Cryptex 1.0.0

Cryptex

A secure command-line tool for encrypting and decrypting files and folders using AES-GCM encryption with PBKDF2 key derivation.

Features

• Strong Encryption: Uses AES-256-GCM authenticated encryption
• Secure Key Derivation: PBKDF2 with 100,000 iterations and SHA-256
• File & Folder Support: Encrypt/decrypt individual files or entire folders
• Authenticated: Prevents tampering with encrypted data
• Simple CLI: Easy-to-use command-line interface

Installation

Install from NuGet

Install as a global .NET tool:

dotnet tool install -g Cryptex

Usage

Encrypt a single file

cryptex encrypt input.txt output.txt.enc

Decrypt a single file

cryptex decrypt input.txt.enc output.txt

Encrypt all files in a folder

cryptex encrypt-folder /path/to/folder

This will create .enc files for all files in the folder (recursively).

Decrypt all encrypted files in a folder

cryptex decrypt-folder /path/to/folder

This will decrypt all .enc files in the folder (recursively).

Security Details

• Algorithm: AES-256-GCM
• Key Derivation: PBKDF2 with 100,000 iterations using SHA-256
• Salt: 16 bytes (randomly generated per file)
• Nonce: 12 bytes (randomly generated per file)
• Tag: 16 bytes (authentication tag)
• AAD: Includes magic bytes, version, salt, and nonce for additional integrity

File Format

Encrypted files use the following structure:

[Magic: "AESGCM10"] [Version: 1] [Salt: 16 bytes] [Nonce: 12 bytes] [Tag: 16 bytes] [Ciphertext: variable]

Development

Requirements

• .NET 9.0 or later

License

MIT