(Inner-Product) Functional Encryption with Updatable Ciphertexts

ePrint Report: (Inner-Product) Functional Encryption with Updatable Ciphertexts

Valerio Cini, Sebastian Ramacher, Daniel Slamanig, Christoph Striecks, Erkan Tairi

We propose a novel variant of functional encryption which supports ciphertext updates, dubbed ciphertext updatable functional encryption (CUFE). Such a feature further broadens the practical applicability of the functional encryption paradigm and is carried out via so-called update tokens. However, allowing update tokens requires some care for the security definition as we want that updates can be done by any semi-trusted third …

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