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Zelda Classic quests may have password protection to retard the stealing of personal resources, such as maps and tiles. Unfortunately, quest passwords are very weak, and there are a number of programs to crack quests to reveal their passwords. For this reason, it is strongly recommended that quest makers use unique passwords for the protection of their other password-protected things, such as e-mail accounts and forum memberships.
Beginning with version 2.11 betas, passwords are protected with a one-way MD5 hash, typical of most password systems. This still cannot prevent someone from cracking open a quest, which by necessity must be accessible to the game engine without knowing the quest's password, but such a person will be unable to see the clear-text of that quest's password.
Once again, if you choose to protect your quest, protect yourself too by using a unique password.