[1] [CITE@en[RFC 6520 - Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) Heartbeat Extension]] ([TIME[2015-03-08 14:25:23 +09:00]] 版) <http://tools.ietf.org/html/rfc6520>

[2] [CITE[Transport Layer Security (TLS) Parameters]]
([TIME[2015-02-27 12:03:35 +09:00]] 版)
<http://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#heartbeat-message-types>

[3] [CITE[Transport Layer Security (TLS) Parameters]]
([TIME[2015-02-27 12:03:35 +09:00]] 版)
<http://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#heartbeat-modes>