Anonymous credentials are a powerful tool for making assertions about identity while
maintaining privacy and have been the subject of study for many years. The interest in …

Due to its salient features, such as immutability and auditability, blockchain is becoming
more integrated into the Internet of Things (IoT) for enhancing security and developing a …

We propose an anonymous authentication protocol that supports time-bound credentials for
an efficient revocation. It is especially suitable for large-scale network in roaming scenario …

Group signature supports users to generate signatures on behalf of the group. Verifier local
revocation (VLR) is an important method to revoke a misbehaving user in group signature …

Electronic health record (EHR) sharing schemes are widely used in healthcare, medical,
and research. However, privacy may be a concern for patients with EHRs. In this paper, a …

In this paper we propose a novel abstraction that we have named Range-Revocable
Pseudonyms (RRPs). RRPs are a new class of pseudonyms whose validity can be revoked …

Crowdsensing requires scalable privacy-preserving authentication that allows users to send
anonymously sensing reports, while enabling eventual anonymity revocation in case of user …

Group signature is a major cryptographic tool allowing anonymous access to a service.
However, in practice, access to a service is usually granted for some periods of time, which …

Group signatures are active cryptographic topics where group members are granted right to
sign messages anonymously on behalf of their group. However, in practical applications …

Chu et al.(ASIACCS 2012) proposed group signature with time-bound keys (GS-TBK),
where each signing key is associated with expiry time τ. In addition, to prove membership of …