Difference between DTLS and TLS

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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

  1. packet retransmission
  2. assigning sequence number within the handshake
  3. replay detection.

See RFC 6347 for details.

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