Overview

A command-line communication software focused on human rights, utilizing advanced algorithms to protect your privacy and security. It’s the international version of Chraypt, with integrated Tor support. See https://github.com/nitsc/chraypt for China special edition, Chraypt.

Development Objectives

Overview

We firmly believe that everyone has their own human rights.

Program Dev

• Developers must adhere to the principles of human rights
• Prohibit the collection of all information about Chrayptor users.
• Adhere to Chrayptor's P2P, E2E, decentralized, and Tor features.
• Adhere to the security and privacy of Chrayptor.
• Adhere to the principles of high open source and free modification of source code.

Objective Standard

Languages

• Rust: After Python prototyping, rewrite Chrayptor in Rust.
• Python: may retain some Python parts.
• Go: possibly use Chrayptor for key parts of network concurrency.

Algorithms

Symmetric encryption: used to encrypt large amounts of data, fast speeds

• AES (Advanced Encryption Standard): widely used in communication protocols (e.g., TLS) (implemented)
• ChaCha20: a stream cipher, often used in conjunction with Poly1305 message authentication codes to provide efficient and secure encryption and authentication
• SM4: a commercial cryptographic algorithm released by the State Cryptography Administration of China (SCCA) and widely used in the financial and government sectors in China (Implemented)

Asymmetric encryption

• ECC (Elliptic Curve Cryptography): more efficient than RSA, suitable for mobile devices (Implemented)
• SM2: an elliptic curve public key cryptography algorithm standard published by the State Cryptography Administration of China (SCCA) (canceled, because it is not widely used and documented at present)
• NTRU (Nth Degree Truncated Polynomial Ring Units): a Lattice-based public key cryptography algorithm.
• Lattice-based Cryptography: Lattice-based Cryptography
• Code-based Cryptography: is a post-quantum cryptography approach that uses the difficulties of error-correcting code theory to construct cryptosystems

Key exchange algorithms

• Diffie-Hellman (DH): used to securely generate shared keys (canceled because of the high efficiency of the key ECDH and the low quantum security)
• ECDH (Elliptic Curve Diffie-Hellman): based on elliptic curves, more efficient (implemented)
• Kyber: is a lattice-based key exchange protocol that is a candidate for the NIST Post-Quantum Cryptography Standardization Project
• Curve25519: is an elliptic curve for efficient and secure cryptographic protocols, especially in the implementation of public-key cryptography and key exchange protocols (Implemented)
• CSIDH (Commutative Supersingular Isogeny Diffie-Hellman) is a post-quantum key exchange protocol based on the homology of supersingular elliptic curves (canceled, since there is currently no mature CSIDH library)

Digital signature algorithms

• ECDSA (Elliptic Curve Digital Signature Algorithm): is a widely used digital signature algorithm based on elliptic curve cryptography (ECC)
• SM2: based on the elliptic curve discrete logarithm puzzle
• EdDSA (Edwards-curve Digital Signature Algorithm): digital signature algorithm based on Edwards curves (implemented)

Hash Algorithm

• SHA3-512, SHA2-512,: high security, widely used for data integrity verification, signature verification (Implemented)
• Argon2: specifically designed to resist brute-force attacks on hardware acceleration such as GPUs and ASICs (Implemented)
• BLAKE3: very modern and high performance (Implemented)
• SM3: standard for cryptographic hashing algorithms published by the Chinese State Cryptography Bureau (canceled, as it is not widely used and documented at the moment)

Random number generation algorithm

• CSPRNG (Cryptographically Secure Pseudo-Random Number Generator) (realized)

Communication protocols

• TLS: (Transport Layer Security): implements encrypted transport, authentication (implemented, but client-side authentication is temporarily disabled because SSL does not trust self-signed certificates)
• Noise Protocol Framework (Transport Layer Security)： for modern communication software
• Tor: access to the Tor network (Implemented)
• I2P: Access to I2P networks.

Zero Knowledge Proofs

• zk-SNARKs, zk-STARKs

Using Instructions

Install and set Tor

Ubuntu based Linux

sudo apt update
sudo apt install tor

Windows

• Download and Install Tor Expert Bundle.
• Findout the tor.exe, donnot run it.

Set up the Tor HiddenService

Find torrc out

• Linux: /etc/tor/torrc
• Windows: C:\Users<YourUserName>\AppData\Roaming\tor\torrc If ther isn't any torrc here, try to build file 'torrc'

Edit torrc

Write this to torrc:

HiddenServiceDir "path\\to\\your\\tor-expert-bundle-windows-x86_64-14.0.4\\tor\\hidden_service\\"
HiddenServicePort 80 127.0.0.1:52000
ControlPort 9051
CookieAuthentication 1
SocksPort 9050

Restart Tor

Linux

sudo systemctl restart tor

Windows

Stop and Restart tor.exe

Find Host Address

Linux

/path/to/hidden/service/directory/hostname

Windows

path/to/hidden/service/directory/hostname

Test

Run torserver.py and cilent.py, enter the hostname(.onion). Then you can connect to server. Talk in safety and privacy!