CTF | swanandx's blog

#theme-toggle,.top-link{display:none}@media(prefers-color-scheme:dark){:root{--theme:#1d1e20;--entry:#2e2e33;--primary:rgba(255, 255, 255, 0.84);--secondary:rgba(255, 255, 255, 0.56);--tertiary:rgba(255, 255, 255, 0.16);--content:rgba(255, 255, 255, 0.74);--hljs-bg:#2e2e33;--code-bg:#37383e;--border:#333}.list{background:var(--theme)}.list:not(.dark)::-webkit-scrollbar-track{background:0 0}.list:not(.dark)::-webkit-scrollbar-thumb{border-color:var(--theme)}}

Reverse Engineering : Java code

Challenge This was a easy challenge from HSCTF 8. We were given source code of a program which we had to reverse engineer and find the flag. import java.util.Scanner; public class WarmupRev { public static String cold(String t) { return t.substring(17) + t.substring(0, 17); } public static String cool(String t) { String s = ""; for (int i = 0; i < t.length(); i++) if (i % 2 == 0) s += (char) (t....

Reversing Binaries: CTF Edition

What is this about? I saw a lot of people struggling to solve easy reverse engineering (RE) challenges (me too when I was just starting), well, I am not saying I am great at it now, but have really improved my skills so that now I can solve many RE challenges in ctfs. That is why, I am writing this blog, hoping it will help at least a few people....