full-disclosure - Master-Keyed Lock Vulnerability

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Message-ID: <000601c2c30c$1953ee70$6601a8c0@rms2>
From: rms at computerbytesman.com (Richard M. Smith)
Subject: Master-Keyed Lock Vulnerability

http://www.crypto.com/masterkey.html

Master-Keyed Lock Vulnerability 

Matt Blaze 
AT&T Labs -- Research 

16 January 2003, Revised 21 January 2003 

The threat

In a recent research paper ( http://www.crypto.com/papers/mk.pdf), we
describe weaknesses in most master-keyed lock systems, such as those
used by offices, schools, and businesses as well as by some residential
facilities (particularly apartment complexes, dormitories, and
condominiums). These weaknesses allow anyone with access to the key to a
single lock to create easily the "master" key that opens every lock in
the entire system. Creating such a key requires no special skill, leaves
behind no evidence, and does not require engaging in recognizably
suspicious behavior. The only materials required are a metal file and a
small number of blank keys, which are often easy to obtain. 

Needless to say, the ability for any keyholder to obtain system-wide
access represents a serious potential threat to the security of
master-keyed installations. Individuals and institutions that depend on
such locks to protect their safety and property should be aware of these
risks and consider alternatives to eliminate or reduce their exposure to
this threat. 

.....