CSE 461 Section. “Transport Layer Security” protocol Standard protocol for encrypting Internet traffic Previously known as SSL (Secure Sockets Layer),

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Presentation transcript:

CSE 461 Section

“Transport Layer Security” protocol Standard protocol for encrypting Internet traffic Previously known as SSL (Secure Sockets Layer), which has been around since 1994 TLS replaced SSL in 1999 Used for HTTPS (HTTP Secure) traffic Supported by nearly every web browser

When we don’t use TLS, web traffic goes over unencrypted This includes HTTP payloads, but also HTTP headers Why are headers a problem too?

Data integrity Server (and client) authentication

HTTP CONNECT is used to establish a two-way connection “tunnel” between two parties After this, a “triple handshake” is performed over the tunnel After the handshake, the two parties can communicate securely We’ll take a closer look at this handshake

What do we need to do to communicate securely? Make sure we’re speaking the same language Prove who we are Establish a secret code

Client tells the server its protocol version and what cryptographic algorithms it can use Server responds with a protocol version and cryptographic algorithm to use Server sends its certificate to verify its identity Client verifies certificate and sends Pre-Master Secret, encrypted so only the server can read it Client and server both use that PMS to generate a Master Secret, which is used to generate encryption keys Communication commences

2014 Bug in OpenSSL implementation of TLS Clients ask for a “heartbeat” message to test and keep alive communication links In OpenSSL, length checking wasn’t properly performed on the heartbeat data

How might data be intercepted by a MITM, even when encrypted over TLS? Implementation bugs (e.g., Heartbleed, 3Shake) Server/browser attacks (e.g., truncation attack) “Truncate” logout packet from user User’s browser tells them they’ve logged out They haven’t Side-channel attacks

Some data is leaked even with encryption Packet send timing Payload size AJAX interfaces that load content dynamically provide insight into what the user is typing