Definition ∞ Existential Unforgeability is a cryptographic property indicating that it is computationally infeasible for an adversary to produce a valid signature for any message not previously signed by the legitimate signer. This property is a fundamental requirement for secure digital signature schemes. It assures that unauthorized parties cannot create new, valid signatures.
Context ∞ The concept of Existential Unforgeability is critical when evaluating the security of digital signatures used in cryptocurrency transactions and blockchain governance. News regarding new cryptographic breakthroughs or vulnerabilities often references this property as a benchmark for security strength. Achieving and maintaining this level of unforgeability is paramount for protecting digital assets from fraudulent activity.
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