24% of London business wifi is open and unlocked
RSA, the security division of EMC, provide security and authentication solutions for networks and as such, like to commission research on the security habits of businesses in major metropolitan areas. Their latest research has just been released and it shows that only 76% of London business wifi networks are locked. Of these locked networks, half of them are using the weak WEP standard encryption instead of the stronger WPA varieties.
The statistics indicate that London is lagging far behind other major cities. Paris had 94% of its networks locked and New York led with 97% using some form of security.
Although the networks may not be using a security layer to prevent external access they may be using internal security to prevent unauthorised access. It seems to make more sense to cover your security holes at every point but the study should be taken with a grain of salt as it is meant to promote the RSA products.