availability layers to prevent such retroactive manipulations.
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