Popular pen drive brands

Some of the popular pen drive brands are
Adata
Sony
Toshiba
Iball
Sandisk
MoserBaer
HP
Transcend
PNY
However most of these pen drives have backdoors which are easily exploited by NTRO/NSA officials who will corrupt the data whenever they feel like. If any visitor is aware of tamper proof and hacker proof pen drive brands, the information would be appreciated.