关键词: 格, 错误学习问题, 广播加密, 基于身份加密, 盆景树

Abstract:

To design a post-quantum secure broadcast encryption scheme, by using the bonsai trees model, an identity-based broadcast encryption scheme over lattice is proposed. The proposed scheme can avoid the decryption failure problem in the existing scheme. The new scheme is provable securied against chosen-plaintext attack where the security is reduced to the hardness of learning with errors in the standard model. Moreover the proposed scheme supports the dynamic expansion of client and deals with the setting of stateless receivers.

Key words: lattice, learning with errors, broadcast encryption, identity-based encryption, bonsai trees