2019-04-25から1日間の記事一覧

ångstromCTF Crypto Really Secure Algorithm

Really Secure Algorithm I found this flag somewhere when I was taking a walk, but it seems to have been encrypted with this Really Secure Algorithm! 以下のテキストファイルが与えられる。 p = 8337989838551614633430029371803892077156162494012…

ångstromCTF Crypto Classy Cipher

Classy Cipher Every CTF starts off with a Caesar cipher, but we're more classy. pythonのソースコードが与えられる。 from secret import flag, shift def encrypt(d, s): e = '' for c in d: e += chr((ord(c)+s) % 0xff) return e assert encrypt(fla…

ångstromCTF Writeup Misc

Misc IRC Description We have an IRC channel, #angstromctf on freenode! Join us to ask questions, have fun, and get a flag. IRCに入るとフラグがある。 FLAG : actf{like_discord_but_worse} The Mueller Report Description The redacted version of…

ångstromCTF Reversing High Quality Checks

High Quality Checks After two break-ins to his shell server, kmh got super paranoid about a third! He's so paranoid that he abandoned the traditional password storage method and came up with this monstrosity! I reckon he used the flag as t…

ångstromCTF Binary Chain of Rope

Chain of Rope defund found out about this cool new dark web browser! While he was browsing the dark web he came across this service that sells rope chains on the black market, but they're super overpriced! He managed to get the source code…

ångstromCTF Reversing One Bite

Reversing One Bite Whenever I have friends over, I love to brag about things that I can eat in a single bite. Can you give this program a tasty flag that fits the bill? /problems/2019/one_bite Author: SirIan 実行ファイルが与えられる。 rada…

ångstromCTF Binary Aquarium

Binary Aquarium Here's a nice little program that helps you manage your fish tank. Run it on the shell server at /problems/2019/aquarium/ or connect with nc shell.actf.co 19305. Author: kmh11 ソースコードと実行ファイルが与えられる。 #inclu…