Talk:Hash Based Authentication - Revision history

Meriton at 22:40, 7 March 2006

2006-03-07T22:40:47Z

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	A trap door one-way function is a function that can only be inverted if some secret value (the trap door) is known (admittedly, the naming convention sucks, since a trap-door one-way function is not a one-way function), see also http://en.wikipedia.org/wiki/Trapdoor_one_way_function)		A trap door one-way function is a function that can only be inverted if some secret value (the trap door) is known (admittedly, the naming convention sucks, since a trap-door one-way function is not a one-way function), see also http://en.wikipedia.org/wiki/Trapdoor_one_way_function)

			I didn't include the requirement because even though it is necessary, it is - I think - not sufficient for security.

	[[User:Meriton\|Meriton]] 16:39, 7 March 2006 (CST)		[[User:Meriton\|Meriton]] 16:39, 7 March 2006 (CST)

2006-03-07T22:39:19Z

← Older revision		Revision as of 18:39, 7 March 2006
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	[[User:Z-man\|Z-Man]] 16:18, 7 March 2006 (CST)		[[User:Z-man\|Z-Man]] 16:18, 7 March 2006 (CST)

			What you are describing is a one-way function, see http://en.wikipedia.org/wiki/One-way_function

			A trap door one-way function is a function that can only be inverted if some secret value (the trap door) is known (admittedly, the naming convention sucks, since a trap-door one-way function is not a one-way function), see also http://en.wikipedia.org/wiki/Trapdoor_one_way_function)

			[[User:Meriton\|Meriton]] 16:39, 7 March 2006 (CST)

2006-03-07T22:18:21Z

← Older revision		Revision as of 18:18, 7 March 2006
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	In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.		In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.

	[[User:Z-man\|Z-Man]]		[[User:Z-man\|Z-Man]] 16:18, 7 March 2006 (CST)

2006-03-07T22:17:21Z

← Older revision		Revision as of 18:17, 7 March 2006
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	In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.		In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.

	-Z-Man ~~(how do you automatically add a signature? The previous poster obviously doesn't know either :))~~		[[User:Z-man\|Z-Man]]

2006-03-07T22:12:19Z

← Older revision		Revision as of 18:12, 7 March 2006
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	In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.		In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.

			-Z-Man (how do you automatically add a signature? The previous poster obviously doesn't know either :))

2006-03-07T22:11:13Z

← Older revision		Revision as of 18:11, 7 March 2006
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	H needn't to be a trap-door hash function (no trap-door is used in the protocol). I am not sure about the proper requirement, though.		H needn't to be a trap-door hash function (no trap-door is used in the protocol). I am not sure about the proper requirement, though.

			In my book, a trapdoor function is one that is practically non-invertible, that means that no good way to find a X so that H(X)=Y for a given Y is known and that one hopes this stays that way. That property certainly is required, or the game server can determine the user's password or something that is as good as the password.

2006-03-06T19:55:31Z

← Older revision		Revision as of 15:55, 6 March 2006
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	H needn't to be a trap-door hash function (no trap-door is used in the protocol~~, collision resistance is~~ not ~~required)~~, ~~just a one-way function~~.		H needn't to be a trap-door hash function (no trap-door is used in the protocol). I am not sure about the proper requirement, though.

2006-03-06T19:29:25Z

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H needn't to be a trap-door hash function (no trap-door is used in the protocol, collision resistance is not required), just a one-way function.