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Passwords decay, words endure: secure and re-usable multiple password mnemonics

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Passwords decay, words endure: secure and re-usable multiple password mnemonics

Content Provider	ACM Digital Library
Author	Atallah, Mikhail J. Topkara, Umut Topkara, Mercan
Abstract	Research on password authentication systems has repeatedly shown that people choose weak passwords because of the difficulty of remembering random passwords. Moreover, users with multiple passwords for unrelated activities tend to choose almost similar passwords for all of them. Many password schemes have been proposed to alleviate this problem, but they either require modification to the password entry and processing infrastructure (e.g., graphical passwords) or they require the user to have some trusted computing power (e.g., smartcard-like portable devices, browser plugins, etc). We propose a scheme that is applicable to any existing system without any modification, as it does not require any form of involvement from the service provider (e.g., bank, brokerage). Nor does it require the user to have any computing device at hand (not even a calculator). Our approach consists of generating a mnemonic sentence that helps the users remember a multiplicity of truly random passwords, which are independently selected. The scheme is such that changes to passwords do not necessitate a change in the mnemonic sentence that the user memorizes. Hence, passwords can be changed without any additional burden on the memory of the user, thereby increasing the system's security. An adversary who breaks one of the passwords encoded in the mnemonic sentence does not gain information about the other passwords. A key idea is to split a password in two parts: One part is written down on a paper (helper card), another part is encoded in the mnemonic sentence. Both of these two parts are required for successfully reproducing the password, and the password reconstruction from these two parts is done using only simple table lookups. Passwords' renewal requires only the re-generation of the helper card. Our scheme resolves the apparent contradictory requirements from most password policies: That the password should be random, and that it should be memorized and never written down. This makes possible passwords that are more secure against an adversary who illicitly gains access to the password file, as a dictionary attack is now unlikely to succeed (the attacker now needs to carry out a more daunting brute force enumerative attack). Even if the adversary somehow obtains the helper card, it gets quantifiably limited information about the passwords of the user (so the helper card may be lost or stolen without disaster immediately striking the user). We quantify the time period required for this adversary to successfully crack the password.
Starting Page	292
Ending Page	299
Page Count	8
File Format	PDF
ISBN	1595934804
DOI	10.1145/1244002.1244072
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2007-03-11
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Authentication Passwords Natural language processing Usability Mnemonic sentence
Content Type	Text
Resource Type	Article

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