Protecting and Reading password from text file

My requirement is that, when the workbook is opened all but Sheet1 should not be visible.
The other sheet should be visible after inputting the password, which should be read from
the textfile text2.txt.Currently, this is the last line in the text file, which is "1415167".But actualy, this should be the 15th line after the first date appearance.
so, in the example file, the 1st date appearance is 04/01/2010, so 15 lines after that would
be 1st occurance of "Word to find" and then "TEST" is the username and then 1234567 is the password.

Note : the current as given by the tools--> protection method is 123

Attaching the excel file as well as the text file.