Abstract
Text-based passwords are widely used for the authentication of digital assets. Typically, password security and usability is a trade-off, i.e. easy-to-remember passwords have higher usability that makes them vulnerable to brute-force and dictionary attacks. Complex passwords have stronger security but poor usability. In order to strengthen the security in conjunction with the improved usability, we hereby propose a novel graphical authentication system. This system is a picture-based password scheme which comprises of the method of image splicing. Authentication data were collected from 33 different users. The usability of the method was evaluated via a comparison between the number of correct and incorrect authentication attempts and time taken. Additionally, a comparison was made between our proposed method and a complex text-based password authentication method using the authentication success rate. Authentication using image splicing proved to be resilient to brute-force attacks since the processing of images consumes a voluminous password space. The evaluation of the usability revealed that graphical passwords were easy-to-remember, resulting in a higher number of correct attempts. The proposed method produced 50% higher success rate compared to the text-based method. Findings motivate the use of the proposed method for securing digital assets.
Highlights
Secure authentication is a major concern in computerized system security
To overcome the problem of using complex passwords, alternate methods are designed such as biometric systems [5] for secure authentication
A graphical password technique was developed for user authentication
Summary
Secure authentication is a major concern in computerized system security. Most of the current authentication systems employ text-based passwords. To overcome the problem of using complex passwords, alternate methods are designed such as biometric systems [5] for secure authentication. A problem in using graphical passwords is that, the authentication requires a massive pool of images in order to make the process secure. The storage and processing of images requires huge memory size Another problem in using graphical passwords is the extensive consumption of time taken for authentication compared to using textual passwords. An example is a graphical authentication method developed in [22] In this method, a user is required to recognize pre-selected images in a sequence. In order to quicken the log-in process, an assisted graphical password method was proposed that used approximation of pre-selected locations in a picture [18]. The log-in speed is enhanced using SHA-1 hashing and image splicing
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