This weekend's GreyCatCTF had an interesting "Reverse 101" challenge in the "EZPZ" category. In "nc" a number of questions were asked on the binary, and the most interesting one was what a certain function did (RC4 encrypt) and what input is required to get the flag.

Besides ghidra & gdb, angr was very helpful here to get the plaintext for the RC4 encryption. See pictures for details.

#greycat #ctf #cybersecurity #angr #reverseengineering #rc4 #decrypt #ezpz #writeup #notawriteup #lazy

You probably missed it?

#GoodMorning #Bonjour
I was out wetting the t'mater plants (in case of Frost): The sky was bursting with colours.

Hey #HRM, remember to #Vote, online voting is open now. #EZPZ info here:
https://www.halifax.ca/city-hall/elections #MasonForMayor
We've appointments in city of #Halifax today, where all Provincial #Healthcare is consolidated for inconvenience sake 🤔