# GryphonCTF_2016: Sanity Crypto

Category: Sanity Points: 5 Description:

Creator - Darren Ang (@txsouth)

## Write-up

We are given a string,

``````MDEwMDAxMTEgMDEwMDAwMTEgMDEwMTAxMDAgMDEwMDAxMTAgMDExMTEwMTEgMDAxMTAxMTAgMDAxMTAwMDEgMDExMTAxMTAgMDAxMTAwMTEgMDAxMTAxMDAgMDExMTAxMTEgMDAxMTAxMDAgMDExMTEwMDEgMDEwMTExMTEgMDExMTAwMDAgMDAxMTAwMDAgMDAxMTAwMDEgMDExMDExMTAgMDAxMTAxMTEgMDAxMTAxMDEgMDEwMTExMTEgMDAxMTAxMDAgMDExMTAwMTAgMDAxMTAwMTEgMDEwMTExMTEgMDAxMTAxMTAgMDExMTAwMTAgMDAxMTEwMDAgMDExMTExMDE=
``````

The equals at the back tell us this is probably base64. Using a base64 -> string, we get

``````01000111 01000011 01010100 01000110 01111011 00110110 00110001 01110110 00110011 00110100 01110111 00110100 01111001 01011111 01110000 00110000 00110001 01101110 00110111 00110101 01011111 00110100 01110010 00110011 01011111 00110110 01110010 00111000 01111101
``````

Which, of course is binary. Putting that through a binary -> ascii converter, we get

``````GCTF{61v34w4y_p01n75_4r3_6r8}
``````

Therefore, the flag is `GCTF{61v34w4y_p01n75_4r3_6r8}`.