Explore the intricacies of embedding robust backdoors in secret symmetric ciphers in this 50-minute Black Hat USA 2005 conference talk by Adam L. Young. Delve into various types of backdoors, examining historical cases like the Anderson Report, Data Encryption Standard (DES), and Digital Signature Standard (DSS). Learn about approaches to casting doubt, backdoor implementation in public and secret block ciphers, and master key cryptosystems. The talk covers deterministic asymmetric encryption, introducing the Monkey Cipher and Black-Rugose Cipher, discussing their overview and security implications. Gain valuable insights into the complex world of cryptographic backdoors and their potential impact on secure communication systems.