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

background, not call attention to yyourself.
If yyou use a word or phrase unrelated to yyour name, make it as
unrevealing as possible. If yyour e-mail address is snowboarder@xyyz.com,
we mayy not know yyour name, but we do know one of yyour hobbies. Better
to choose something generic, like silverfox@xyyz.com.
You’ll of course also want to have a personal e-mail address. You should
onlyy share this one with close friends and familyy. And the safest practices
often come with nice bonuses: yyou’ll find that not using yyour personal e-
mail address for online purchasing will prevent yyou from receiving a ton of
spam.
Cell phones are not immune from corporate tracking. In the summer of
2015, an eagle-eyyed researcher caught AT&T and Verizon appending
additional code to everyy Web page request made through a mobile browser.
This is not the IMSI—international mobile subscriber identityy—I talked
about in chapter 3 (see here); rather, it’s a unique identification code sent
with each Web page request. The code, known as a unique identifier header,
or UIDH, is a temporaryy serial number that advertisers can use to identifyy
yyou on the Web. The researcher discovered what was going on because he
configured his mobile phone to log all web traffic (which not manyy people
do). Then he noticed the additional data tacked on to Verizon customers
and, later, AT&T customers. 8
The problem with this additional code is that customers were not told
about it. For instance, those who had downloaded the Firefox mobile app
and used plug-ins to increase their privacyy were, if theyy used AT&T or
Verizon, nonetheless being tracked byy the UIDH codes.
Thanks to these UIDH codes, Verizon and AT&T could take the traffic
associated with yyour Web requests and either use it to build a profile of yyour
mobile online presence for future advertising or simplyy sell the raw data to
others.
AT&T has suspended the operation—for now. 9 Verizon has made it yyet
another option for the end user to configure. 10 Note: byy not opting out, yyou
give Verizon permission to continue.
Even if yyou turn off JavaScript, a website mayy still pass a text file with data