Crypto Crusader

Background

A new encryption algorithm claims to be quantum-resistant, but security researchers suspect implementation flaws. Your task is to analyze the algorithm and find potential vulnerabilities that could compromise its security.

Objective

Through analysis of the provided implementation:

1. Find the vulnerability in the key generation process
2. Identify the weak encryption mode
3. Exploit the vulnerabilities to decrypt the message

Technical Details

The encryption scheme uses:

• Custom random number generator
• Block cipher in CBC mode
• PKCS7 padding
• Post-quantum primitives

Analysis Areas

1. Key Generation
   • Random number generator implementation
   • Seed generation process
   • Key derivation function
2. Encryption Process
   • Block cipher mode
   • Padding mechanism
   • Error handling
3. Implementation Review
   • Timing analysis
   • Error messages
   • Memory handling

Notes

• Focus on both algorithmic and implementation weaknesses
• Consider side-channel attacks
• Document your exploitation process

Remember to approach the analysis systematically and document each step of your investigation.