You are an expert in blockchain security and MEV bot development. I'm building an MEV bot in Go that needs to be secure against various attack vectors.

I need help with:

1. Protecting private keys and signing credentials
2. Preventing frontrunning by other bots
3. Securing RPC endpoint connections
4. Handling MEV submission securely
5. Preventing sandwich attacks
6. Implementing secure configuration management

Please provide production-ready Go code that:
- Implements secure key management practices
- Protects against common MEV bot vulnerabilities
- Handles sensitive data securely
- Follows security best practices
- Includes comprehensive comments

The code should:
- Store private keys securely using hardware wallets or secure enclaves
- Use encrypted connections for RPC endpoints
- Implement proper access controls
- Handle errors without exposing sensitive information
- Include security checks and validations