OMG 80 points Solves: 218 Easy I apologize for this one I annoyed myself creating it 🙂 Solving Just cat the file… you will the flag in kind of ascii-art. Maybe you need to zoom out a bit. Here is a screenshot of my console: EZ-CTF{1_HAT3_TH15_FL4G}
No Kidding 70 points Solves: 209 Easy No Other Kids Invent Anything like this…lol Flag Format EZ-CTF{WHATEVER_THE_MESSAGE_IS_ALL_CAPS} Solving This looks like Multi-tap or something similar… let’s just use the numbers and see what happens. I’ll use dcode.fr for this. 8/44/444/7777\\\444/7777\\\8/44/33\\\555/2/6/33/7777/8\\\222/8/333\\\333/555/2/4\\\33/888/33/33/33/33/777 T H I S\\I S\\T H E\\L A M E S T\\C T F\\F L A G\\E V E E
More Sense 60 points Solves: 123 Easy This is too easy! You will make more sense of it in no time! Flag format: EZ-CTF{ALL_CAPS_MESSAGE} File: Morse Sense.txt Solving A quick look at the message and I knew I was f…. lost. A long time I was banging my head against a wall. Because a quick lookup (cipher identifier) just told
McFly 125 points Solves: 14 Easy Riib_fc_I1deo_B1ff3n_Bpz_Yoo_Mdsxfkt_XoPxhatt Flag format: EZ-CTF{D3c0d3d_Message} Solving This is a fun one 🙂 The hint for the challenge is this given picture Okay what do we see here? This is Biff, the oponent of Marty McFly from the back to the future movies… a classic 😀 But something seems off in this picture… in the movie
would-you-wordle Points: 250 Someone left this secret text string and unfinished Wordle. Can you put them together to get the flag? pUpPHg3KfB15MG2KGtQQMDEECPOF8oa3VA== Solving Okay lets have a look at it. The hint tells us something about "Ron’s code". This should be RC4 according to this: RC4 (for ‚Ron’s Code 4‘) is a stream cipher developed by Ronald L. Rivest in
new-algorithm Points: 75 On the first day of the job, a new cryptography intern is insisting to upper management that he developed a new encryption algorithm for the company to use for sensitive emails and should get a raise. This seems too good to be true… are you able to prove the intern wrong by decrypting it? Here’s an example
Torrent Analyze Description SOS, someone is torrenting on our network. One of your colleagues has been using torrent to download some files on the company’s network. Can you identify the file(s) that were downloaded? The file name will be the flag, like picoCTF{filename}. Captured traffic. Solving Loading the pcap file into wireshark and started looking at it. At the beginning
St3g0 Description Download this image and find the flag. Download image Solving Looking at the hint We know the end sequence of the message will be $t3g0. Okay, I did some google research with that $t3g0 and found an interessting article. Downloaded the script from the github repo run it with the image FLAG 🙂 #import libraries import sys import
Vigenere Description Can you decrypt this message? Decrypt this message using this key "CYLAB". Solving Lets use CyberChef for that. Copy the message into the input field and use Vigenère Decode The key is given Key: "CYLAB"
Substitution Challenges Because this challenges are all very similar, we will not describe them in own articles 🙂 . Solving Substitutions cypher replace the 26 letters of an alphabet with other letters (one letter matches only one other). If you can find out which letter was replaced with which letter, then you can crack this cypher relatively easily. The best