Group Signatures with Designated Traceability over Openers’ Attributes

Anada, Hiroaki; Fukumitsu, Masayuki; Hasegawa, Shingo

doi:10.15803/ijnc.12.2_493

Cited by 2 publications

(9 citation statements)

References 22 publications

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“…In this section, we show the correctness and security properties of the scheme. The security proofs follow the proofs given by Bellare et al 2 and Anada et al 20 However, since we decentralized the tracing key generation and used both PKE and CP-ABE schemes, there are some differences in the proof of anonymity. Therefore, we detail the anonymity proof in this section.…”

Section: Correctness and Securitymentioning

confidence: 98%

“…Figures 3 and 4 show the construction of algorithms of user-joining and tracer key generation protocols, respectively. For the building of the scheme we referred to the construction given by Bellare et al 2 and Anada et al 16,20 The algorithm Setup produces public and secret keys for the attributes in the universal attribute set Att. We assume the tracers will receive attribute-secret keys only for their possessing attributes.…”

Section: Constructionmentioning

confidence: 99%

“…Thus, we consider adversaries attacking encryption scheme, who has access to both PKE and CP-ABE schemes. We take an anonymity attacking adversary who can execute PermitOpen and prove the security for IND-CPA as explained by Anada et al 20 We derive our scheme's satisfying properties in the following theorems.…”

Section: Correctness and Securitymentioning

confidence: 99%

“…encryption scheme E is IND-CCA secured, if, for any PPT , Adv ind-cca-b KGen a (msk, ID, A  ) → sk  , and Dec a (sk  , C) → M∕0, where 𝜅 is an index for a constant c, 𝜅 ∈ N c ,20 pp is the public parameters, msk is the master secret key, A  is an access structure for encrypting a message M to a ciphertext C, and sk  is the decryption key for the attribute set A  . Dec a (sk  , C)…”

mentioning

confidence: 99%

“…Thus the adversary gets pk e and has access to the oracles LRO e and DecO e . On the other hand, Anada et al20 considered an adversary against the CP-ABE scheme. Thus, the adversary gets the public key (public parameters) pp and access to the oracles LRO a and KGO a .…”

mentioning

confidence: 99%

See 4 more Smart Citations

Secured tracing for group signatures from attribute‐based encryption

Perera,

Matsunaka,

Yokoyama

et al. 2023

Concurrency and Computation

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SummaryThis article presents a tracing mechanism for group signatures answering the security threats of malicious authorities and users' forgeries. The proposal weakens the high trust placed on the centralized tracing party in previous group signatures by decentralizing tracing power using a multiple tracer setting and limiting the tracers' access using attribute‐based encryption and the requirement of the group manager's agreement. We allow the group manager to control tracers identifying his group users. Instead of a centralized tracer, our setting has multiple tracers possessing attribute sets. Thus, after getting the group manager's permission, a tracer should satisfy the access policy in a given signature to identify the signer. On the other hand, our group signature scheme decentralizes the tracing key generation and removes the group manager's tracing ability. Thus, it ensures that only the attribute‐satisfying and permitted tracers can identify the signer. Moreover, this article delivers security against malicious users. It presents a verification process of access policy of the signatures to prevent users from utilizing invalid attributes for signing. In addition, the article delivers a collaborative tracing mechanism to satisfy attribute sets that a tracer fails to fulfill alone for identifying a signer. Thus, our tracing mechanism ensures security against malicious authorities and group users in group signatures. The article gives the general construction of the scheme and discusses the security.

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Section: Correctness and Securitymentioning

confidence: 98%