$$\mathcal {PCS}$$, A Privacy-Preserving Certification Scheme

Kaaniche, Nesrine; Laurent, Maryline; Rocher, Pierre Olivier; Kiennert, Christophe; García-Alfaro, Joaquín

doi:10.1007/978-3-319-67816-0_14

Cited by 11 publications

(14 citation statements)

References 17 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An additional enhancement of the TeSLA architecture toward improved privacy features relies on the use of anonymous certification. As described in, anonymous certification allows to perform a privacy‐friendly access control, in order to certify that users are allowed to access a resource because they own some attributes required by the verifier. Anonymous certification can be naturally integrated to the VLE.…”

Section: Introductionmentioning

confidence: 92%

Integration of an adaptive trust‐based e‐assessment system into virtual learning environments—The TeSLA project experience

Baró-Solé

Rodríguez

Prieto-Blázquez

et al. 2018

Internet Technology Letters

Self Cite

View full text Add to dashboard Cite

E‐assessment is a novel form to evaluate learners' knowledge and skills in online education. Issues concerning security and privacy of learners' data must be guaranteed. Such issues are discussed under the scope of the TeSLA project, a EU‐funded project that aims at providing learners with an innovative environment that allows them to take assessments remotely, thus avoiding mandatory attendance constraints. In this letter, we outline the main concepts underlying TeSLA in terms of security and privacy of learners' data. We also report some technical hands‐on experience conducted by members of the consortium during the pilot phases of the project.

show abstract

Section: Introductionmentioning

confidence: 92%

Integration of an adaptive trust‐based e‐assessment system into virtual learning environments—The TeSLA project experience

Baró-Solé

Rodríguez

Prieto-Blázquez

et al. 2018

Internet Technology Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…The concrete realization of the HABS primitive is presented as unsatisfactory with regard to the unforgeability and privacy properties under the random oracle model. PCS [15], built over HABS, addresses the limitations pointed out by [26,27] is used in this paper as the underlying construction deployed as an AC scheme of TeSLA.…”

Section: Related Workmentioning

confidence: 99%

“…The solution is based on an existing attribute-based signature scheme previously presented in [15]. Our construction relies on the following list of algorithms:…”

Section: Our Constructionmentioning

confidence: 99%

Anonymous Certification for an e-Assessment Framework

Kiennert

Kaaniche

Laurent

et al. 2017

Lecture Notes in Computer Science

Self Cite

View full text Add to dashboard Cite

Abstract. We present an anonymous certification scheme that provides data minimization to allow the learners of an e-assessment platform to reveal only required information to certificate authority providers. Attribute-based signature schemes are considered as a promising cryptographic primitive for building privacy-preserving attribute credentials, also known as anonymous credentials. These mechanisms allow the derivation of certified attributes by the issuing authority relying on noninteractive protocols and enable end-users to authenticate with verifiers in a pseudonymous manner, e.g., by providing only the minimum amount of information to service providers.

show abstract

“…Regardless, we note that ACs with hierarchical delegation have been proposed [4]. Further, a homomorphic ABS scheme [25] has been used to construct non-delegatable anonymous credentials. In this setting, a signer obtains attributes directly from the (multiple) root authorities where combining attributes from different issuers requires an online collaboration.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Attribute-Based Signatures: Short Keys and Optimal Signature Length

Gardham

Manulis

2019

Applied Cryptography and Network Security

View full text Add to dashboard Cite

With Attribute-based Signatures (ABS) users can simultaneously sign messages and prove compliance of their attributes, issued by designated attribute authorities, with some verification policy. Neither signer's identity nor possessed attributes are leaked during the verification process, making ABS schemes a handy tool for applications requiring privacy-preserving authentication. Earlier ABS schemes lacked support for hierarchical delegation of attributes (across tiers of attribute authorities down to the signers), a distinct property that has made traditional PKIs more scalable and widely adoptable. This changed recently with the introduction of Hierarchical ABS (HABS) schemes, where support for attribute delegation was proposed in combination with stronger privacy guarantees for the delegation paths (path anonymity) and new accountability mechanisms allowing a dedicated tracing authority to identify these paths (path traceability) and the signer, along with delegated attributes, if needed. Yet, current HABS construction is generic with inefficient delegation process resulting in sub-optimal signature lengths of order O(k 2 |Ψ |) where Ψ is the policy size and k the height of the hierarchy. This paper proposes a direct HABS construction in bilinear groups that significantly improves on these bounds and satisfies the original security and privacy requirements. At the core of our HABS scheme is a new delegation process based on the length-reducing homomorphic trapdoor commitments to group elements for which we introduce a new delegation technique allowing step-wise commitments to additional elements without changing the length of the original commitment and its opening. While also being of independent interest, this technique results in shorter HABS keys and achieves the signature-length growth of O(k|Ψ |) which is optimal due to the path-traceability requirement.

show abstract

$$\mathcal {PCS}$$, A Privacy-Preserving Certification Scheme

Cited by 11 publications

References 17 publications

Integration of an adaptive trust‐based e‐assessment system into virtual learning environments—The TeSLA project experience

Integration of an adaptive trust‐based e‐assessment system into virtual learning environments—The TeSLA project experience

Anonymous Certification for an e-Assessment Framework

Hierarchical Attribute-Based Signatures: Short Keys and Optimal Signature Length

Contact Info

Product

Resources

About