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Science/Tech
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Title: Good-bye ESNI, hello ECH!
Source: [None]
URL Source: https://blog.cloudflare.com/encrypted-client-hello/
Published: Oct 27, 2023
Author: Staff
Post Date: 2023-10-27 21:10:51 by Horse
Keywords: None
Views: 98

In this post we'll dive into Encrypted Client Hello (ECH), a new extension for TLS that promises to significantly enhance the privacy of this critical Internet protocol. Today, a number of privacy-sensitive parameters of the TLS connection are negotiated in the clear. This leaves a trove of metadata available to network observers, including the endpoints' identities, how they use the connection, and so on.

ECH encrypts the full handshake so that this metadata is kept secret. Crucially, this closes a long-standing privacy leak by protecting the Server Name Indication (SNI) from eavesdroppers on the network. Encrypting the SNI is important because it is the clearest signal of which server a given client is communicating with. However, and perhaps more significantly, ECH also lays the groundwork for adding future security features and performance enhancements to TLS while minimizing their impact on the privacy of end users.

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