Definition ∞ Proxy Re-Encryption is a cryptographic technique that allows a proxy entity to transform ciphertext from one public key to another without decrypting the data itself. This enables secure delegation of access rights to encrypted information without revealing the underlying content to the proxy or the original data owner. It is particularly useful in decentralized systems for sharing encrypted data while maintaining privacy. This method ensures that only authorized recipients can access the decrypted data.
Context ∞ The application of Proxy Re-Encryption is becoming increasingly relevant for privacy-preserving data sharing in decentralized applications and cloud storage solutions. A key discussion involves the security assumptions of the proxy and the prevention of collusion attacks. Critical future developments include the standardization of efficient and provably secure Proxy Re-Encryption schemes to facilitate robust privacy features across various blockchain platforms.
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