Algebraic Attack on FHE-Friendly Cipher HERA Using Multiple Collisions

ePrint Report: Algebraic Attack on FHE-Friendly Cipher HERA Using Multiple Collisions

Fukang Liu, Abul Kalam, Santanu Sarkar, Willi Meier

Fully homomorphic encryption (FHE) is an advanced cryptography technique to allow computations (i.e., addition and multiplication) over encrypted data. After years of effort, the performance of FHE has been significantly improved and it has moved from theory to practice. The transciphering framework is another important technique in FHE to address the issue of ciphertext expansion and reduce the client-side computational overhead. …

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