FireShell CTF 2020 Re Simple Encryption 1.代码分析 __int64 __fastcall sub_401CA0(signed int a1, __int64 *a2) { __int64 v2; // rsi __int64 v3; // rcx __int64 v4; // rdi __int64 v5; // rdx __int64 result; // rax __int64 v7; // rcx unsigned __int64 v8; // rt1 _...
🔹Simple_encryption 将程序拖入 IDA 并按下 F5 得到主要代码 主要逻辑非常简单,首先输入 len 个字符,len 点击去可以看到是 30. 然后对输入每一位进行变换,其中当索引值是 3 的倍数时输入值就减 31,当索引值除 3 余 1 时,输入值加 41,索引值除 3 余 2 时,输入值与 0x55 进行异或。 最后将变换之后...
Simple Encryption 伪加密 FSCTF{Wei_Ji@mi_s0_EasY} 萧河 补个png文件头 改高 FSCTF{xiaojia_xiaohe} base套 行不行啊细狗 底下还有 doEs_not_re@d_t 改zip看document 三段拼起来 FSCTF{N0t_A_heRo_doEs_not_re@d_tHe_3_Kinggggdoms} 小试牛刀 文件尾有 jphs隐写 FSCTF{huang_duduanwangu} 为...
通过字频解密网址,再加上猜测官方的提示(flag的格式都是:DASCTF{*答案*}),得到: 结果的第一个:dasc tfws this is a simple encryption good luck wo,就是答案,我们提取有效字符,即this is a simple encryption good luck即为最终的flag。 总结 以上就是第一道CTF题目的解题过程和思路,可以发现这里面涉及众多...
关于前端加密的分析过程可参阅jsEncrypter开发者c0ny1的文章:https://gv7.me/articles/2018/fast-locate-the-front-end-encryption-method/ 八、补充阅读 对单加密参数的登录接口进行密码爆破的一种方法,ExecJS模块使用由于软件开发的复杂性,诸如多层嵌套加密、引入时间变量、动态密钥、魔改加密算法、新算法的涌现,插件...
得到flag为aliyunctf{6a52d70da780cfe7f7218897535a4f61},进行验证。 字节码芭蕾/Bytecode Ballet 本题主要考察选手对定制化v8引擎的逆向分析及面对非标准JavaScript字节码时的逆向分析能力。旨在让参赛选手了解v8中字节码的实现,并针对非标准JavaScript字节码时编写对应的分析工具。
当脚本能成功运行时,检测到ELF头文件,转存为ELF二进制文件。经过很长时间的运行,最终得到falg: r10@kali:~/tisc$ python exploit6.py [+] Opening connection to fqybysahpvift1nqtwywevlr7n50zdzp.ctf.sg on port 42000: Done [*] Got address of index 38: 0x7ffca01db940 [*] RSP (index 0): ...
These areEnigmaencryptionsettings: M3 – model3 B– reflector type I,IV,V–rotortypes and order J,T,V – rotors initial value 1,1,1– rotors ring setting We usedCyberChefto decode the flag. Flag:JFKJR UIAWX MVDZW YGKNC MLTGK JDXSE ...
SoSimple on Proving Grounds March 2nd 2023 Topics: I had a lot of fun going through this WordPress based CTF. SoSimple Walkthrough SunsetMidnight on Proving Grounds February 26th 2023 Topics: This was my first intermediate level CTF on the Proving Grounds platform which thankfully didn't se...
pyvmmonitor pyvmmonitor PyVmMonitor is a profiler with a simple goal: being the best way to profile a Python program. library collection single_file_libs A large collection of useful single file include libraries written for C/C++ dolphin sudolphin If your friend ever leaves their laptop unloc...