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Vyncke comments. Fixes #225 #240

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Vyncke comments. Fixes #225 #240

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11 changes: 6 additions & 5 deletions draft-ietf-tls-dtls13.md
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Expand Up @@ -197,17 +197,18 @@ protection of a WebRTC data channel), telephony utilizes DTLS for
key establishment, and Secure Real-time Transport Protocol (SRTP) for
protection of data {{?RFC5763}}.

TLS cannot be used directly in datagram environments for the following five reasons:
TLS cannot be used directly over datagram transports the following five reasons:

1. TLS relies on an implicit sequence number on records. If a record is not
received, then the recipient will use the wrong sequence number when
attempting to remove record protection from subsequent records. DTLS solves
this problem by adding sequence numbers to records.

2. The TLS handshake is a lock-step cryptographic protocol. Messages must be
transmitted and received in a defined order; any other order is an error.
The DTLS handshake includes message sequence numbers to enable
reassembly in the correct order in case datagrams are lost or reordered.
2. The TLS handshake is a lock-step cryptographic protocol. Messages
must be transmitted and received in a defined order; any other
order is an error. The DTLS handshake includes message sequence
numbers to enable fragmented message reassembly and in-order
delivery in case datagrams are lost or reordered.

3. During the handshake, messages are implicitly acknowledged by other handshake
messages. Some handshake messages, such as the NewSessionTicket message, do
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