One Private Broadcast Encryption Scheme Revisited

Lihua Liu ； Yang Li ； Zhengjun Cao ； Zhen Chen

《International Journal of Electronics and Information Engineering》 7卷2期 (2017/12) Pp. 88-95

https://doi.org/10.6636/IJEIE.201712.7(2).05

摘要

The cryptographic primitive of private broadcast encryption introduced by Barth, Boneh and Waters, is used to encrypt a message for several recipients while hiding the identities of the recipients. In BBW construction, a recipient has to first decrypt the received ciphertext in order to extract the verification key for one-time signature. The recipient then uses the verification key to check whether the ciphertext is malformed. The BBW construction did not consider that information delivered over a channel, especially over a broadcast channel, should be authenticated as to its origin. We would like to stress that the conventional public key signature suffices to authenticate data origin and filter out all malformed ciphertexts. We also discuss the disadvantages of the primitive of one-time signature used in BBW construction.

關鍵字

Key Management ； Man-in-middle Attack ； One-time Signature ； Private Broadcast En-cryption