CTFtime.org

Light N' Easy

by hawkcurry / hackstreetboys

Rating: 5.0

This is really more of a programming task rather than. We interpret the binary digits as input to a 7 segment display:

![7-segment-display](https://www.electronics-tutorials.ws/wp-content/uploads/2013/10/segment4.gif)

Implementation of the 7 segment display "pretty printing" is found in the URL.

__Input:__

```
01001110-00100000-00111010-00001100-11011110-00011110-00000000-01100000-00101010-01111010-00100000-11110110-00111010-00000000-11111110-00001100-00111000-11011110-00000000-10111100-00001010-11011110-11011110-00101010-00000000-01110110-11011110-00001100-00001100-00111010-01010110-00000000-11111100-00001010-11111010-00101010-11110110-11011110-00000000-11101110-11011110-01111011-00000000-10001110-00001100-11111010-11110110-00000000-00100000-10110110-00000000-00011101-10011111-01111011-10110111-11111110-00001010-00100000-00101010-11110111-01111000-00111010-01100111-10001100-00111011-10101010-11011110
```

__Output:__

```raw
XXX
X X X X X X
X X X X X X
X X X X X X
XXX XXX XXX XXX
X X X X X X X
X X X X X X X
X X X X X X X
XXX XXX XXX

XXX
X X X X
X X X X
X X X X
XXX XXX XXX XXX
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
XXX XXX XXX

XXX XXX
X X X X X
X X X X X
X X X X X
XXX XXX
X X X X X X
X X X X X X
X X X X X X
XXX XXX XXX

XXX XXX XXX
X X X X X
X X X X X
X X X X X
XXX XXX XXX XXX
X X X X X X X
X X X X X X X
X X X X X X X
XXX XXX XXX

XXX
X X X X X X X X
X X X X X X X X
X X X X X X X X
XXX XXX XXX XXX
X X X X X X
X X X X X X
X X X X X X
XXX XXX XXX XXX

XXX XXX XXX XXX
X X X X X X X
X X X X X X X
X X X X X X X
XXX XXX XXX XXX XXX
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
XXX XXX XXX XXX

XXX XXX
X X X X X
X X X X X
X X X X X
XXX XXX XXX
X X X X X
X X X X X
X X X X X
XXX XXX X

XXX XXX XXX
X X X X X
X X X X X
X X X X X
XXX XXX XXX
X X X X X
X X X X X
X X X X X
XXX XXX

XXX
X
X
X
XXX
X X
X X
X X
XXX

XXX XXX XXX XXX XXX XXX XXX
X X X X X X X X X X X X X X
X X X X X X X X X X X X X X
X X X X X X X X X X X X X X
XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX
X X X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X X X X X X X X
XXX X XXX X XXX X XXX X XXX XXX X XXX XXX X XXX X XXX
```

__Flag:__

```
d4rk{L.E.d.s.Bring.Joy.To.me}c0de
```

Original writeup (https://github.com/pberba/ctf-solutions/blob/master/20180816_hackcon/crypto/50_light_n_easy/README.md).

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