Explore the advantages and disadvantages of Encrypted Client Hello (ECH), a new RFC designed to encrypt the TLS client hello and conceal sensitive information like the Server Name Indication (SNI). Delve into the intricacies of SNI, client hello, and the encryption process for inner client hello. Examine the client-facing outer SNI, the decryption of inner client hello, and potential drawbacks of implementing ECH. Analyze the balance between censorship prevention and privacy concerns in the context of ECH implementation. Gain insights into this emerging technology and its implications for network security and privacy.

Syllabus

Intro
SNI
Client Hello
Encrypted Client Hello
Inner Client Hello Encryption
Client-Facing Outer SNI
Decrypting Inner Client Hello
Disadvantages
Censorship vs Privacy ECH