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From: laman@sdcsvax.UUCP (Mike Laman)
Newsgroups: net.games.rogue
Subject: Re (SPOILER!): Monster Rooms and Patching Rogue binaries
Message-ID: <1020@sdcsvax.UUCP>
Date: Fri, 20-Jul-84 17:35:50 EDT
Article-I.D.: sdcsvax.1020
Posted: Fri Jul 20 17:35:50 1984
Date-Received: Sun, 22-Jul-84 06:10:00 EDT
References: <2212@dartvax.UUCP>
Organization: EECS Dept. U.C. San Diego
Lines: 14

>		... (For whatever it is worth, we figured how "they"
>	encrypt the saved file. Older versions used a simple mask, 5.3
>	uses one large mask and one smaller sliding mask.)

Wrong!  It uses two sliding masks (one points to the "old" encstr (encryption
string) and another one points at statlist which is treated just like encstr)
AND a local "Frob" is XORed in too.  This answers your questions of why 5.3
seems to take longer to save and restore games.  Earlier version (5.2, and 3.6
that I know about) just had one pointer to "encstr" that was XORed, instead of
3 XORs AND modifying the local frob (a multiplication and an addition).  It
all adds up when you you have to do it too each character in the save file.

		Mike Laman
		UUCP: {ucbvax,philabs,sdccsu3,sdcsla}!sdcsvax!laman