We present a new methodology for realizing Ciphertext-Policy Attribute Encryption (CP-ABE)
under concrete and noninteractive cryptographic assumptions in the standard model. Our …

Attribute-based encryption (ABE) generalizes public-key encryption and enables fine-
grained control to encrypted data. However, ABE upends the traditional trust model of public …

In this paper we introduce NTRUSign, an ew family of signature schemes based on solving
the approximate closest vector problem (appr-CVP) in NTRU-type lattices. We explore the …

Digital identities and profiles are precious assets. On one hand they enable users to engage
in transactions and interactions on the Internet. On the other hand, abuses and leakages of …

We investigate a number of issues related to identity based authenticated key agreement
protocols in the Diffie-Hellman family enabled by the Weil or Tate pairings. These issues …

Registration-based encryption (RBE) was recently introduced as an alternative to identity-
based encryption (IBE), to resolve the key-escrow problem: In RBE, the trusted authority is …

Abstract “Certificateless public-key cryptosystem” is a new and attractive paradigm, which
avoids the inherent key escrow property in identity-based public-key cryptosystems, and …

In this paper, we construct an efficient “multi-receiver identity-based encryption scheme”. Our
scheme only needs one (or none if precomputed and provided as a public parameter) …

In this work, we introduce the notion of registration-based encryption (RBE for short) with the
goal of removing the trust parties need to place in the private-key generator in an IBE …

ID-based cryptosystems have many advantages over PKI based cryptosystems in key
distribution, but they also have an inherent drawback of key escrow problem, ie users' …