Crypto Chall - HackMD

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# Crypto Chall - Cipher ``` 0. Missouri Encryption Standard (MES) 1. Algorithm 13 2. Algorithm MCCCXXXVII 3. Algorithm X (Pronounced Algorithm 10) ``` - q's address: `0x55555558efa0` ``` 0x55555558eea0 0x0000000000000000 0x0000000000000091 ................ 0x55555558eeb0 0x7320657361656c50 0x2061207463656c65 Please select a 0x55555558eec0 0x72636e652077656e 0x61206e6f69747079 new encryption a 0x55555558eed0 0x6d687469726f676c 0x20646461206f7420 lgorithm to add 0x55555558eee0 0x2072756f79206f74 0x697463656c6c6f63 to your collecti 0x55555558eef0 0x202e756f002e6e6f 0x6f77206863696857 on..ou. Which wo 0x55555558ef00 0x20756f7920646c75 0x003f726566657270 uld you prefer?. 0x55555558ef10 0x756f792073656761 0x7720657261687320 ages you share w 0x55555558ef20 0x6569726620687469 0x0000000a2e73646e ith friends..... 0x55555558ef30 0x0000000000000000 0x0000000000000071 ........q....... 0x55555558ef40 0x000055555558ef50 0x000000000000000a P.XUUU.......... 0x55555558ef50 0x4b20657461657243 0x0000000000007965 Create Key...... 0x55555558ef60 0x000055555558ef70 0x000000000000000f p.XUUU.......... 0x55555558ef70 0x2074707972636e45 0x006567617373654d Encrypt Message. 0x55555558ef80 0x000055555558ef90 0x000000000000000f ..XUUU.......... 0x55555558ef90 0x2074707972636544 0x006567617373654d Decrypt Message. 0x55555558efa0 0x0000000000000000 0x0000000000000411 ................ 0x55555558efb0 0x3463633137320a30 0x3139303732643534 0.271cc445d27091 0x55555558efc0 0x3334313966373334 0x00000000000a3963 437f9143c9...... 0x55555558efd0 0x0000000000000000 0x0000000000000000 ................ 0x55555558efe0 0x0000000000000000 0x0000000000000000 ................ 0x55555558eff0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f000 0x0000000000000000 0x0000000000000000 ................ 0x55555558f010 0x0000000000000000 0x0000000000000000 ................ 0x55555558f020 0x0000000000000000 0x0000000000000000 ................ 0x55555558f030 0x0000000000000000 0x0000000000000000 ................ 0x55555558f040 0x0000000000000000 0x0000000000000000 ................ 0x55555558f050 0x0000000000000000 0x0000000000000000 ................ 0x55555558f060 0x0000000000000000 0x0000000000000000 ................ 0x55555558f070 0x0000000000000000 0x0000000000000000 ................ 0x55555558f080 0x0000000000000000 0x0000000000000000 ................ 0x55555558f090 0x0000000000000000 0x0000000000000000 ................ 0x55555558f0a0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f0b0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f0c0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f0d0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f0e0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f0f0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f100 0x0000000000000000 0x0000000000000000 ................ 0x55555558f110 0x0000000000000000 0x0000000000000000 ................ 0x55555558f120 0x0000000000000000 0x0000000000000000 ................ 0x55555558f130 0x0000000000000000 0x0000000000000000 ................ 0x55555558f140 0x0000000000000000 0x0000000000000000 ................ 0x55555558f150 0x0000000000000000 0x0000000000000000 ................ 0x55555558f160 0x0000000000000000 0x0000000000000000 ................ 0x55555558f170 0x0000000000000000 0x0000000000000000 ................ 0x55555558f180 0x0000000000000000 0x0000000000000000 ................ 0x55555558f190 0x0000000000000000 0x0000000000000000 ................ 0x55555558f1a0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f1b0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f1c0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f1d0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f1e0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f1f0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f200 0x0000000000000000 0x0000000000000000 ................ 0x55555558f210 0x0000000000000000 0x0000000000000000 ................ 0x55555558f220 0x0000000000000000 0x0000000000000000 ................ 0x55555558f230 0x0000000000000000 0x0000000000000000 ................ 0x55555558f240 0x0000000000000000 0x0000000000000000 ................ 0x55555558f250 0x0000000000000000 0x0000000000000000 ................ 0x55555558f260 0x0000000000000000 0x0000000000000000 ................ 0x55555558f270 0x0000000000000000 0x0000000000000000 ................ 0x55555558f280 0x0000000000000000 0x0000000000000000 ................ 0x55555558f290 0x0000000000000000 0x0000000000000000 ................ 0x55555558f2a0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f2b0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f2c0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f2d0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f2e0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f2f0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f300 0x0000000000000000 0x0000000000000000 ................ 0x55555558f310 0x0000000000000000 0x0000000000000000 ................ 0x55555558f320 0x0000000000000000 0x0000000000000000 ................ 0x55555558f330 0x0000000000000000 0x0000000000000000 ................ 0x55555558f340 0x0000000000000000 0x0000000000000000 ................ 0x55555558f350 0x0000000000000000 0x0000000000000000 ................ 0x55555558f360 0x0000000000000000 0x0000000000000000 ................ 0x55555558f370 0x0000000000000000 0x0000000000000000 ................ 0x55555558f380 0x0000000000000000 0x0000000000000000 ................ 0x55555558f390 0x0000000000000000 0x0000000000000000 ................ 0x55555558f3a0 0x0000000000000000 0x0000000000000000 ................ 0x55555558f3b0 0x0000000000000000 0x0000000000000031 ........1....... 0x55555558f3c0 0x6972756f7373694d 0x74707972636e4520 Missouri Encrypt 0x55555558f3d0 0x6e617453206e6f69 0x454d282064726164 ion Standard (ME 0x55555558f3e0 0x0037333134002953 0x0000000000000021 S).4137.!....... 0x55555558f3f0 0x687469726f676c41 0x58584343434d206d Algorithm MCCCXX 0x55555558f400 0x0000000049495658 0x0000000000000031 XVII....1....... 0x55555558f410 0x687469726f676c41 0x6f7250282058206d Algorithm X (Pro 0x55555558f420 0x206465636e756f6e 0x687469726f676c41 nounced Algorith 0x55555558f430 0x000000293031206d 0x0000000000000091 m 10)........... 0x55555558f440 0x000055555558f3c0 0x0000000000000022 ..XUUU.."....... 0x55555558f450 0x0000000000000022 0x0000000000000000 "............... 0x55555558f460 0x000055555558f470 0x000000000000000c p.XUUU.......... 0x55555558f470 0x687469726f676c41 0x000000003331206d Algorithm 13.... 0x55555558f480 0x000055555558f3f0 0x0000000000000014 ..XUUU.......... 0x55555558f490 0x0000000000000014 0x0000000000000000 ................ 0x55555558f4a0 0x000055555558fb90 0x0000000000000025 ..XUUU..%....... 0x55555558f4b0 0x0000000000000025 0x0000000000000000 %............... 0x55555558f4c0 0x0000000000000000 0x0000000000000031 ........1....... 0x55555558f4d0 0x6972756f7373694d 0x74707972636e4520 Missouri Encrypt 0x55555558f4e0 0x6e617453206e6f69 0x454d282064726164 ion Standard (ME 0x55555558f4f0 0x0000002930002953 ``` ``` 0x55555557d000 0x0000000000000000 0x0000000000000291 ................ 0x55555557d010 0x0000000100030003 0x0001000000020000 ................ 0x55555557d020 0x0000000000000000 0x0000000000000000 ................ 0x55555557d030 0x0000000000000000 0x0000000000000000 ................ 0x55555557d040 0x0000000000000000 0x0001000000000000 ................ 0x55555557d050 0x0000000000000000 0x0000000000000000 ................ 0x55555557d060 0x0000000000000000 0x0000000000000000 ................ 0x55555557d070 0x0000000000000000 0x0000000000000000 ................ 0x55555557d080 0x0000000000000000 0x0000000000000000 ................ 0x55555557d090 0x000055555558faf0 0x000055555558fb10 ..XUUU....XUUU.. 0x55555557d0a0 0x000055555558fab0 0x0000000000000000 ..XUUU.......... 0x55555557d0b0 0x0000000000000000 0x000055555558f6e0 ..........XUUU.. 0x55555557d0c0 0x0000000000000000 0x000055555558f440 ........@.XUUU.. 0x55555557d0d0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d0e0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d0f0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d100 0x0000000000000000 0x0000000000000000 ................ 0x55555557d110 0x0000000000000000 0x0000000000000000 ................ 0x55555557d120 0x0000000000000000 0x0000000000000000 ................ 0x55555557d130 0x0000000000000000 0x0000000000000000 ................ 0x55555557d140 0x0000000000000000 0x0000000000000000 ................ 0x55555557d150 0x0000000000000000 0x0000000000000000 ................ 0x55555557d160 0x0000000000000000 0x0000000000000000 ................ 0x55555557d170 0x0000000000000000 0x0000000000000000 ................ 0x55555557d180 0x0000000000000000 0x000055555558f8a0 ..........XUUU.. 0x55555557d190 0x0000000000000000 0x0000000000000000 ................ 0x55555557d1a0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d1b0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d1c0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d1d0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d1e0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d1f0 0x0000000000000000 0x0000000000000000 ................ 0x55555557d200 0x0000000000000000 0x0000000000000000 ................ 0x55555557d210 0x0000000000000000 0x0000000000000000 ................ 0x55555557d220 0x0000000000000000 0x0000000000000000 ................ 0x55555557d230 0x0000000000000000 0x0000000000000000 ................ 0x55555557d240 0x0000000000000000 0x0000000000000000 ................ 0x55555557d250 0x0000000000000000 0x0000000000000000 ................ 0x55555557d260 0x0000000000000000 0x0000000000000000 ................ 0x55555557d270 0x0000000000000000 0x0000000000000000 ................ 0x55555557d280 0x0000000000000000 0x0000000000000000 ............... ``` ## 参考文献 - [C++のpwn/revで使うSTLコンテナの構造とバグパターン一覧 - CTFするぞ](https://ptr-yudai.hatenablog.com/entry/2021/11/30/235732) - [Memory Layout of C++ Object in Different Scenarios](http://www.vishalchovatiya.com/memory-layout-of-cpp-object/) - [Harekaze mini CTF 2020 write-up](https://qiita.com/kusano_k/items/de8947497630383ddf2a)

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