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Erschienen in:
2019 | OriginalPaper | Buchkapitel
Multi-item Passphrases: A Self-adaptive Approach Against Offline Guessing Attacks
verfasst von : Jaryn Shen, Kim-Kwang Raymond Choo, Qingkai Zeng
Erschienen in: Digital Forensics and Cyber Crime
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Abstract
While authentication has been widely studied, designing secure and efficient authentication schemes for various applications remains challenging. In this paper, we propose a self-adaptive authentication mechanism, Multi-item Passphrases, which is designed to mitigate offline password-guessing attacks. For example, “11th July 2018, Nanjing, China, San Antonio, Texas, research” is a multi-item passphrase. It dynamically monitors items and identifies frequently used items. Users will then be alerted when there is need to change their passphrases based on the observed trend (e.g., when a term used in the passphrase consists of a popular item). We demonstrate the security and effectiveness of the proposed scheme in resisting offline guessing attacks, and in particular using simulations to show that schemes based on multi-item passphrases achieve higher security and better usability than those using passwords and diceware passphrases.