From: Chris Street 
Newsgroups: uk.finance uk.legal
Subject: Re: Credit Cards/Chip and Pin/ATM withdrawls
Date: Wed, 14 Dec 2005 23:28:11 +0000

On Wed, 14 Dec 2005 16:46:20 +0000, Cynic wrote:

> On Wed, 14 Dec 2005 10:26:43 GMT, wibble@email.com (sPoNiX) wrote:
> 
>>On Wed, 14 Dec 2005 10:19:13 -0000, "Peter Crosland"
>> wrote:
>>
>>>AFAIK all card issuers have the same rules. As for the risk it really is 
>>>minute 
>>
>>The risk of someone guessing the PIN is only 1 in 10000. Whilst the
>>risk is small it's certainly not insignificant.
> 
> IIUC you get 3 attempts to enter a PIN.  Therefore the chances of a
> correct guess on one of the attempts is 1 in 3333.

http://www.cl.cam.ac.uk/TechReports/UCAM-CL-TR-560.pdf