How Researchers Reverse‑Engineered ASP.NET ViewState Encryption

A recent blog post details the process of decoding ASP.NET ViewState data. The author explains how ViewState messages are encrypted and serialized. By reproducing the decryption steps, the guide reveals hidden form values. The technique uses publicly available cryptographic libraries. It demonstrates potential security weaknesses in improperly configured apps. The post includes sample code for extracting and interpreting the payload. Readers are advised to apply proper ViewState protection in production. The article serves as a reference for developers auditing legacy .NET sites.