This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading
Follow this tutorial. This applies to the reply from @Cazuma Nii Cavalcanti. In short once you are at the first install page go to tools in the nav bar and open the terminal, in the terminal type date MMDDHHmmYY replacing the letters as follows.

MM - 2 digit month  01 - 12
DD - 2 digit date   01 - 31
HH - 2 digit hour   01 - 24
mm - 2 digit minute 01 - 59
YY - 2 digit year   &gt; 15


once that is done go through the install normally. I just tried it and it worked with a USB install of OS X (10.11 - El Capitan) and it worked like a charm!

If setting to correct date doesn't work. Set to a date just after the os release.