In this work, we present HIBE and ABE schemes which are “unbounded” in the sense that
the public parameters do not impose additional limitations on the functionality of the …

Key escrow is inherent in identity-based encryption (IBE). A curious key generation center
(KGC) can simply generate the user's private key to decrypt a ciphertext. However, can a …

Non-interactive key exchange (NIKE) is a fundamental but much-overlooked cryptographic
primitive. It appears as a major contribution in the ground-breaking paper of Diffie and …

Lossy encryption was originally studied as a means of achieving efficient and composable
oblivious transfer. Bellare, Hofheinz and Yilek showed that lossy encryption is also selective …

We initiate the study of security for key-dependent messages (KDM), sometimes also known
as “circular” or “clique” security, in the setting of identity-based encryption (IBE) …

We provide constructions of (m, 1)-programmable hash functions (PHFs) for m≥ 2.
Mimicking certain programmability properties of random oracles, PHFs can, eg, be plugged …

This paper describes two identity based encryption (IBE) protocols in the multi-receiver
setting. The first protocol is secure in the selective-ID model while the second protocol is …

The notion of identity-based encryption (IBE) was proposed as an economical alternative to
public-key infrastructures. IBE is also a useful building block in various cryptographic …

H04L9/3073—Public key, ie encryption algorithm being computationally infeasible to invert
or user's encryption keys not requiring secrecy involving algebraic varieties, eg elliptic or …

This paper describes the first constructions of identity-based broadcast encryption (IBBE)
using Type-3 pairings, which can be proved secure against adaptive-identity attacks based …