C

cryptography

Leonardus is an open source project. It is a minimalist, stack-based programming system designed as a flexible framework for implementing and exploring algorithms. The syntax and semantics of its scripting language, LeoScript, are inspired by PostScript and Forth. It is extended with a prototype-based, object-oriented paradigm, has seamless integration into JupyterLab and Docker, and provides a concise and expressive environment for learning and experimentation.

The project name is a nod to Leonardus Pisanus, who was named and became known as Fibonacci.

Consult the project's GitLab Pages for documentation.

End-to-end integration harness and demonstration suite for the EVALinux Crypto Suite (CBOR FIDO, ECC Constant, PQC Constant, DBus Native, and TPM2 TSS).

Constant-time Ed25519 digital signatures and X25519 ECDH key agreement for Crystal backed by libsodium guarded memory and page protection.

QUIC-native TLS 1.3 implementation in Zig. RFC 8446/9001 compliant with zero external dependencies.

A package that handles key pair generation and encryption / decryption of secrets using keys

CryptoLyzer is a fast, flexible, and comprehensive server cryptographic protocol (TLS, SSL, SSH, DNSSEC) and related setting (HTTP headers, DNS records) analyzer and fingerprint (JA3, HASSH tag) generator with Python API and CLI.

Cryptographic protocol and security-related protocol piece parser.

Free repository of cryptography-related data.

🚀 Warum ich Stego-Lab entwickelt habe:

• Private Archivierung: Ich bette meine sensiblen Dokumente einfach unsichtbar in ganz normale Urlaubsfotos ein. • Urheberrechtsschutz: Als Content Creator nutze ich unsichtbare Signaturen, um meine Werke zu schützen, ohne das Design durch Wasserzeichen zu stören. • Fotografie & Social Media: Ich bereinige meine EXIF-Daten und entferne GPS-Koordinaten, bevor ich Bilder teile, um meinen Standort privat zu halten. • Journalismus & Beweissicherung: Sensibles Material kann ich hochgradig verschlüsselt direkt in Bilddateien verstecken. • Effizienz durch Batch-Modus: Wenn ich hunderte Bilder habe, setze ich Wasserzeichen oder Copyright-Infos für die ganze Sammlung in einem Rutsch.

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Zig Hardware Security Module library for PIV, CAC, and YubiKey tokens via PC/SC. Supports certificates, PIN management, signing, and decryption.

scared is a side-channel analysis framework.

A Rust end-to-end encryption library (e2eel) for key management using a Directed Acyclic Graph (DAG) of encrypted keys

Hardware-bound & Cloud-gated binary execution, cryptographic provenance, and anti-tamper envelope sealing for Crystal.

Motley assortment of cryptographic primitives, OpenSSH, DNS. The name means "zeal".

Five classic ciphers (A1Z26, Caesar, Rail Fence, mixed-alphabet, ROT13) in C, with an interactive menu for each.

Hill cipher (matrix-based cryptography) in C, with worked encrypt/decrypt examples and step-by-step output.

Enterprise-grade toolkit to audit and migrate legacy infrastructure to hybrid post-quantum cryptography (PQC).

A sponge-based secure hash function that uses AES-256 as its internal PRF.

VanitySearch is a tool designed for finding Bitcoin address prefixes. If you wish to generate a secure private key, please use the -s option to enter your passphrase; this passphrase will be used to generate a base key compliant with the BIP38 standard (e.g., VanitySearch.exe -s "my passphrase" 1MyPrefix). Alternatively, you can use the command VanitySearch.exe -ps "my passphrase", which incorporates an additional cryptographically secure seed into your passphrase. This update addresses bugs related to custom address matching and private key conversion, replaces the random number generator, introduces new search puzzles tailored to specific finite regions, and adds both "random" and "incremental" search modes. Furthermore, the -e option has been added to enable homomorphic properties—a feature that has been completely reimplemented—while the integration of the AVX2 instruction set optimizes CPU performance and enhances underlying logic.

Encryption & compression companion — inspired by Diophantus of Alexandria