Julekalender 2021 - Luke 4

20 Dec 2021 av Alexander Bergenholtz

Trenger du et avbrekk fra eksamenslesing? Helt Sikker vil de fire søndagene før jul publisere en liten CTF-oppgave. Alle som løser oppgaven er hver uke med i trekningen av et foodora-gavekort! Det blir en ekstra trekning på slutten blant de som løser alle fire :)

Her er fjerde luke:

Package Exchange

Everyone loves christmas games, and this year is no exception. We are going to be swapping presents… A lot. But you saw one present that seemed way more interesting than the rest. Can you make out a way to ensure that this specific present lands in your hands by the end of the game?

Hints:

• This time you have to see, but not sharp.
• Whats the problem with pseudo-random number generators?
• If you have the program and you have control of the execution, you can skip the fluff and go straight to whats interesting.
• Is the game rigged??
• There are similarities between this and the challenge from the second week.

You present can be found here: package_exchange.zip

Please submit your answer here.