This is a list of all of the encryption algorithms that the browser is willing to support. If we had previously connected to a few seconds ago, we could potentially resume a session and avoid a full handshake. There are four bytes representing the current Coordinated Universal Time ( UTC) in the Unix epoch format, which is the number of seconds since January 1, 1970. The first is our "Client Hello" message (0x01). The handshake record is broken out into several messages. The next two bytes are 0x0301 which indicate that this is a version 3.1 record which shows that TLS 1.0 is essentially SSL 3.1. We see that the first byte out of our browser is the hex byte 0x16 = 22 which means that this is a "handshake" record: TLS wraps all traffic in "records" of different types. It's rare to see true "SSL" traffic given that TLS has been around for 10 years. The first post-Netscape version was re-branded as Transport Layer Security ( TLS) 1.0 which was released in January 1999. As Netscape lost market share, SSL's maintenance moved to the Internet Engineering Task Force ( IETF). Most people associate HTTPS with SSL (Secure Sockets Layer) which was created by Netscape in the mid 90's. With the help of Wireshark, my favorite network tool, and a slightly modified debug build of Firefox, we can see exactly what's going on.īy agreement of RFC 2818, Firefox knew that "https" meant it should connect to port 443 at : In the 220 milliseconds that flew by, a lot of interesting stuff happened to make Firefox change the address bar color and put a lock in the lower right corner. Convinced from spending hours reading rave reviews, Bob eagerly clicked "Proceed to Checkout" for his gallon of Tuscan Whole Milk and.
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