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The Fiat-Shamir transformation is a widely employed technique in constructing signature schemes, known as Fiat-Shamir signature schemes (FS-SIG), derived from secure identification (ID) schemes. However, the existing security proof only takes into ...

This document specifies the message formats used in OpenPGP. OpenPGP provides encryption with public key or symmetric cryptographic algorithms, digital signatures, compression, and key management.

This document is maintained in order to publish all ...

We construct a digital signature scheme for images that allows the image to be compressed without invalidating the signature. More specifically, given a JPEG image signed with our signature scheme, a third party can compress the image using JPEG ...

CRYSTALS-Dilithium and Falcon are digital signature algorithms based on cryptographic lattices, which are considered secure even if large-scale quantum computers will be able to break conventional public-key cryptography. Both schemes have been selected ...

A recent preprint  [3] suggests the use of polynomials over a tropical algebra to construct a digital signature scheme “based on” the problem of factoring such polynomials, which is known to be NP-hard. This short note presents two very efficient ...

The first generation of post-quantum cryptography (PQC) standards by the National Institute of Standards and Technology (NIST) is just around the corner. The need for secure implementations is therefore increasing. In this work, we address this need and ...

A key-aggregate searchable encryption (KASE) scheme is an encryption scheme that enables a user to search plaintexts under their ciphertexts and control access to the ciphertexts for other users. This paper proposes a generic construction of KASE, ...

Quotable signature schemes are digital signature schemes with the additional property that from the signature for a message, any party can extract signatures for (allowable) quotes from the message, without knowing the secret key or interacting ...

We present a new attack against the PSSI problem, one of the three problems at the root of security of Durandal, an efficient rank metric code-based signature scheme with a public key size of 15 kB and a signature size of 4 kB, presented at ...${\mathrm{}}^{\mathrm{}}$${\mathrm{}}^{\mathrm{}}$

The random oracle model (ROM), introduced by Bellare and Rogaway (CCS 1993), enables a formal security proof for many (efficient) cryptographic primitives and protocols, and has been quite impactful in practice. However, the security model also ...

Trilemma in blockchain refers to the infamous problem of simultaneously not delivering the three critical aspects of a ledger: security, scalability, and decentralisation. While security and scalability hinder decentralisation, security is ...

The proposed technique solves the infamous trilemma issue of blockchain. InterPlanetary File System (IPFS), a P2P‐based off‐chain storage, is utilised to ensure that the security is not compromised while stabilising scalability and decentralisation. image ...

In post-quantum cryptography, hash-based signature schemes are attractive choices because of the weak assumptions. Most existing hash-based signature schemes are proven secure against post-quantum chosen message attacks (CMAs), where the ...

Internet of Things (IoT) and Storage-as-a-Service (STaaS) continuum permit cost-effective maintenance of security-sensitive information collected by IoT devices over cloud systems. It is necessary to guarantee the security of sensitive data in IoT-STaaS ...

Digital signature schemes are used for the authentication and verification of signatures. The Courtois–Finiasz–Sendrier (CFS) digital signature is a well‐known code‐based digital signature scheme based on the Niederreiter cryptosystem. However, ...

A new code‐based digital signature based on McEliece cryptosystems is proposed. To the authors knowledge, the proposed scheme is the first code‐based digital signature based on McEliece with the lower processing time required to construct a valid digital ...

Blockchain technology provides efficient and secure solutions to various online activities by utilizing a wide range of cryptographic tools. In this article, we survey the existing literature on post-quantum secure digital signatures that possess exotic ...

Signature schemes based on the MPC-in-the-head approach (MPCitH) have either been designed by taking a proof system and selecting a suitable symmetric-key primitive (Picnic, CCS16), or starting with an existing primitive such as AES and trying to find ...

Cryptographic signatures can be used to increase the resilience of distributed systems against adversarial attacks, by increasing the number of faulty parties that can be tolerated. While this is well-studied for consensus, it has been underexplored in ...

Public key cryptography plays an essential role in ensuring many security properties required in data processing of various kinds. The theme of this workshop is novel public-key cryptosystems for solving a wide range of real-life application problems. ...

Digital signatures are often used by trusted authorities to make unique bindings between a subject and a digital object; for example, certificate authorities certify a public key belongs to a domain name, and time-stamping authorities certify that ...

In some digital signature schemes, the signer needs to maintain a dynamic state while signing messages. These are called stateful signature schemes. Although stateful signature schemes are commonly used as cryptographic primitives, they do not fit ...