Indistinguishability obfuscation, introduced by [Barak et. al. Crypto 2001], aims to compile
programs into unintelligible ones while preserving functionality. It is a fascinating and …

Isogeny-based assumptions have emerged as a viable option for quantum-secure
cryptography. Recent works have shown how to build efficient (public-key) primitives from …

We introduce a new definition for key updates, called backward-leak uni-directional key
updates, in updatable encryption (UE). This notion is a variant of uni-directional key updates …

Periodic key rotation is a common practice designed to limit the long-term power of
cryptographic keys. Key rotation refers to the process of re-encrypting encrypted content …

Abstract Updatable Encryption (UE) and Proxy Re-encryption (PRE) allow re-encrypting a
ciphertext from one key to another in the symmetric-key and public-key settings, respectively …

The understanding of directionality for updatable encryption (UE) schemes is important, but
not yet completed in the literature. We show that security in the backward-leak uni …

Abstract Updatable Encryption (UE) and Proxy Re-encryption (PRE) allow re-encrypting a
ciphertext from one key to another in the symmetric-key and public-key settings, respectively …

Over the last few years, there has been a surge of new cryptographic results, including
laconic oblivious transfer [13, 16],(anonymous/hierarchical) identity-based encryption [9] …

Efficient (non-interactive) aggregate signature schemes in the post-quantum setting are still
missing. We define the concept of Byzantine fault-tolerant aggregate signature schemes …

Homomorphic encryption enables public computation over encrypted data. In the past few
decades, homomorphic encryption has become a staple of both the theory and practice of …