Persuasive cued click-points: Design, implementation, and evaluation of a knowledge-based “Graphical password authentication using cued click points. Request PDF on ResearchGate | Graphical Password Authentication Using Cued Click Points | We propose and examine the usability and. Cued Click Points Password Authentication using Picture Grids. Article (PDF . new click-based graphical password scheme called Cued.
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An important usability goal for authentication systems is to support users in selecting better passwords, thus increasing security by expanding the effective password space.
Computer Security Applications Conf. Graphical passwords were originally defined by Blonder It is a type of capture attack. Attackers who gain knowledge of these hotspots through harvesting sample passwords or through automated image processing techniques can build attack dictionaries and more successfully guess PassPoints passwords . One preliminary study  suggests that password sharing through verbal description poitns be possible for PassPoints.
Using a graphical password, users click on images rather than type alphanumeric characters. It was found that although relatively usable, security concerns remain.
The usability and security of this scheme was evaluated by the original authors [18,19] and subsequently by others [1, 16, 17]. They either consistently shuffled a lot at each trial or barely shuffled during the entire session.
In such systems, users identify and target previously selected locations within one or more images. In this login procedure see figure 6first user enters graphidal unique user ID as same as entered during registration. We suspect that PCCP participants had more difficulty initially learning their password because they were selecting click-points that were less obvious than those chosen by PassPoints and CCP participants.
Each image consists of different characters image detailsamong which the participant needs to click on any one point of his choice to make it a click point in the series. Each image consists of only one click point as a user password.
Graphical Password Authentication Using Cued Click Points
All three cued-recall schemes discussed PCCP, CCP, and PassPoints are susceptible to shoulder surfing although no published empirical study to date has examined the extent of the threat. The viewport is positioned randomly rather than specifically to avoid known hotspots, since such information could be used by attackers to improve guesses and could also lead to the formation of new hotspots.
Because it will take more time to select a click point on 5 different images, but it provides more security. A possible strategy for increasing security is to enforce a minimum number of click-points, but allow users to choose the length of their password, similar to minimum text password lengths. Those who shuffled a lot felt that the viewport hindered their ability to select the most obvious click-point on an image and that they had to shuffle repeatedly in order to reach this desired point.
GRAPHICAL PASSWORD AUTHENTICATION USING PERSUASIVE CUED CLICK POINT | Open Access Journals
Our results show that our Persuasive Cued Click Points scheme is effective at reducing the number of hotspots areas of the image where users are more likely to select click points while still maintaining usability. Similarly the participant select a click point each of the images. The viewport and shuffle buttons only appeared during password creation.
PassPoints passwords from a small number of users can be used  to determine likely hotspots on an image, which can then be used to form an attack dictionary. This attack occurs when attackers directly obtain the passwords or parts thereof by intercepting the user entered data or by tricking users into revealing their passwords. Below flowchart see Figure 5 shows the user registration procedure, this procedure include both registration phase user ID and picture selection phase.
LNCS, We now consider how these could be leveraged in guessing attacks. The click-point distribution across users will be more randomly dispersed and will not form new hotspots. Although attackers must perform proportionally more work to exploit hotspots, results showed that hotspots remained a problem . During each trial, participants answered Likert-scale questions correspond to those reported in the previously cited studies A Likert scale is a psychometric scale commonly involved in research that employs questionnaires.
Click Passwords Under Investigation. We summarize the main issues below. In effect, this authentication schemes makes choosing a more secure password the path-of-least-resistance.
GRAPHICAL PASSWORD AUTHENTICATION USING PERSUASIVE CUED CLICK POINT
Effects of Tolerance and Image Choice. Creating a poijts password with different click-points results in a different image sequence. The theoretical password space for a password system is the total number of unique passwords that could be generated according to the system specifications. In general, graphical passwords techniques are classified into two main categories: The attack guesses approximately half of passwords collected in a field study on the Cars and Pool images two of the 17 core images with a dictionary containing entries, relative to a theoretical space of PCCP encourages and guides grzphical in selecting more random click-based graphical passwords.
To explore an offline version of this attack, assume in the worst case that attackers gain access to all serverside information: When logging on, seeing passsord image they do not recognize alerts users that their previous click-point was incorrect and users may restart password entry.
Explicit indication of authentication failure is only provided after the final click-point, to protect against incremental guessing attacks.
In successful guessing attacks, attackers are able to either exhaustively search through the entire theoretical password space, or predict higher probability passwords i.