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Under TLS, when the client wants to connect to the server. The first step is for the Client to send the Server a Client Hello message. The Client Hello A Client Hello message looks like this in WireShark: tls 1.3 wireshark As you can see, it looks a little complicated. We’ll just discuss the most important parts. TLS version In the second line, it says TLSv1.3 Record Layer: Handshake Protocol: Client Hello. However, if we skip down a couple of lines, we see Version: TLS 1.0 (0x0301). You may also notice that just a few lines further down, it says Version: TLS 1.2 (0x0303). The bracketed numbers behind each version are just codes for their respective versions.

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Looking at these conflict numbers. You might be confused about which version of TLS the Client Hello message actually wants to use. The answer lies in the depths of the RFC. The technical documentation Honduras WhatsApp Number List that sets out the TLS 1.3 standard. In section 4.2.1, it discusses the Supported Versions extension (TLS extensions can add additional functionality and capabilities, but they aren’t required). The RFC essentially says that when the Supported Versions extension is present, the server should ignore the other versions mentioned in the Client Hello message, and select a version from the extension instead.

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If we open up the Supported Versions extension in the fifth line from the bottom. We see: tls 1.3 wireshark 1 Here, it shows us that only TLS versions 1.3 and 1.2 are supported. The version that ends up TH Lists being used will depend on what the server supports. Message length Heading back toward the top of the first image, we see Length in both the fifth and eighth lines. The first one says 512, while the second says 508. This is just the size of their respective messages in bytes, and the discrepancy is because the TLS record header itself takes up 4 bytes.

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