Alice -> Bob: Authentication request
Bob --> Alice: Response

participant Participant [
    =Title
    ----
    ""SubTitle""
]

----------------------------------------------------

[
	"Alice ",
	["arrow", ["->"]],
	" Bob",
	["punctuation", ":"],
	" Authentication request\r\nBob ",
	["arrow", ["-->"]],
	" Alice",
	["punctuation", ":"],
	" Response\r\n\r\n",

	["keyword", "participant"],
	" Participant ",
	["punctuation", "["],

	["text", "    =Title\r\n    ----\r\n    \"\"SubTitle\"\"\r\n"],
	["punctuation", "]"]
]
