CryptX - File Encryption Utility

CryptX is a terminal-based file encryption and decryption tool written in Python. It uses AES encryption with password-derived keys to secure individual files or entire directories. Every encrypted file is tagged with a unique identifier and checked against integrity using HMAC.

Requirements

• Python 3.6+
• Dependencies:
  • cryptography>=3.4.0

Core Functions

File Operations

• Single file encryption/decryption
• Batch directory processing
• Automatic operation detection based on file signatures

Command Reference

Command	Function
[filepath]	Process file/directory
exit	Terminate application
cls	Clear terminal

Security Implementation

Cryptographic Components

Component	Implementation
Key Derivation	PBKDF2-HMAC-SHA256
Encryption Algorithm	AES-256-CFB
Data Integrity	HMAC Authentication
Secure Erasure	Multi-pass random overwrite

Security Parameters

• Iteration Count: 100,000
• Salt Size: 16 bytes
• Key Size: 32 bytes
• IV Size: 16 bytes

Technical Details

• Algorithm: AES in CFB mode
• Key Generation: PBKDF2-SHA256 with 100,000 iterations
• Random Elements: 16-byte salt and IV per file
• File Identification: 6-character alphanumeric tag in filename
• Data Protection: HMAC-SHA256 for integrity verification
• File Format: [seed][salt][iv][encrypted_data][hmac]
• Secure Cleanup: Original files overwritten with random data