Home Hackvent 2015 Dec 4: Crypto 01
Writeup
Cancel

Dec 4: Crypto 01

Challenge

a classic / simple one

Unfortunately, no one can be told what this is. You have to see it for yourself.

1
HOlAfOVWOqVd1o6q7u5Vj8Mv-----

Solution

The string is exactly the length of a nugget, all the characters for HV15 are there as well as the 5 dashes. Maybe we just need to rearrange the characters somehow? We notice that the characters to form “HV15” are always 6 apart, so we create a grid:

1
2
3
4
5
HOlAfO
VWOqVd
1o6q7u
5Vj8Mv
-----

reading this top-to-bottom and left-to-right gives the nugget

Flag

HV15-OWoV-lO6j-Aqq8-fV7M-Oduv