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"Forward-Secure Group Encryptions from Lattices" by Jing Pan, Xiaofeng Chen et al.

Group encryption (GE) is a fundamental anonymity primitive analogue of group signature, which guarantees the decryption ability of recipients to specific ciphertexts while hiding these users within a crowd. Since its first birth by Kiayias et al., numerous constructions have been proposed, among which there is only one lattice-based scheme is post-quantum secure. However, the security of all these schemes will be damaged once an unexpected key-exposure attack occurs (which is extremely unavoidable in the real world). To solve this problem, we first consider a forward-secure group encryption primitive and provide a concrete instantiation over lattices, which efficiently mitigates the threats from both key exposure and quantum computation. The key idea is to introduce an appropriate periodical key-updating mechanism into the group encryptions to restrain any key-exposure adversary from breaking ciphertexts generated in prior time periods. Concretely, we modify the Agrawal-Boneh-Boyen HIB ....

Agrawal Boneh Boyen Hibes , Short Integer Solution , Learning With Errors , Binary Tree Encryption , Forward Security , Roup Encryption , Ey Updating , Attice Cryptography ,

"Lattice-Based Group Encryption with Full Dynamicity and Message Filter" by Jing Pan, Xiaofeng Chen et al.

Group encryption (GE) is a fundamental privacy-preserving primitive analog of group signatures, which allows users to decrypt specific ciphertexts while hiding themselves within a crowd. Since its first birth, numerous constructions have been proposed, among which the schemes separately constructed by Libert et al. (Asiacrypt 2016) over lattices and by Nguyen et al. (PKC 2021) over coding theory are post-quantum secure. Though the last scheme, at the first time, achieved the full dynamicity (allowing group users to join or leave the group in their ease) and message filtering policy, which greatly improved the state-of-affairs of GE systems, its practical applications are still limited due to the rather complicated design, inefficiency and the weaker security (secure in the random oracle model). In return, the Libert et al.’s scheme possesses a solid security (secure in the standard model), but it lacks the previous functions and still suffers from inefficiency because of extremely us ....

Full Dynamicity , Roup Encryption , Attice Cryptography , Message Filtering , Zero Knowledge ,