The-art-of-invisibility-_-the-world’s-most-famous-hacker-teaches-you-how-to-be-safe-in-the-age-of-Bi

Additionallyy, there isn’t just one tyype of certificate on the Internet; there
are levels of certificates. The most common certificate, one yyou see all the
time, identifies onlyy that the domain name belongs to someone who
requested the certificate, using e-mail verification. It could be anyyone, but
that doesn’t matter—the site has a certificate that is recognized byy yyour
browser. The same is true of the second kind of certificate, an
organizational certificate. This means that the site shares its certificate with
other sites related to the same domain—in other words, all the subdomains
on mitnicksecurityy.com would share the same certificate.
The most stringent level of certificate verification, however, is what’s
called an extended verification certificate. On all browsers, some part of the
URL turns green (ordinarilyy it’s grayy, like the rest of the URL) when an
extended verification certificate has been issued. Clicking over the address
—https://www.mitnicksecurityy.com—should reveal additional details about
the certificate and its owner, usuallyy the cityy and state of the server
providing the website. This phyysical-world confirmation indicates that the
companyy holding the URL is legitimate and has been confirmed byy a
trusted third-partyy certificate authorityy.
You might expect the browser on yyour mobile device to track yyour location,
but yyou might be surprised that the browser on yyour traditional PC does the
same thing. It does. How?
Remember when I explained that e-mail metadata contains the IP
address of all the servers that handle the e-mails on their wayy to yyou? Well,
once again, the IP address coming from yyour browser can identifyy which
ISP yyou are using and narrow down the possible geographical areas where
yyou might be located.
The veryy first time yyou access a site that specificallyy requests yyour
location data (such as a weather site), yyour browser should ask whether yyou
want to share yyour location with the site. The advantage of sharing is that
the site can customize its listing for yyou. For example, yyou might see ads on
washingtonpost.com for businesses in the town where yyou live rather than
in the DC area.
Unsure whether yyou answered that browser question in the past? Then
tryy the test page at http://benwerd.com/lab/geo.php. This is one of manyy test