DeepSea Obfuscator functions by transforming MSIL (Microsoft Intermediate Language) into a format that is technically valid for the Common Language Runtime (CLR) but practically unreadable for humans. Its v4 release introduced several robust protection layers:
Use tools like Detect It Easy (DIE) or ProtectionID . DeepSea typically leaves distinct signatures in the metadata.
Learning how .NET assemblies function at a low level.