Post-quantum cryptography | Ecosyste.ms: Awesome

https://github.com/bcgit/bc-java

Bouncy Castle Java Distribution (Mirror)

crypto dtls java openpgp post-quantum-cryptography tls

Last synced: 09 Apr 2026

https://github.com/open-quantum-safe/liboqs

C library for prototyping and experimenting with quantum-resistant cryptography

cryptography key-exchange-algorithms lattice-based-crypto post-quantum-cryptography

Last synced: 14 May 2025

https://github.com/pq-crystals/kyber

crypto cryptography key-exchange-algorithms lattice-based-crypto module-lattices post-quantum post-quantum-cryptography

Last synced: 04 Jan 2026

https://github.com/pqclean/pqclean

Clean, portable, tested implementations of post-quantum cryptography

c cryptography implementations post-quantum post-quantum-cryptography pqc pqcrypto

Last synced: 15 May 2025

https://github.com/PQClean/PQClean

Clean, portable, tested implementations of post-quantum cryptography

c cryptography implementations post-quantum post-quantum-cryptography pqc pqcrypto

Last synced: 11 Apr 2025

https://github.com/rustpq/pqcrypto

Rust Post-Quantum cryptography

crypto-library cryptography post-quantum post-quantum-cryptography pqc pqcrypto rust

Last synced: 11 Apr 2025

https://github.com/veil-net/conflux

Connector for decentralised post-quantum secure network - VeilNet

overlay-network post-quantum-cryptography vpn

Last synced: 01 Apr 2026

https://github.com/slothy-optimizer/slothy

Assembly super-optimization via constraint solving

assembly-language constraint-programming cryptography-tools post-quantum-cryptography superoptimization

Last synced: 16 Jan 2026

https://github.com/paulmillr/noble-post-quantum

Auditable & minimal JS implementation of public-key post-quantum cryptography

dilithium falcon fips-203 fips-204 fips-205 fips-206 fips203 fips204 fips205 fips206 kyber ml-dsa ml-kem post-quantum-cryptography slh-dsa sphincs sphincs-plus winternitz

Last synced: 16 May 2025

https://github.com/open-quantum-safe/liboqs-python

Python 3 bindings for liboqs

cryptography post-quantum-cryptography python python3 quantum-computing

Last synced: 08 Oct 2025

https://github.com/quininer/sarkara

[unmaintenance] A experimental post-quantum cryptography library

experimental-library key-exchange-algorithms online-authenticated-encryption post-quantum-cryptography rust signature

Last synced: 07 Apr 2025

https://github.com/leanethereum/leanspec

Lean Ethereum protocol specifications and test vector generation framework.

eth ethereum ethereum-testing lean-ethereum post-quantum-cryptography

Last synced: 31 May 2026

https://github.com/open-quantum-safe/liboqs-go

Go bindings for liboqs

cryptography go golang post-quantum-cryptography quantum-computing

Last synced: 03 Jul 2025

https://github.com/itzmeanjan/ml-kem

Module-Lattice-based Key Encapsulation Mechanism Standard by NIST i.e. FIPS 203

constexpr constexpr-all-the-things kem key-encapsulation-mechanism kyber ml-kem ml-kem-1024 ml-kem-512 ml-kem-768 nist-pqc post-quantum-cryptography pqc

Last synced: 06 Apr 2025

https://github.com/nethermindeth/latticefold

A lattice-based non-interactive folding scheme written in Rust

blockchain ethereum lattice-based-crypto post-quantum-cryptography rust verifiable-computation zero-knowledge zk-snarks

Last synced: 07 May 2025

https://github.com/backbone-hq/pqcrypto

👻 Post-quantum cryptography for Python.

cryptography key-exchange post-quantum-cryptography public-key-cryptography python signature-scheme

Last synced: 07 May 2025

https://github.com/tniessen/node-pqclean

PQClean for Node.js, Deno, and browsers 🔏🔑 Node.js native addon and WebAssembly implementation

cryptography deno javascript nodejs npm-package post-quantum post-quantum-cryptography post-quantum-kem post-quantum-signature webassembly

Last synced: 30 Jun 2025

https://github.com/open-quantum-safe/liboqs-java

liboqs-java is an open source Java wrapper for the liboqs C library. The Open Quantum Safe (OQS) project provides software for prototyping quantum-resistant cryptography.

cryptography digital-signature java key-encapsulation liboqs post-quantum-cryptography quantum-computing

Last synced: 18 Jun 2025

https://github.com/cbomkit/sonar-cryptography

This repository contains a SonarQube Plugin that detects cryptographic assets in source code and generates CBOM.

cbom cbom-tool cbomkit crypto-scanner cryptographic-inventory cryptography cryptography-bom post-quantum post-quantum-cryptography quantum-safe sbom sbom-tool sonar sonarqube

Last synced: 04 Feb 2026

https://github.com/open-quantum-safe/liboqs-cpp

C++ bindings for liboqs

c-plus-plus cpp cpp11 cryptography post-quantum-cryptography quantum-computing

Last synced: 03 Jul 2025

https://github.com/itzmeanjan/ml-dsa

Module-Lattice-based Digital Signature Standard Standard by NIST i.e. FIPS 204

crystals-dilithium digital-signatures dilithium fips-204 ml-dsa post-quantum-cryptography

Last synced: 15 Apr 2025

https://github.com/virgilsecurity/virgil-crypto-c

This library is designed to be small, flexible and convenient wrapper for a variety crypto algorithms. So it can be used in a small micro controller as well as in a high load server application.

crypto crypto-algorithms falcon phe post-quantum-cryptography pythia round5 virgil-crypto

Last synced: 22 Apr 2026

https://github.com/amagioss/slv

Securely store, share, and access secrets alongside the codebase.

post-quantum-cryptography secret-management secret-manager secrets secrets-management secrets-manager secure-local-vault slv

Last synced: 05 Oct 2025

https://github.com/terra-quantum-public/tq42-pqc-oss

TQ42 Cryptography is a comprehensive suite of quantum-resistant and asymmetric post-quantum encryption algorithms and key management functions offered under the open source AGPLv3 license and available under a Commercial license from Terra Quantum.

aes api c c-plus-plus cryptographic-agility cryptographic-hash-functions cryptography falcon hdd kem post-quantum post-quantum-cryptography pqc pqcrypto random-number-generators secrets-management ssd

Last synced: 12 Sep 2025

https://github.com/sebastienrousseau/kyberlib

A Robust Rust Library for CRYSTALS-Kyber Post-Quantum Cryptography 🦀

cryptography cryptography-algorithms cryptography-library crystals-kyber kyber kyberlib no-std post-quantum post-quantum-cryptography post-quantum-kem quantum-cryptography

Last synced: 09 Apr 2025

https://github.com/cbomkit/cbomkit-theia

A tool for detecting cryptographic assets in container images and directories, and generating CBOMs.

cbom cbom-tool cbomkit cryptography cryptography-bom docker filesystem go golang post-quantum-cryptography quantum-safe sbom

Last synced: 13 May 2026

https://github.com/virgilsecurity/virgil-crypto-x

Virgil Crypto stack Objective-C/Swift

crypto cryptography double-ratchet encryption post-quantum-cryptography virgil

Last synced: 09 May 2025

https://github.com/VirgilSecurity/virgil-crypto-x

Virgil Crypto stack Objective-C/Swift

crypto cryptography double-ratchet encryption post-quantum-cryptography virgil

Last synced: 02 Aug 2025

https://github.com/liesware/coherence

Coherence is cryptographic server for modern web apps

aes cipher crytography digital-signature ecc hash hmac json ntru post-quantum-cryptography public-key-cryptography qtesla rsa sha3 tcp-server

Last synced: 15 Nov 2025

https://github.com/pqca/cbomkit

A toolset for dealing with Cryptography Bill of Materials (CBOM)

cbom cbom-tool cbomkit crypto-scanner cryptographic-inventory cryptography cryptography-bom post-quantum post-quantum-cryptography quantum-safe sbom sbom-tool

Last synced: 25 Jun 2025

https://github.com/dashlane/pqc.js

JS bindings and playground of post-quantum asymmetric ciphers

asymmetric-cryptography ciphers javascript nodejs post-quantum-cryptography webassembly

Last synced: 20 Aug 2025

https://github.com/itzmeanjan/falcon

Falcon: Fast-Fourier Lattice-based Compact Signatures over NTRU - NIST PQC Digital Signature Algorithm

digital-signature-algorithm falcon falcon1024 falcon512 lattice-based-crypto nist nist-pqc ntru post-quantum-cryptography

Last synced: 06 May 2025

https://github.com/defeo/mathematicsofibc

Lecture notes on the Foundations of Isogeny-based Cryptography

cryptography elliptic-curves isogeny isogeny-based lecture-notes post-quantum-cryptography

Last synced: 27 Feb 2026

https://github.com/gravity-postquantum/prune-horst

Signature scheme submitted to NIST's Post-Quantum Cryptography Project

cyber hash-functions merkle-tree post-quantum-cryptography quantum signature

Last synced: 18 Nov 2025

https://github.com/embetrix/meta-oqs

OpenEmbedded/Yocto layer dedicated to Post-Quantum Cryptography providing experimental integration of quantum-safe algorithms to embedded linux

crypto-agility cryptography embedded-linux embedded-systems open-quantum-safe openembedded oqs post-quantum-cryptography pqcrypto security yocto

Last synced: 02 Apr 2026

https://github.com/atropinetears/selenite

An Experimental Rust Crate for Post-Quantum Code-Signing Certificates.

certificate crate crypto cryptography digital-signature falcon library post-quantum post-quantum-cryptography pqcrypto rust rust-lang sphincs

Last synced: 09 Apr 2025

https://github.com/snawoot/pyknock

UDP port knocking suite with HMAC-PSK authentication.

firewall-management network networking port-knock port-knocker post-quantum post-quantum-cryptography security security-hardening stealth

Last synced: 24 Aug 2025

https://github.com/pkic/pqccm

PQC Capabilities Matrix (PQCCM)

capabilities crypto matrix post-quantum post-quantum-cryptography pq pqc quantum-safe-cryptography

Last synced: 25 Jan 2026

https://github.com/aditisrinivas97/Crypto-Vinaigrette

Quantum-resistent asymmetric key generation tool for digital signatures.

cryptography digital-signature key-generation post-quantum-cryptography python rainbow-scheme security-tools uov

Last synced: 15 Nov 2025

https://github.com/future-ai-org/quantum-computing-toolkit

👾 notes and resources on quantum computing (e.g., quantum information, post-quantum cryptography, implications on post-quantum and blockchains)

blockchain-technology documents post-quantum-cryptography quantum quantum-algorithms quantum-computing quantum-information quantum-machine-learning quantum-mechanics resources

Last synced: 30 Apr 2026

https://github.com/10d9e/quantum-bitcoin

Post-quantum signatures (Dilithium) in Bitcoin

bitcoin post-quantum-cryptography

Last synced: 13 Jul 2025

https://github.com/nethermindeth/condor-rs

Falcon (https://falcon-sign.info/) signature aggregation with LaBRADOR in Rust

cryptography post-quantum-cryptography rust signatures zk

Last synced: 07 May 2025

https://github.com/lentus/wotsp

An implementation of the Winternitz OTS (W-OTS+) in Go

golang post-quantum-cryptography signature-scheme wots wots-plus

Last synced: 14 Jan 2026

https://github.com/thales-e-security/goliboqs

Go wrapper for liboqs; allows Go applications to use quantum-resistant KEMs

go post-quantum-cryptography quantum-computing

Last synced: 10 Feb 2026

https://github.com/virgilsecurity/virgil-e3kit-x

E3Kit is a security framework that simplifies work with Virgil services and presents the easiest way to add full end-to-end security to your chat application to become HIPAA and GDPR compliant and more.

e3kit encryption end-to-end-encryption gdpr group-encryption hipaa multi-device pki post-quantum-cryptography pqc sdk secure-the-future securethefuture stream-encryption swift

Last synced: 09 May 2025

https://github.com/fraunhofer-aisec/pqdb

A comprehensive list of post-quantum crypto schemes and their properties

post-quantum-cryptography

Last synced: 27 Jul 2025

https://github.com/virgilsecurity/virgil-e3kit-kotlin

E3Kit is a security framework that simplifies work with Virgil services and presents the easiest way to add full end-to-end security to your chat application to become HIPAA and GDPR compliant and more.

e3kit encryption encryption-for-unregistered-users end-to-end-encryption gdpr group-encryption hipaa java kotlin multi-device pki post-quantum-cryptography pqc sdk secure-the-future stream-encryption

Last synced: 09 May 2025

https://github.com/tniessen/node-mceliece-nist

Node.js bindings for the reference implementation of the Classic McEliece KEM.

crypto mceliece nodejs post-quantum-cryptography pqc webassembly

Last synced: 07 Oct 2025

https://github.com/cbomkit/cbomkit-action

GitHub Action to generate Cryptography Bill of Materials (CBOM)

cbom cbom-tool cbomkit cryptographic-inventory github-actions post-quantum-cryptography quantum-safe

Last synced: 04 Feb 2026

https://github.com/shibme/xipher

Xipher is a curated collection of cryptographic primitives put together to perform key/password based asymmetric encryption

crypto cryptography encryption-tool end-to-end-encryption password-based-encryption post-quantum-cryptography web-application xipher

Last synced: 12 Apr 2025

https://github.com/cryptopp-modern/cryptopp-modern

A maintained, modernised fork of Crypto++ with new algorithms and security improvements

argon2 blake3 cpp crypto cryptography cryptopp cryptopp-modern encryption-library post-quantum-cryptography pqc

Last synced: 17 May 2026

https://github.com/vesvault/libVES

VESvault End-to-End Encryption API: Encrypt Everything Without Fear of Losing the Key

browser-based crypto-api ecdh ecdhe elliptic-curve-cryptography encryption encryption-api encryption-decryption js-cryptography pin post-quantum-cryptography postquantum postquantumcryptography rsa rsa-encryption shamir shamir-s-secret-sharing-scheme shamir-secret-sharing webcrypto webcrypto-api

Last synced: 15 Nov 2025

https://github.com/itzmeanjan/sphincs-plus

SPHINCS+: Stateless Hash-based Digital Signature Algorithm

digital-signature nist nist-pqc post-quantum-cryptography pqc shake shake256 sphincs sphincs-plus sphincs-shake

Last synced: 12 May 2025

https://github.com/nikhilrout/ntt-fpga

Verilog Implementation of the Number Theoretic Transform (NTT) and its inverse operation (INTT) utilizing modulo arithmetic for lattice-based PQC on FPGAs

fpga homomorphic-encryption lattice-based-crypto number-theoretic-transform post-quantum-cryptography

Last synced: 24 Jan 2026

https://github.com/virgilsecurity/virgil-sdk-go

Virgil Core SDK allows developers to get up and running with Virgil Cards Service API quickly and add end-to-end security to their new or existing digital solutions to become HIPAA and GDPR compliant and more.

cryptography encryption falcon pki post-quantum-cryptography round5 sdk virgil-cards virgil-keys

Last synced: 09 May 2025

https://github.com/harryr/pypqc

Python Wrappers for Post-Quantum Cryptography, see: https://csrc.nist.gov/Projects/Post-Quantum-Cryptography/Round-1-Submissions

cli cryptography nist post-quantum post-quantum-cryptography python

Last synced: 09 Oct 2025

https://github.com/soqucoin/soqucoin

Soqucoin-SOQ: very quantum. much resistance.

binius cryptocurrency dilithium dogecoin-fork merkel post-quantum-cryptography sangria scrypt-algorithm

Last synced: 31 May 2026

https://github.com/erich-9/NistyPQC.jl

Post-Quantum Cryptography for Julia

bike classic-mceliece cryptography dilithium falcon julia kyber post-quantum-cryptography

Last synced: 06 Apr 2026

https://github.com/pmuens/haven

Fast and ergonomic lattice cryptography library

homomorphic-cryptography-scheme homomorphic-encryption homomorphic-encryption-library lattice lattice-based-crypto learning-with-errors lwe post-quantum post-quantum-cryptography

Last synced: 24 Apr 2025

https://github.com/cepdnaclk/e16-4yp-post-quantum-cryptographic-schemes-based-on-plain-lattices

This project proposes the use of plain lattices with learning with errors problem to implement a cryptographic scheme which can run on classical computers and provides security against quantum based attacks. We are proposing key sizes for efficient operations and implement a lattice trapdoor function. Also we will improve current random oracle based model in to a standard model.

cryptography lattice-based-crypto learning-with-errors post-quantum-cryptography public-key-cryptography random-oracle-model

Last synced: 01 May 2025

https://github.com/piotrcki/crypt0

One-time pad on steroids

cryptography one-time-pad post-quantum-cryptography

Last synced: 14 Jan 2026

https://github.com/atropinetears/winternitz-ots

A Rust Library For The Post-Quantum Digital Signature Scheme Winternitz One-Time Signature using the hash function Blake2b.

blake2b crypto cryptography digital-signature hash hashing one-time-signatures ots post-quantum post-quantum-cryptography rust rust-crate rust-lang rust-library security signatures winternitz winternitz-ots wots

Last synced: 27 Mar 2026

https://github.com/aldrinmathew/kyber.dart

Kyber Post-Quantum key exchange protocol for Dart

kyber post-quantum post-quantum-cryptography

Last synced: 23 Oct 2025

https://github.com/issdandavis/scbe-aethermoore

Geometric AI governance and evaluation framework with a 14-layer security pipeline, semantic projection, and reproducible benchmark lanes.

adversarial-ml ai-alignment ai-firewall ai-governance ai-red-team ai-safety autonomous-agents cryptography geometric-security hyperbolic-geometry llm-security machine-learning multi-agent-systems patent-pending poincare-ball post-quantum-cryptography prompt-injection runtime-governance sacred-tongues security-framework

Last synced: 15 May 2026

https://github.com/sz3/libmcleece

Command line tool for Classic McEliece cryptography

cpp17 mceliece post-quantum-cryptography

Last synced: 15 May 2025

https://github.com/atropinetears/lamport-rs

A Post-Quantum Cryptographic Library For Lamport Signatures

crate crates cryptography cryptography-library digital-signature lamport lamport-algorithm lamport-signature lamport-signature-scheme leslie-lamport post-quantum post-quantum-cryptography rust rust-lang

Last synced: 10 Apr 2025

https://github.com/defeo/postscryptum

SageMath notebooks for Isogeny Graphs in Cryptography

cryptography elliptic-curves isogenies post-quantum post-quantum-cryptography sagemath sidh

Last synced: 13 Mar 2026

https://github.com/AtropineTears/Lamport-rs

A Post-Quantum Cryptographic Library For Lamport Signatures

crate crates cryptography cryptography-library digital-signature lamport lamport-algorithm lamport-signature lamport-signature-scheme leslie-lamport post-quantum post-quantum-cryptography rust rust-lang

Last synced: 13 May 2025

https://github.com/itzmeanjan/frodokem

FrodoKEM: Practical Quantum-secure Key Encapsulation from Generic Lattices

frodo frodokem kem key-encapsulation-mechanism learning-with-errors nist-pqc post-quantum-cryptography

Last synced: 15 Mar 2025

https://github.com/azomdev/privacypin

Secure self-hosted FOSS location sharing app that prioritizes user privacy and security

end-to-end-encryption location-sharing post-quantum-cryptography privacy self-hosted

Last synced: 24 Oct 2025

https://github.com/sphinx-core/go

SPHINX go is contain package files of the protocol source-code

blockchain blockchain-technology open-source open-source-project post-quantum-cryptography

Last synced: 11 Jan 2026

https://github.com/jiep/generic-anon-ake

Implementation of Generic Anonymous AKE

ake cryptography dilithium kyber liboqs post-quantum post-quantum-cryptography post-quantum-kem rust signature

Last synced: 09 May 2025

https://github.com/SPHINX-HUB-ORG/PQCFramework

SPHINX Blockchain Framework

blockchain blockchain-technology collaboration collaboration-community community open-source opensource post-quantum-cryptography quantum-algorithms quantum-computing startup

Last synced: 25 Mar 2025

https://github.com/ixian-platform/quixi

Quick integration toolkit for Ixian. Connects apps, IoT devices, and services to the Ixian Platform via REST APIs and message queues (MQTT/RabbitMQ). Provides developers with a simple bridge into secure Ixian communication.

api encryption integration iot message-queue messaging mqtt p2p post-quantum post-quantum-cryptography rabbitmq

Last synced: 14 Sep 2025

https://github.com/thalesgroup/luna-openssl-provider

An OpenSSL provider giving access to various cryptographic algorithms running on a Luna Network appliance, including post-quantum ones.

cryptographic-tools hsm liboqs luna openssl post-quantum-cryptography pqc thales

Last synced: 17 Mar 2025

https://github.com/xscriptorcode/xkyber_crypto

xKyberCrypto post-quantum encryption solutions in flutter based on the Kyber algorithm.

crypto cryptography cryptography-algorithms dart-package flutter-crypto kyber kyber-algorithm library post-quantum-cryptography public-key-encryption security xkyber

Last synced: 11 Apr 2025

https://github.com/duskyelf/elfmsg

Open, end-to-end encrypted messenger app

end-to-end-encryption messenger post-quantum-cryptography post-quantum-encryption web-application

Last synced: 23 Jun 2025

https://github.com/siemens/cmp-test-suite

Automated test suite to evaluate server-side implementations of Certificate Management Protocol (CMP)

asn1 certificate-authority pki post-quantum-cryptography pqc rfc4210 rfc9483 x509

Last synced: 20 Jul 2025

https://github.com/0xnu/qrme

qrme is a quantum-resistant encrypted machine learning system designed to protect sensitive data and models against potential threats from quantum computing.

cryptography large-language-model large-language-models llm llms post-quantum-cryptography

Last synced: 25 Jan 2026

https://github.com/allianzatech/blockchainallianza

Quantum-safe, bridge-free cross-chain interoperability platform using NIST PQC standards and Zero-Knowledge Proofs.

bitcoin blockchain bridge-free cross-chain cybersecurity decentralized-finance ethereum fintech interoperability nist-pqc nobridge polygon post-quantum-cryptography pqc quantum-safe smart-contracts solana web3 zero-knowledge-proofs zk-proofs

Last synced: 13 Jan 2026

https://github.com/itzmeanjan/saber

Saber: Post-Quantum Key Encapsulation Mechanism

kem key-encapsulation-mechanism learing-with-rounding mlwr pke post-quantum-cryptography public-key-encryption saber

Last synced: 01 Apr 2025

https://github.com/kiooku/cryptography-notebook

Cryptography Notebook is a repository containing some of the cryptographic implementations I have done for learning purposes.

assymetric-encryption commitment-schemes cryptography digital-signature double-ratchet-algorithm e2ee ggh hkdf hmac identification-scheme one-time-pad post-quantum-cryptography public-key-cryptography rsa signal x3dh zero-knowledge-proof

Last synced: 23 Apr 2025

https://github.com/galihru/pqcrypto

LAI is a promising post-quantum cryptosystem based on isogenies of elliptic curves over lemniscate lattices, offering resistance against quantum-capable adversaries.

cybersecurity isogenies lemniscate post-quantum-cryptography

Last synced: 06 Feb 2026

https://github.com/jiep/pq-gake-fsxy

Post-Quantum Group Authenticated Key Exchange protocol with the LibOQS library

classic-mceliece gake kyber liboqs ntru post-quantum-algorithms post-quantum-cryptography post-quantum-kem saber

Last synced: 20 Apr 2025

https://github.com/davidbuchanan314/ml-kem-stuff

A toy implementation of ML-KEM, aka Kyber, based on the current FIPS 203 draft

cryptography cryptography-algorithms key-encapsulation-mechanism kyber ml-kem post-quantum-cryptography pqc python

Last synced: 10 Nov 2025

https://github.com/sweatpotato13/newhope-ts

Npm module implementation of newhope algorithm

npm post-quantum-cryptography

Last synced: 17 May 2026

https://github.com/embetrix/meta-pqc

OpenEmbedded/Yocto layer dedicated to Post-Quantum Cryptography, providing integration and testing of quantum-safe cryptographic algorithms for embedded linux systems.

crypto-agility cryptography embedded-linux embedded-systems openembedded post-quantum-cryptography python security yocto

Last synced: 24 Feb 2025

https://github.com/chiefbiiko/falcon-cli

post-quantum file sigs

cli digital-signatures post-quantum-cryptography

Last synced: 14 Mar 2025

https://github.com/transmute-industries/dilithium-key-pair

Dilithium is a digital signature scheme that is strongly secure under chosen message attacks based on the hardness of lattice problems over module lattices.

cose jose post-quantum-cryptography

Last synced: 14 Mar 2026

https://github.com/systemslibrarian/meow-decoder

Secure Optical Air-Gap File Transfer via QR-Code GIFs Hiss secrets into yarn balls 😼 — cat-meme QR GIFs built for camera loss (fountain codes) and fail-closed crypto.

aead aes-gcm air-gap argon2id forward-secrecy fountain-codes hkdf ml-kem plausible-deniability post-quantum-cryptography steganography x25519