Performance Improvements:

Implement radix trie for CIDR-based routing table lookups (O(n) → O(prefix_len))
Optimize traffic statistics hot path using get_mut() fast path
Replace Cursor with direct array indexing in packet parsing
Use heap allocation for MsgBuffer to reduce stack pressure (64KB → 32 bytes on stack)
Security Enhancements:

Increase PBKDF2 iterations from 4,096 to 600,000 (OWASP recommendation)
Add input validation for init messages to prevent DoS attacks (max 64KB field length)
Code Quality:

Add documentation for magic numbers (ROTATE_INTERVAL, NONCE_LEN, MAX_FAILED_RETRIES)
Improve error handling by replacing unwrap() with proper error propagation in GenericCloud::new
Files Modified:

src/table.rs: Implement ClaimTrie for O(prefix_len) lookups
src/traffic.rs: Optimize hot path performance
src/payload.rs: Direct array indexing for faster parsing
src/util.rs: Heap-allocate MsgBuffer buffer
src/crypto/common.rs: Increase PBKDF2 iterations
src/crypto/init.rs: Add input validation and documentation
src/cloud.rs: Improve error handling
src/main.rs: Adapt to new error handling interface
All changes maintain backward compatibility and existing functionality.