Extending Updatable Encryption: Public Key, Tighter Security and Signed Ciphertexts

ePrint Report: Extending Updatable Encryption: Public Key, Tighter Security and Signed Ciphertexts

Chen Qian, Yao Jiang Galteland, Gareth T. Davies

Updatable encryption is a useful primitive that enables key rotation for storing data on an untrusted storage provider without the leaking anything about the plaintext or the key. In this work, we make two contributions. Firstly, we extend updatable encryption to the public-key setting, providing its security model and three different efficient constructions. Using a public-key updatable encryption scheme, a …

chen data encryption eprint report key plaintext public public key report rotation security storage the key untrusted