Authentication

• Points: 9

Analyzation

Get into the administration page, it says

Forbidden Access!

This part of the site is reserved to the admin! 

Check cookie

b14361404c078ffd549c03db443c3fede2f3e534d73f78f77301ed97d4a436a9fd9db05ee8b325c0ad36438b43fec8510c204fc1c1edb21d0941c00e9e2c1ce2

This is the SHA512 hash. Decrypt it, that value is hash of "user".

Solution

SHA512 hash of "admin" is

c7ad44cbad762a5da0a452f9e854fdc1e0e7a52a38015f23f3eab1d80b931dd472634dfac71cd34ebc35d16ab7fb8a90c81f975113d6c7538dc69dd8de9077ec

Replace it to the cookie and get the flag.

The flag is

W3C{iaobjej4g}