On the Security of Universal Re-Encryption

ePrint Report: On the Security of Universal Re-Encryption

Fabio Banfi, Ueli Maurer, Silvia Ritsch

A universal re-encryption (URE) scheme is a public-key encryption scheme enhanced with an algorithm that on input a ciphertext, outputs another ciphertext which is still a valid encryption of the underlying plaintext. Crucially, such a re-encryption algorithm does not need any key as input, but the ciphertext is guaranteed to be valid under the original key-pair. Therefore, URE schemes lend themselves naturally as building blocks of …

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