Definition ∞ CCA2 security is a robust cryptographic property ensuring an encryption scheme resists adaptive chosen-ciphertext attacks. This means the system remains secure even if an attacker can request decryptions of chosen ciphertexts. It represents a high standard for data protection in cryptographic protocols. This security level is crucial for maintaining confidentiality against powerful adversaries.
Context ∞ In the domain of digital assets and blockchain technology, CCA2 security holds particular relevance for the ongoing development of post-quantum cryptography. Current cryptographic methods may become vulnerable to future quantum computing capabilities. Ensuring CCA2 security in new cryptographic primitives is vital for protecting digital transactions and sensitive data against sophisticated attacks, maintaining long-term integrity for digital asset protocols.
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