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Date: Wed, 26 Mar 2014 18:15:27 -0500 From: Hon1nbo <hon1nbo.list@...il.com> To: Daniel Miller <bonsaiviking@...il.com>, fulldisclosure@...lists.org Subject: Re: [FD] Master Lock random key code generation/distribution Fails This still reduces the overall key space to only a handful in a given year, over a large area covered by distribution centers, compared to the full key space of any pin tumbler lock. Rather than carrying around thousands og possible keys, only around 52 assuming a new stock every week for a particular lock. If the store orders a larger batch and every two weeks, then 26 keys. -Hon1nbo On 3/26/2014 4:38 PM, Daniel Miller wrote: > On 03/26/2014 02:17 PM, Jimb0 Hon1nbo wrote: >> First this is not a physical finding in the normal sense, but a finding >> that Master Lock does not properly generate key codes differing in each >> batch, or that they do not randomize distribution of said key codes. >> >> After visiting a home depot, I found the following problem: among every >> model of padlock with a key, each model was matched in key codes for the >> entire model stock. I walked in for one set of matching locks (a little >> three or four pack), and I walked out with multiple sets all matched >> (will >> I trust these locks, no). WE checked every lock in stock and they all had >> the same issue. >> >> Example, every if buying Master Lock model "A", every model "A" would >> have >> the same key code. >> If model "B," every model "B" has the same key code. >> >> This means that with every stock a store like Home Depot receives, >> there is >> only one key combination for each model of lock. If a store only >> receives a >> few shipments a month, then there are only a few possible keys. If that >> store happens to be a large, if not only, source of locks in the area, >> then >> you have the probable key combination at each store >> >> attached is a photo I took showing a matched set I pulled off the >> shelf to >> buy when I found it. >> >> PS: This is not the special order contractor stuff that is designed to >> have >> the same key code, but individual packaged products on the shelf. >> >> >> -Hon1nbo >> >> >> _______________________________________________ >> Sent through the Full Disclosure mailing list >> http://nmap.org/mailman/listinfo/fulldisclosure >> Web Archives & RSS: http://seclists.org/fulldisclosure/ > Hon1nbo, > > I worked at a Home Depot for 4 years, and I can confirm that this is > standard practice, not only for Master locks, but also for the common > household entry locks like Schlage and Kwikset, though in those cases > the lot sizes are smaller (2 sets of 3 like-keyed boxes in a case of 6). > This is for the convenience of the customer who wishes to have a set of > like-keyed padlocks for their home and does not want to pay a locksmith > to rekey them. > > Although all the locks you checked that day were identical, the chances > of a burglar finding the customer who bought the same lock within a week > or two (locks are fairly high-volume) are low compared with the relative > ease of picking them, destructive entry, or just finding someone who > didn't lock their stuff up. > > Dan > > _______________________________________________ Sent through the Full Disclosure mailing list http://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
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