1. Authentication method

2. Academic reception

3. See also

4. Media coverage

5. Notes

GrIDsure went into liquidation in October 2011 after investor funding dried up.^[4]

On 18 November 2011 Cryptocard announced it has acquired the intellectual property of GrIDsure which includes 8 patents that have been granted and a further 16 pending. Cryptocard was already a GrIDsure OEM partner and uses the product in their portfolio.{{fact|date=May 2018}}

Authentication method

In order to authenticate, the user is asked to input a series of numbers based on a preregistered pattern on a grid (that the user knows) and a grid of pseudo-random numbers generated by the authenticator. This results in a different series of numbers each time the user authenticates.^[5]

Academic reception

A study was carried out on the statistical security of GrIDsure by Richard Weber in the Statistical Laboratory of the University of Cambridge. He concluded "This is one of the most beautiful ideas I have seen in many years of looking at algorithms and optimisation problems." {{Citation needed|date=March 2012}}

In March 2008, an independent security researcher, Mike Bond,^[6] identified flaws^[7] in the Gridsure authentication scheme, specifically commenting on Weber's analysis, and concluded:

"The Gridsure authentication mechanism remains largely unproven. Studies so far are flawed or taken out of context; my own initial studies indicate further weaknesses."

The introduction to Dr Bond's paper states "This document is not intended to be a fully representative or balanced appraisal of the scheme."{{Citation needed|date=March 2012}}

University College London conducted a usability trial.

In a covering letter to the study report, Professor Sasse states:

"Having looked at many mechanisms which have been proposed in recent years to overcome users' problems with PINs and passwords, this is the first one that has the potential to offer good usability and increased security at the same time."{{Citation needed|date=March 2012}}

See also

• security tokens
• Two Factor Authentication

Media coverage

• The Institute of Engineering & Technology [https://web.archive.org/web/20080129055032/http://www2.theiet.org/oncomms/sector/magazine.cfm?issueID=219 Grid Expectations]
• The Register [https://www.theregister.co.uk/2007/10/04/pin_fraud/ UK start-up tackles PIN fraud with patterns]
• Info Security Magazine [https://web.archive.org/web/20081121224136/http://www.infosecurity-magazine.com/news/071025_Gridsure.html Card issuer to adopt graphical Pin randomiser]
• Security Park [https://web.archive.org/web/20071023084344/http://www.securitypark.co.uk/security_article259966.html Pattern-based ID verification system combats online fraud]
• Computing.co.uk banks seek fraud solutions
• Cambridge Evening News [https://archive.is/20070721081410/http://www.cambridge-news.co.uk/business/news/2007/10/09/e82ba8a4-a675-4e5a-aeda-338a3114153b.lpf ID system the "perfect solution" to fight fraud]
• The Guardian Unlimited Pick a pattern, not a PIN
• The Sunday Times Sudoku-style codes planned to defeat bank fraudsters

Notes

• Simon Block
• Simon Bloomberg
• Simon Blunt
• Simon, Bob
• Simon Bokminster
• Simon Bolivar Buckner, Jr.
• Simon Bolivar International Bridge
• Simon Bolivar (Talacca)
• Simon Bolivar University (Mexico)
• Simon Bolivar University (Mexico City)
• Simon Bolivar Youth Symphonic Band
• Simon Bolze
• Simon Bonwick
• Simon Booth
• Simon Booth (Australian rugby league)
• Simon Booth (English rugby league)
• Simon Booth (rugby league)
• Simon Booth (rugby league, born 1956)
• Simon Booth (runner)
• Simon Borrows
• Simon Bovey
• Simon Bowes-Lyon, Lord Glamis
• Simon Bowyer
• Simon Boyle
• Simon Boyle (chef)