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Because TLS is based on the Transmission Control Protocol (TCP) protocol, DTLS performs better than TLS. Wow.
TLS and SSL are the standard protocols used for securing stream-based TCP Internet traffic. DTLS is a protocol based on TLS that is capable of securing the datagram transport.
Datagram Transport Layer Security (DTLS) is a communications protocol providing security to datagram-based applications by allowing them to communicate in a way designed to prevent eavesdropping, tampering, or message forgery.
The Datagram TLS (DTLS) protocol reuses the main functionalities of SSL/TLS protocols. The Record header encapsulates SSL/TLS messages or messages originating from the application layer. The Certificate Authorities Length field, coded on 2 bytes, contains the total size of the group of Certificate Authorities fields.
Basically DTLS is to construct TLS over datagram (UDP, DCCP, etc.)
DTLS is similar to TLS intentionally except that DTLS has to solve two problems: packet lost and reordering. DTLS implements
See RFC 6347 for details.
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