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A revocable hierarchical identity-based broadcast encryption method and system

A broadcast encryption and identity technology, applied in the field of information security, can solve the problem that HIBBE does not have an effective and safe revocation mechanism, and achieve good revocation and encryption performance

Active Publication Date: 2018-12-21
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

[0004] In addition, Seo et al. developed RHIBE's RIBE scheme, users can assign keys and update keys to their sub-users in a tree structure, sharing the burden of PKG, but HIBBE has no effective and secure revocation mechanism

Method used

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  • A revocable hierarchical identity-based broadcast encryption method and system
  • A revocable hierarchical identity-based broadcast encryption method and system
  • A revocable hierarchical identity-based broadcast encryption method and system

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Embodiment Construction

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] The following describes the revocable hierarchical identity-based broadcast encryption method and system according to the embodiments of the present invention with reference to the accompanying drawings. First, the revocable hierarchical identity-based broadcast encryption method according to the embodiments of the present invention will be described with reference to the accompanying drawings .

[0030] figure 1 It is a flowchart of a revocable hierarchical identity-based broadcast encryption method according to an embod...

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Abstract

The invention discloses a revocable hierarchical identity-based broadcast encryption method and system, wherein, the method comprises the following steps: obtaining selectively bounded revocable identity vector set for RHIBBE by ciphertext pair and indistinguishability of selecting plaintext attack, and determining security concept; Constructing the RHIBBE scheme on the prime order bilinear group,in which the broadcast identification vector set is used as a single identification vector in HIBE to perform encryption of similar principle, and when decrypting, eliminating the redundant identityin the set to ensure that the ciphertext is decrypted by the corresponding decryption key, thus completing the construction scheme. It is proved that the scheme is based on the IND of decision wBDHI hypothesis-SBRIVS-CPA security to prove the security of the scheme. By constructing two concrete RHIBBE schemes on prime bilinear groups, RHIBBE has good performance of revocation and encryption, and can be revoked effectively on initial bilinear groups.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a revocable hierarchical identity-based broadcast encryption method and system. Background technique [0002] In 2014, Liu et al. first proposed Hierarchical Identity-Based Broadcast Encryption (HIBBE) which combines the functions of Hierarchical Identity Encryption (HIBBE) and Broadcast Encryption (BE). In the HIBBE system, users are organized in a tree structure, and they can distribute private keys to subordinate users, thereby reducing the workload of the private key generator (PKG). If the sender needs to encrypt the same message to a large number of recipients, instead of encrypting each recipient separately, the message is encrypted only once, thereby reducing computational costs and saving communication bandwidth. For example, consider the scenario of sending a message to Alice, Bob, etc. via email. A user can use the public key to encrypt information, such...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L9/30H04L9/00
CPCH04L9/002H04L9/0847H04L9/0891H04L9/3073
Inventor 关振宇刘建伟李大伟李云浩
Owner BEIHANG UNIV
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