Projects sharing features with Curve25519 Dalek

hashsigs-rs is a Rust cryptography library providing a hash-based signature scheme and a library for generating and verifying one-time digital signatures. It serves as a smart contract signature verifier designed to validate identity and authenticity within on-chain environments. The project implements one-time signature generation and verification to ensure that digital signatures are valid for a single message, preventing key reuse. It supports blockchain authentication workflows and cryptographic identity proofs for validating senders without relying on external servers. The library utili

This project is an OpenPGP cryptography library designed for encrypting, decrypting, and signing messages according to the OpenPGP standard for secure communication. It functions as an asymmetric encryption toolkit for securing data and managing digital identities through cryptographic operations. The library provides a cryptographic key manager to create and handle the public and private key pairs required for identity operations. It includes a digital signature implementation to ensure message authenticity and data integrity. The system covers a broad range of capabilities, including asymm

This project is a comprehensive educational guide and technical manual for the Ethereum blockchain. It provides structured instruction on blockchain fundamentals, smart contract development, and the architectural principles of decentralized applications. The resource covers technical domains including smart contract security auditing, network administration, and web3 programming. It details the implementation of token standards, the use of mnemonic seeds for wallet integration, and the creation of censorship-resistant application architectures. The documentation extends to system-level opera

Signal-iOS is an encrypted messaging client that provides secure communication for voice calls, media, and text. It functions as a complete implementation of the Signal Protocol, utilizing end-to-end encryption to ensure that only intended recipients can access transmitted data. The application distinguishes itself through the integration of advanced cryptographic standards, including the use of elliptic curve cryptography for identity verification and digital signature validation. It employs a double ratchet key exchange mechanism to rotate encryption keys for every individual message, ensur

Libsodium is a portable, C-based cryptographic library that provides a collection of modern primitives for encryption, decryption, digital signatures, password hashing, and secure key exchange. It is designed to facilitate secure communication and data integrity across diverse hardware architectures and operating systems. The library distinguishes itself by utilizing constant-time primitive execution to prevent side-channel attacks and employing memory-hard algorithms to increase the difficulty of brute-force password attacks. It abstracts complex mathematical operations into simplified inter

s2n is a C-based security library and TLS protocol implementation that serves as a secure network transport layer. It provides a modular cryptographic backend interface to encrypt data streams, manage handshakes, and handle mutual authentication between peers. The project focuses on post-quantum cryptography, integrating quantum-resistant key exchange and digital signatures to protect connections against future computing threats. It distinguishes itself through security hardening measures, such as memory-locked secret storage to prevent keys from being swapped to disk and timing-attack mitiga

OpenZeppelin Contracts is a library of modular, secure, and reusable smart contract components designed for the development of decentralized applications. It provides a foundational framework for building standard-compliant contracts, offering battle-tested implementations for token standards, access control, and common utility patterns. The project distinguishes itself through its comprehensive support for complex architectural patterns, including proxy-based upgradeability, role-based access control, and account abstraction. It enables developers to implement modular logic injection via hoo

Deepface is a comprehensive deep learning library for facial recognition and demographic analysis. It provides a modular pipeline that handles the entire lifecycle of facial processing, including detection, geometric alignment, and the transformation of facial images into high-dimensional numerical vector embeddings for identity verification and similarity comparison. The library distinguishes itself through a model ensemble approach, which combines predictions from multiple pre-trained neural networks to improve classification accuracy and reduce bias. It also integrates advanced security fe

Blitzar is a verifiable SQL proof engine and cryptographic library designed for verifiable SQL computation. It enables the execution of database queries off-chain while generating zero-knowledge proofs that certify the correctness of the results for on-chain verification. The project distinguishes itself through a GPU-accelerated proof accelerator that offloads heavy cryptographic workloads to graphics processors, reducing the time required for succinct proof generation. It provides high-performance cryptographic primitives for C++ and Rust applications, focusing on elliptic curve operations

Keys is a library and command-line utility designed for the generation, storage, and lifecycle management of cryptographic keys. It provides tools to create asymmetric key pairs, perform digital signature verification, and implement authenticated encryption to ensure the confidentiality and integrity of sensitive data. The project distinguishes itself by offering a secure storage abstraction that decouples application logic from underlying key storage mechanisms. By utilizing standardized cryptographic protocols, it enables consistent identity verification and data protection across diverse c

itpol is a framework for cryptographic key management, digital signature policies, and security hardening. It provides an IT policy template library and infrastructure access frameworks to establish organizational security guidelines and governance. The project focuses on cryptographic identity management through the use of PGP and SSH keys, alongside a security hardening guide for workstations. It defines standards for software supply chain security, specifically regarding the signing of code commits and software releases to ensure provenance. The system covers a broad range of security cap

ethers.js is an Ethereum JavaScript library used to interact with the Ethereum blockchain by querying state and sending transactions via JSON-RPC providers. It functions as a smart contract wrapper, a Web3 provider interface, and a system for managing wallets and cryptographic signatures. The project provides a dedicated Ethereum Name Service resolver for translating human-readable names into blockchain addresses through forward and reverse lookup operations. It also includes an implementation for managing private keys and mnemonic phrases to sign digital data and authorize on-chain transacti

This project is a curated collection of technical documentation and tutorials designed to guide developers through the mechanics of the Bitcoin blockchain. It serves as a structured learning path for those building applications that interact with decentralized financial systems, covering the fundamental concepts required to implement secure software within the ecosystem. The resource provides a comprehensive curriculum for understanding the core technical pillars of the network, including cryptographic key management, transaction construction, and protocol interaction. By organizing these mat

EOS is a Layer 1 blockchain infrastructure and high-throughput transaction engine. It serves as a WebAssembly smart contract platform that manages state transitions and network consensus across a peer-to-peer network. The system utilizes a sandboxed virtual machine for executing smart contract logic and employs a Byzantine Fault Tolerant delegated proof-of-stake consensus mechanism to finalize the global ledger state. It features a resource-based stake model for CPU and memory allocation and an asynchronous messaging system for inter-contract communication to prevent recursive call overflows.

hashsigs-ts is a TypeScript cryptography library used to generate and verify digital signatures through one-time cryptographic schemes. It functions as a hash-based signature tool that creates secure signatures without relying on asymmetric encryption. The library provides tools for cryptographic identity verification and data integrity validation. It utilizes a one-time signature generation process to ensure that data remains unaltered and that the origin of a message can be proven. The implementation manages raw cryptographic data using typed arrays and employs pure functions to ensure con

Liboqs is a C library that provides a unified interface for quantum-resistant cryptographic algorithms, including key encapsulation and digital signature mechanisms. It is designed to facilitate the integration of post-quantum security into existing protocols and applications, ensuring data protection against future threats from large-scale quantum computers. The library distinguishes itself through a focus on high-assurance implementations and side-channel resistance, utilizing constant-time primitives to prevent timing-based information leakage. It offers extensive build-time configuration,

bitcoinj is a Java library and software development kit for integrating Bitcoin blockchain functionality into applications. It provides a foundation for implementing blockchain clients and managing digital wallets, allowing for the programmatic tracking of blockchain state and transaction histories. The project includes tools for creating and maintaining keychains and wallets, supported by a command-line interface for administrative wallet management and blockchain state synchronization. The library covers core cryptographic and structural primitives, including deterministic key derivation,

hashsigs-solidity is a cryptographic signature library and security utility for Ethereum smart contracts. It functions as a hash-based signature verifier designed to confirm data origin and integrity within a virtual machine environment. The project focuses on on-chain cryptographic authentication, specifically the verification of one-time signatures to prevent replay attacks. It implements signature validation for Winternitz One-Time Signatures Plus to ensure that data has not been tampered with before it is processed by a contract. The library covers a broad range of cryptographic capabili

GmSSL is an open-source cryptographic library that implements the Chinese national cryptographic standards SM2, SM3, SM4, SM9, and ZUC as a unified algorithm suite. It provides a comprehensive set of cryptographic primitives including symmetric and asymmetric encryption, digital signatures, hashing, and key exchange, all built around these national standards for government and enterprise security applications. The library distinguishes itself through several integration capabilities. It includes an OpenSSL compatibility layer that maps GmSSL functions to OpenSSL API calls, enabling drop-in re

Lucia is an authentication library that provides session management, OAuth integration, and password-based login for web applications. It creates and validates server-side sessions using cryptographically random tokens stored in HttpOnly, Secure, SameSite=Lax cookies, with constant-time token comparison to prevent timing side-channel attacks. The library supports authentication through email and password, GitHub OAuth, Google OAuth, and passkey-based sign-in. It enforces two-factor authentication using time-based one-time passwords (TOTP) from authenticator apps, generates recovery codes for

Tink is a multi-language cryptography library and security toolkit providing secure APIs for data encryption and digital signatures. It functions as a data encryption library and digital signature framework designed to prevent common implementation errors across different platforms and operating systems. The project serves as a cryptographic keyset manager, utilizing JSON for the storage, rotation, and serialization of keys to maintain consistency across various programming languages. It ensures identical cryptographic behavior globally by mapping language-specific libraries to a unified set

electron-builder is a cross-platform build automator and packaging tool for Electron applications. It bundles source code and dependencies into platform-specific installers, portable executables, and app store formats for Windows, macOS, and Linux. The project functions as a distribution pipeline that orchestrates the signing and notarization of binaries to ensure authenticity and bypass security warnings. It also serves as an auto-update orchestrator, preparing application packages and distribution channels to support automatic background software updates. Its capability surface covers the

Grin is a protocol implementation and blockchain node that provides a confidential transaction system. It uses Pedersen Commitments and homomorphic encryption to verify value integrity and ensure a consistent money supply without revealing specific transaction amounts or participant identities. The project distinguishes itself through an interactive transaction exchange model, where wallets coordinate multi-round data exchanges to build signed transactions. To maintain anonymity, the system supports onion-routed transaction delivery and masks originating IP addresses through specialized relay

Reticulum is a decentralized networking stack that enables encrypted, peer-to-peer communication over diverse physical mediums without relying on central infrastructure or IP protocols. It uses self-sovereign cryptographic identities for routing and authentication, replacing traditional IP addresses with collision-free globally unique addresses that require no central coordination. Every packet is encrypted by default using ephemeral key exchanges with forward secrecy, and unencrypted traffic is dropped as invalid. The stack unifies heterogeneous transport mediums—including LoRa radio, packet

Tachyon is a suite of hardware-accelerated engines and modular infrastructure for generating succinct non-interactive arguments of knowledge and polynomial commitments. It provides a GPU-accelerated zero-knowledge proof backend and a prover system designed to construct proofs from high-level circuit descriptions. The project distinguishes itself through a GPU cryptographic accelerator that offloads elliptic curve operations, field arithmetic, and cryptographic hashes to graphics hardware. This infrastructure includes a specialized polynomial commitment engine and modular components that allow

This project is a toolkit for reverse engineering, modifying, and re-signing Android application packages. It provides a suite of utilities designed to decompile compiled binary files into readable source code and translate low-level bytecode into formats suitable for human analysis. The tool facilitates security auditing and research by allowing users to extract and interpret manifest metadata, decode Unicode sequences, and inspect internal application logic. Beyond analysis, it supports the modification of application packages, enabling users to rebuild and re-align files to optimize perfor

This project is a portable implementation of the secure shell toolset designed for deployment across diverse operating systems and platforms. It provides a suite of tools for secure remote login and command execution based on the secure shell protocol. The implementation includes a sandboxed server that isolates processes to limit the impact of potential vulnerabilities on the host operating system. It also functions as a cryptographic key manager for generating and storing security keys to replace or supplement password-based authentication. The project covers encrypted file transfer for mo