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"Lattice-Based HRA-secure Attribute-Based Proxy Re-Encryption in Standa" by Willy Susilo, Priyanka Dutta et al.

Proxy re-encryption (PRE), introduced by Blaze, Bleumer, and Strauss at EUROCRYPT 98, offers delegation of decryption rights, i.e., it securely enables the re-encryption of ciphertexts from one key to another, without relying on trusted parties. PRE allows a semi-trusted third party termed as a “proxy” to securely divert ciphertexts of a user (delegator) to another user (delegatee) without revealing any information about the underlying messages to the proxy. Attribute-based proxy re-encryption (ABPRE) generalizes PRE by allowing such transformation of ciphertext under an access-policy into another ciphertext under a new access policy. Such a primitive facilitates fine-grained secure sharing of encrypted data in the cloud. In order to capture the application goals of PRE, the security model of (Attribute-based) PRE evolves over the decades. There are two well-established notions of security for (Attribute-based) proxy re-encryption schemes: security under chosen-plaintext attacks (C ....

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"Blockchain based Multi-Authority Fine-Grained Access Control System wi" by Meiyan Xiao, Qiong Huang et al.

"Blockchain based Multi-Authority Fine-Grained Access Control System wi" by Meiyan Xiao, Qiong Huang et al.
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