01. 2Warm

Can you convert the number 42 (base 10) to binary (base 2)?
將 10 進位表示的 42 轉換為 2 進位

WRITEUP:

簡易的數值轉換，使用線上轉換器 即可解出。

ANSWER:

picoCTF{101010}

Unnamed at times, at times unknow
Our graves lie thick beyond the seas
Unnamed, but not of Him unknow
He knows
He sees

「A?」
「Yes. I’m here.」
「Who’s “they”? Who put me in here?」
「AWe don’t know what they call themselves. We code-named them the Nameless. after a poem on their servers, the first hint of who they are we ever found.」
「The Nameless. They own this factory?」
「The own the means to unlock it.」
「The flags.」
「They’ve hidden them cleverly on their servers.」
「That’s why I’m hacking them.」
「They will do everything they can to stop you. Tread carefully, Sky.」

02. bases

What does this bDNhcm5fdGgzX3IwcDM1 mean? I think it has something to do with bases.
解開字串 “bDNhcm5fdGgzX3IwcDM1”所代表的意義，看起來與某種 base 有關...

WRITEUP:

在資料轉換中不只有數字的進位轉換，在網路、加密學等等各方面也有將文字轉換的必要，
base64 加密過後的特徵是使用 a-z, A-Z, 0-9 加上+ / 共64個符號組成。使用線上工具 即可解出。

參考:

base64

ANSWER:

picoCTF{l3arn_th3_r0p35}