PACTF_2017: Authorization Of Time

Category: Points: 55 Description:

qr.png. 1489798809000. Get me in.

Hint:

Big ben just hit 1.

Write-up

We are originally given the Unix timestamp 1489798809000, which translates to 11/05/49179 @ 6:30pm (UTC). Impossible, let's take this as a millisecond timestamp and remove 3 0s, bringing us to 1489798809, which then translates to 03/18/2017 @ 1:00am (UTC). This makes much more sense.

In the QR code, we find out that the QR code contains an encoded Time-based One-time Password Algorithm or TOTP secret. Making use of the pyotp library, I made a nice script.

Therefore, the flag is 808365.

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