Updatable Public Key Encryption with Strong CCA Security: Security Analysis and Efficient Generic Construction

ePrint Report: Updatable Public Key Encryption with Strong CCA Security: Security Analysis and Efficient Generic Construction

Kyoichi Asano, Yohei Watanabe

With applications in secure messaging, Updatable Public Key Encryption (UPKE) was proposed by Jost et al. (EUROCRYPT '19) and Alwen et al. (CRYPTO '20). It is a natural relaxation of forward-secure public-key encryption. In UPKE, we can update secret keys by using update ciphertexts which any sender can generate. The UPKE schemes proposed so far that satisfy the strong CCA …

analysis applications cca construction crypto encryption eprint report eurocrypt key messaging public public key report secure messaging security security analysis