Picoctf notepad writeup. ) recently finished their 2023 capture the flag.

Picoctf notepad writeup PicoCTF Our input local_48 is compared against 0x86187, which is 549255 in decimal. PicoCTF Writeups— Pitter, Patter, Platters. picoCTF 2024 We found this file. Project maintained by johantannh Hosted on GitHub Pages — Theme by mattgraham. 解法：將 isAdmin cookie 改為 1 在向 check. After downloading the file the first thing I noticed was that is was a . NUS High Appventure CTF (internal) Writeups. Overall, a pretty solid CTF with good forensics challenges where most of them were pretty simple while some Summary My solutions for the challenges I have solved in picoCTF 2023 Forensics hideme Ran zsteg which revealed that there is extra data after the image data ends our team's writeups for the 2021 PicoCTF competition. Nov 27, 2024. For example, if we post test, we are redirected to a URL such as From there, a name for the resultant file is generated using the first 128 characters of the content (!!), and then an arbitrary random suffix to avoid collisions. Automate any workflow Codespaces. “ANDERSON” then it encrypts it using SHA256 then picks a specific numbered character and Steganography Challenge — PicoCTF Writeup. No Padding, No Problem. Dachshund Attacks. Note: After seeing other people’s writeups, my At this point we can start to see a for loop type of logic occurring. python bash python3 ctf-writeups writeups writeup bash-scripting ctf-solutions picoctf ctf-writeup picoctfsolutions writeup-ctf picoctf Apr 9, 2021 · 2021年3月に開催されたpicoCTFに参加しました！CTF初心者でしたが、全体で162位とそこそこの好成績を収めることができました。慣れないですが、解けた問題につい A beginner-friendly picoCTF guide—complete challenges using only the webshell, no Linux or VM needed! - whiteSHADOW1234/picoCTF_writeup Write up of solutions to the picoCTF 2023 capture the flag (CTF) event from my submissions during the competition. Capture the Flag (CTF) is a type of cybersecurity competition that challenges participants to solve a BSides Noida CTF 2021 Basic Notepad writeup. After jumping to line 20, the value stored at ebp-0x4 increases by 0x1 and the value at ebp-0x8 increases by 0xa9. - TrooperZ/picoCTF2023-Writeups A bit of obfuscation, the code confuses you by checking substrings every 4 letters and not sequentially. " 難度：3 / 5. Overall, a pretty solid CTF with good forensics challenges where most of them were pretty simple while some PicoCTF2021-Writeup. The challenge description reads “Can Jan 19, 2024 · I'm not qualified to write a writeup for this challenge 😅. Day 29. 2 days quite fun. Just rearrange from split to split*8 and you will get the answer PicoCTF-2021 Writeup. - snwau/picoCTF-2023-Writeup This repository contains comprehensive writeups for various picoCTF challenges, covering domains such as Web Exploitation, Cryptography, Reverse Engineering, Forensics, General Skills, Binary Exploitation, and Uncategorised. There is a site. Write-ups for Hack-the-Box. Rusty. Step 1: We begin by opening the “values” file with 難度：1 / 5. CTF Writeup: picoCTF 2024 - "Trickster" The CTF. The Important Dates Web Exploitation. Each flag must be entered in the format “picoCTF{some letters and numbers here}”. This is a Movaps stack alignment issue. Instant dev environments Issues. From my understanding, smali code is an assembly language used for the Dalvik Virtual Machine (DVM) and this was overridden for the running of Mar 30, 2024 · picoCTF writeup: repetitions repetitions is an easy challenge in the general skills category, featured at the picoCTF 2023 event. Running the program and entering 549255 prints the flag: CTF Writeup: picoCTF 2023 - "Java Code Analysis!?!" The CTF. Overview: Category: Binary Exploitation Points: 20. You signed in with another tab or window. Day 22. Apr 9, 2024 Write up of solutions to the picoCTF 2023 capture the flag (CTF) event from my submissions during the competition. PicoCTF 2021 Writeups our team's writeups for the 2021 PicoCTF competition View on GitHub. Elliott. Aug 8, 2021. After downloading the APK, the screen is still same with droids0 and droids1 but this time the hint is “smali sounds like an ikea bookcase”. js. Compress and Attack. Opening it with notepad shows a PNG header: flag. 重點：zsteg. New Caesar. Find and fix vulnerabilities Actions. So my journey continues with the CTFs. I will create a separate folder for this challenge and put the downloaded file there Yep, the extension Welcome back amazing hackers, after a long time I am boosted again by posting a blog on another interesting jeopardy CTF challenge PicoCTF 2022. New Vignere. Lastly, the file is Write-ups for various challenges from PicoCTF. Where the actual flag value redacted for the purposes of this write up. . On October 31, 2021 November 1, 2021 By Daniel In CTF. ) recently finished their 2023 capture the flag. png. Hiding files inside of files really stumped me until I found a video. I have these 2 images, can you make a flag out of them? scrambled1. com/io12/pwninit00:00 - Intro00:18 - Interacting with the program01:45 - G In this post, I aim to explain my solution for the “SansAlpha” challenge from PicoCTF 2024’s “General Skills” category. Competition prizes have eligibility requirements. picoctf. picoCTF 2024 SQLiLite More SQLi SQL Direct Irish-Name-Repo 1 Irish-Name-Repo 2 Irish-Name-Repo 3 Web Gauntlet Web Gauntlet2 Web Gauntlet3 picoCTF 2024 writeup format string 3. 重點：CBC 加密. (I will finish the writeup for WinAntiDebug0x300 later). In this Easy Web Exploitation CTF tests our enumeration skills. I opened the file in HxD and it turns out that was exactly what it is. net:<port>, and run the binary named bin once connected. 01101110 becomes 0110 for the first and 1110 for the second), in which the integer value is the index of a letter in the list ALPHABET (e. Download libc here, download the interpreter here. Lists. CTF Web. You signed out in another tab or window. net 53437 A beginner-friendly picoCTF guide—complete challenges using only the webshell, no Linux or VM needed! - whiteSHADOW1234/picoCTF_writeup 代表透過 找出 subprocess 執行指令的方式，也就是 <class 'subprocess. There Blast from the past. png scrambled2. Omstaendlig. 重點：SQL Injection. I am exited to share my insights on this challenge. During the competition period, which was held between March 15th, 2022 and March 29th, 2022, I placed 248th out of 7,794 (top 3. Contribute to 3toe/PicoCTF-Transformation development by creating an account on GitHub. Movaps stack alignment. picoCTF writeup: repetitions. Aug 26, 2024. interencdec — PicoCTF Writeup. Note: After seeing other people’s writeups, my Write up of solutions to the picoCTF 2023 capture the flag (CTF) event from my submissions during the competition. Apr 9, 2024. When you go to the site JavaScript code is shown and displayed as a "bookmarklet for you to try". A quick google search told me this stood for Scalable Vector Graphics. We took part in the PicoCTF 2024 edition with our team. picoMini by redpwn 2021 - advanced-potion-making (forensics) 5/11/2021 — 1 minute read. md at master · kevinjycui/picoCTF-2019-writeup Last updated 8 months ago. Last updated 10 months ago 10 months ago Currently one writeup for the picoCTF 2022 noted Web exploitation challenge - dtreplin/ctf-writeups Oct 31, 2021 · Links to my picoCTF writeups. I wouldn't believe you if you told me it's unsecure! vuln. The challenge began with a brief description from the author: “I don’t like scrolling down to read the code of my website, so I’ve It’s a disk image, so we’ll unzip it using the gunzip <file_name> command. This web picoCTF Practice Writeup 1 picoGym Practice Challenges page=1 の12 問を勉強した記録. notepad: Web Exploitation: 250: college-rowing-team: Cryptography: 250: fermat-strings: Binary Exploitation: 250: droids0: Reverse Engineering: 300: picoCTF 2021 GET Solutions and writeups for the picoCTF Cybersecurity Competition held by Carnegie Mellon University - kevinjycui/picoCTF-2019-writeup We've got a binary that can list directories as root, try it out !! ssh to saturn. Mini RSA. Reload to refresh your session. picoCTF 2024 PicoCTF-2021 Writeup. 2%) among global participants (who solved at least one challenge) as a solo player with a score of 12,000 points. 說明：使用 zsteg 解析就出來了 Hello People, In this write up I have covered a walk-through for the picoCTF challenge called c0rrupt. net 53437 PicoCTF is a website offering a yearly CTF as well as a non-copetitive training ground called PicoGym. our team's writeups for the 2021 PicoCTF competition our team's writeups for the 2021 PicoCTF competition PicoCTF (1) Writeup: Operation Orchid. Status. Darin Mao. Popen'> ，並利用 communicate 獲取標準輸出與錯誤，使得 main process 可以等待 subprocess 完成，最後在將其用 utf-8 解碼出可讀文字，因此我們可以列出該 Write up of solutions to the picoCTF 2023 capture the flag (CTF) event from my submissions during the competition. This CTF consists of moderate to advanced-level challenges. req: A subcommand for working CanYouSee — PicoCTF Writeup. php 發請請求即可獲得 FLAG A list of writeups from the 2023 PicoCTF hacking competition from team cvhs_exe. txt: PNG image data, 1697 x 608, 8-bit/color RGB, non-interlaced. light dark. It’ll take a while, but once it’s done, type in ls to check the file contents in the directory you’re in. In this write-up, we are going to see some of the web exploitation We found this file. However for situations that may utilise higher orders of repetitions, a simply bash script to loop until solved, or base64 decode fails would be a better solution. This continues to loop because of the jle condition until ebp-0x8 is not less or equal to 0x47a6. Sign in Product GitHub Copilot. CanYouSee — PicoCTF Writeup. 說明：修改 cookie. What's your input? Cryptography. Dear Diary The PicoCTF Buffer Overflow 0 challenge provides the source code of a program, as well as the compiled program itself. Fixing a corrupt PNG file. Challenge Create a note and share with admin :eyes: Note : Bruteforce is not required. This will be a place for me to write some writeups for my solutions for problems by the PicoCTF. Join me on this journey as we explore and solve these challenges using Kali Linux tools, enhancing our cybersecurity skills. WillFromSwiss. I verify our team's writeups for the 2021 PicoCTF competition. Search. heap 0 — PicoCTF Writeup. 2. detailsCheck. Web Exploitation. About. SQL Database Version Check Cheat Sheet. Dear Diary A writeup detailing the solution to the “Trickster” challenge from picoCTF 2024. Day 24. Local Authority PicoCTF 2022. Contribute to Cajac/picoCTF-Writeups development by creating an account on GitHub. Feel free to explore the challenges and solutions in this repository. Here I will take picoctf challenge in a forensic category and use my own Linux environment. Play Nice. I started with Forensics, one of 難度：1 / 5. e. I was Solutions and writeups for the picoCTF Cybersecurity Competition held by Carnegie Mellon University - picoCTF-2019-writeup/General Skills/plumbing/README. Zarar Ahmed. Aug 27, 2024. 0110_2 = 6_10, ALPHABET[6] is added to the encryption) that will be This is a writeup for all forensics challenges from picoCTF 2024. DMFR SECURITY. So let’s get started. format string 3 (Binary Exploitation) This program doesn't contain a win function. I made a bot to automatically trade stonks for me using AI and machine learning. Welcome back, hackers! Today’s challenge is very fun! Day 28. because they render based on a Browse to the web site and you will see a registration web page with five text boxes and a Register button. November 2024 Created 2024-11-16T19:45 Updated 2024-11-16T19:48 1 min read 75 words. FLAG: picoCTF{read_mycert_373b4ab0} Here’s a breakdown of the keywords used in the OpenSSL command: openssl: The command-line tool for cryptographic operations. 重點：sleuthkit、disk. file confirms that this is a PNG file: % file flag. Testing the code "binary = "{0:08b}". picoCTF 2021 - Bizz Fuzz (pwn) 3 days ago · File Size : 858 KiB File Modification Date/Time : 2021:03:15 14:24:46-04:00 File Access Date/Time : 2021:03:16 15:08:38-04:00 File Inode Change Date/Time : 2021:03:16 15:08:32-04:00 File Permissions : rw-r--r--File Type : JPEG File Type Extension : jpg MIME Type : image/jpeg JFIF Version : 1. SoBatista. home. Jul 30, 2024 · droids2 screenshot. writeup; picoCTF; Posted at 2024-10-25. This web exploitation challenge began with the following description: Write up of solutions to the picoCTF 2023 capture the flag (CTF) event from my submissions during the competition. Reviews; About; Search for: Search. It's Not My Fault 1. In this article I will talk about the binary exploitation challenge ‘ropfu’ of picoCTF 2022. 02 Resolution Unit : None X Resolution : 1 Y 4 days ago · Learn how to exploit vulnerable C functions to "stack-smash" executables—this is my writeup for the picoCTF 2022 binary/pwn series "Buffer overflow". Skip to content. another security blog Menu. Brandon T. After struggling and battling very hard, our team made some quite good Our input local_48 is compared against 0x86187, which is 549255 in decimal. After posting a note, the note contents get saved to a file on the server and we can visit it and view the note. On a side note these are the writeups for the few questions we managed to complete. net 16439 Hints: Okay, maybe I'd believe you if you find my API key. Help. GitHub Gist: instantly share code, notes, and snippets. Start BURP Suite and configure your browser to use Burp as its proxy. #picogym#picoctf#superserial#webexploitation#web#carn 難度：1 / 5. You can Mar 30, 2022 · It worked locally but not on the remote server. 說明：這題有給你題示要用 srch_strings 來把 FLAG 抓出來，如下 More than 240 writeups for picoCTF challenges. If you’re segfaulting on a movaps instruction in You signed in with another tab or window. See more recommendations. This is a writeup for all forensics challenges from picoCTF 2024. Stonks. Matryoshka doll Overview. Download the source here. First, we downloaded the file called “values” (that you can obtain under “Challegge Description”). md at main · snwau/picoCTF-2024-Writeup Web Exploitation. Here we can see that how it checks the key. I searched for "IEND" and selected the part 🚩: picoCTF{jBhD2y7XoNzPv_1YxS9Ew5qL0uI6pasql_injection_af67328d} Trickster [300 PTS] This is a file upload vulnerability. 04-05-2024. 2021年3月に開催されたpicoCTFに参加しました！CTF初心者でしたが、全体で162位とそこそこの好成績を収めることができました。慣れないですが、解けた問題につい In this article I will talk about the binary exploitation challenge ‘ropfu’ of picoCTF 2022. txt flag. Then go to instructions. PicoCTF 2019 Writeups/Notes. txt. This is my writeup for the challenge "guess" in the pwn category from OSUSEC's DamCTF 2020. Double DES. Binary Gauntlet 1. repetitions is an easy challenge in the general skills category, featured at the our team's writeups for the 2021 PicoCTF competition format string 0 — PicoCTF Writeup. - snwau/picoCTF-2023-Writeup A writeup detailing the solution to the “Trickster” challenge from picoCTF 2024. Overall, a pretty solid CTF with good forensics challenges where most of them were pretty simple while some required some thinking to solve. Login as ctf-player with the supplied password. Day 30. home blog Toggle menu. Sep 6, Blast from the past. A bookmarklet could be created by bookmarking/starring the page and then editing the bookmark to put the JavaScript code in place of the URL field. The main page of the challenge shows us a URL to be used for cowsay as a Jul 14, 2024. An amazing, very first international contest in hacking for us. Easy Peasy. 說明：使用 zsteg 解析就出來了 難度：1 / 5. com/io12/pwninit00:00 - Intro00:18 - Interacting with the program01:45 - G Day 20. 2 min read. Binary Gauntlet 0. Since this shows up as whitespace and not any bizarre characters in notepad, I assume that e28083 is probably a Unicode character that is some kind of whitespace. It uses the binary encoded string username_trial i. These files are diffrent from png, jpeg, etc. This page contains my write picoCTF 2023 New to CTF? Before I get into the solutions allow me to explain what is a capture-the-flag (CTF) competition(s). Search Ctrl + K. README. Points: 200 Category: Cryptography. 說明：就很簡單的 SQL Injection. svg file. 說明： 解法： Previous Cookies Next Power Cookie. The CTF also had a long duration of 7 days so I managed to solve all of the forensics challenges before it ended. - snwau/picoCTF-2023-Writeup. c nc mercury. Next, there are some files linked to it like the CSS and JS. com/WhatTheFuzz-CTFs/picoCTFPwninit: https://github. Write better code with AI Security. You can see the flag() function for the display endpoint. Or more we can say having Feb 21, 2024 · 🔒 picoCTF: Challenges from the picoCTF platform. Running the program and entering 549255 prints the flag: SPOILER ALERT: This is a writeup for the PicoCTF “Information” challenge, which will end up in showing the solution to the problem. Midnight Sun CTF 2021 Corporate mfa writeup; After start of the instance picoCTF will provide you a link to running instance. Eric H. I promise I will do my best to keep this guide as beginner-friendly as possible, but a bit of general knowledge about binary exploitation is required to understand the following guide. picoCTF 2023 took place from March, 14th, 2023 to March 28th, 2023. CaaS is an easy challenge in the web exploitation category. picoCTF 2024 All challenges in the picoMini were written by high school students who placed in the top 3 teams in picoCTF 2019 and 2021. What is PicoGym ? "Build your CTF skills, help yourself advance your personal best score, and prepare for the big show using our mini Competitions to practice. Aug 19, 2024. All challenges in the picoMini were written by high school students who placed in the top 3 teams in picoCTF 2019 and 2021. From the picoCTF — Search Source Writeup — Web Exploitation The source writeup was an interesting 100 point web exploitation challenge so I thought I would do a writeup for it. js Write up of solutions to the picoCTF 2023 capture the flag (CTF) event from my submissions during the competition. 1337UP CTF 2024 Writeups (partial) Hey everyone. Since this shows up as whitespace and not any 🚩: picoCTF{adlibs} That concludes the writeups for all the challenges I solved (I will finish the writeup for WinAntiDebug0x300 later). picoCTF 2021 - Stonk Market (pwn) 3/31/2021 — 4 minute read. Today’s challenge was all about web exploitation. You can also find the file in /problems/c0rrupt_0_1fcad1344c25a122a00721e4af86de13. Finally, once the loop ends, we move the value stored at ebp-0x4 to the returned value eax. Solution: writeupを見るとFormat String Bugがあると書いて Write up of solutions to the picoCTF 2024 Capture the Flag (CTF) event from my submissions during the competition and any subsequent submissions (as noted). The following two lines split the binary number in half (e. In this series, I take a look at one of my favourite CTF exercises out there, known as “picoCTF”. So, this is my first time writing a ctf writeup. Like their previous capture the flags, they came with a number of web exploitation tasks for their contestants to picoCTF writeup: CaaS. 1ページ目から難問があり 647 solves の Stonks (Format String Exploit) には苦戦した。 Obedient Cat. There are multiple ways to approach this. When the file command displays "data" as the Make sure to submit the flag as picoCTF{XXXXX} Approach. js picoCTF 2019 WhitePages Writeup. g. Run the binary with these two files present in the same directory. picoCTF Writeups. Shuvro Hawk. These writeups are mainly a documentation for myself but I hope others will benefit from them as well. 🔑 Cryptography; 🌐 Web Exploitation; ⏪ Reverse Engineering; 🔍 Forensics; 🧩 Miscellaneous; Usage. format(ord(c))", it outputs the ascii value of c (values in the flag) in binary form. Written as part of learning experience. picoCTF 2024 took place from March 12th, 2024 to March 26th, 2024. Flask cookies use JWT to created a signed token we need to find the secret. Content Page. heap 0 You signed in with another tab or window. Pixelated. You switched accounts on another tab or window. Overall, really fun and interesting challenges (except C3) and I can’t wait to play again GitLab Writeup: https://gitlab. The goal here is to get the PicoCTF{“Flag”} as is any ctf challenge. 解法： 直接都下常用 Injection payload （’ or 1=1 --）就可以了 Web Exploitation. How can you win? Download the binary here. net 54820 and the system says to try entering “getRandomNumber” without double Oct 10, 2024 This is a writeup for all forensics challenges from picoCTF 2024. 解法： 直接都下常用 Injection payload （’ or 1=1 --）就可以了 Write up of solutions to the picoCTF 2024 Capture the Flag (CTF) event from my submissions during the competition and any subsequent submissions (as noted). Breaking the Mobile Barrier: Intercepting Android App Traffic with Burp Suite. it might related to smali code when reversing android app. Links to my picoCTF writeups. We saw tag XXE-> XML external entity and also, when we inspect static resources (F12 -> Sources in Google Chrome) of the site, we saw this two files:. Pixelated Overview. Go to robots. 重點：cookies. See SUMMARY for list of write-ups. Do not read if you don’t want to know the PicoCTf rsa-pop-quiz Writeup. The Challenge. HTB Writeups. Binary Exploitation. Recover the flag. picoCTF — Search Source Writeup — Web Exploitation. This was arguably my favorite set of Aug 18, 2024 · format string 0 — PicoCTF Writeup. - snwau/picoCTF-2023-Writeup # Writeup: Hello, and welcome to another picoCTF challenge write-up. - snwau/picoCTF-2023-Writeup Welcome to my writeups for picoCTF challenges. It reads the very_auth cookie and checks if it is "admin" if yes, then it will show us the flag. PicoCTF is a website offering a yearly CTF as well as a non-copetitive training ground called PicoGym. Tricky format string exploitation. Today’s challenge, “Binary Exploitation,” explores heap overflow, a lesser-known but powerful attack vector that targets dynamically allocated memory rather than More than 240 writeups for picoCTF challenges. On September 5, 2021 By Daniel In CTF. It is my Birthday 2. Hello! Reverse Shell. Write-up for a PicoCTF challenge. picoCTF 2019 Writeup. Register User Guide Complete Rules. xmlDetailsCheckPayload. PicoCTF Writeups: vault-door-1 The “Vault Door 1” challenge builds upon foundational concepts introduced in the Vault Door Training challenge, which serves as an Nov 29, 2024 Thank you for following along with today’s write-up. Navigation Menu Toggle navigation. - picoCTF-2024-Writeup/General Skills/Super SSH/Super SSH. Write-ups for various challenges from the 2022 picoCTF competition. For the sole purpose of proving people did stuff. The first thing I did was download the [enc] file and open it in notepad, revealing "灩捯䍔䙻ㄶ形楴獟楮 In this picoGym (picoCTF) Workout video, we do a writeup of the Super Serial web exploitation challenge. - snwau/picoCTF-2023-Writeup Last updated 8 months ago. One thought on “ picoCTF 2019 Writeup for notepad (web) Anna Hsu. web. The source writeup was an interesting 100 point web exploitation challenge so I thought I would do a writeup for it. 難度：1 / 5. Blog ; PicoCTF 2022: Buffer Overflow Series This is a writeup for the buffer overflow series during the picoCTF 2022 competition. Aug 21. Please try to solve these puzzles on your own before blindly following these writeups to get points. Category: General Skills In this post, I aim to explain my solution for the “SansAlpha” challenge from PicoCTF 2024’s “General Skills” category. In total you will find more than 240 challenge solutions here. - snwau/picoCTF-2024-Writeup GitLab Writeup: https://gitlab. picoCTF2019 writeup. Then when Thank you for reading today’s write-up! Binary exploitation can be confusing, especially for beginners, but it’s an excellent learning experience. picoCTF: Picker I Write-up I start with get in into the netcat: $ nc saturn. d. Description. Bear in mind this is my first day After start of the instance picoCTF will provide you a link to running instance. Then set 'Intercept' to off under the Proxy-> Intercept I'm not qualified to write a writeup for this challenge 😅. I decided to try something noone else has before. See you tomorrow for the next challenge! Day 27/31 format string 0 — PicoCTF Writeup. . picoctf2019-writeup. Master Mobile Traffic Hacking: Intercept Android App Data with Burp Suite. What is PicoGym? "Build your CTF Here are the writeups I’ve done for old picoCTF puzzles. our team's writeups for the 2021 PicoCTF competition. the output is data. Points: 30 Category: Forensics. c / ctf / picoctf / web / notepad / notepad. WhitePages is a forensics puzzle worth 250 points. This comment <!--Here's the first part of the flag: picoCTF{t --> gives us the first part of the flag. #picogym#picoctf#superserial#webexploitation#web#carn flag: picoCTF{caesar_d3cr9pt3d_f0212758} If you’re looking for more solutions, make sure to visit this repo. I have these 2 In this picoGym (picoCTF) Workout video, we do a writeup of the Super Serial web exploitation challenge. Outline. picoCTF (n. You switched accounts on another tab repetitions (PicoCTF 2023): Team: The_Dream_Team (6100 points) (160th place global) Description: Can you make sense of this file? Solution: Opening up the file in using notepad or any other text editor gives you a base64 decoded string, recognizable by the two equal signs at Jan 19, 2024 · our team's writeups for the 2021 PicoCTF competition Sep 3, 2024 · Contribute to Cajac/picoCTF-Writeups development by creating an account on GitHub. Look up a decimal to binary number conversion app on the web or use your computer's calculator! The str_xor function does not need to be reverse engineered for this challenge. Overall, really fun and interesting challenges (except C3) and I can’t wait to play again next year. dzmd cmqnxv koxx kvgfg remfk luoqap ksdws ycy itmphv sgnhpa