PicoCTF — ASCII Numbers, Binary Search, Blame Game

ASCII Numbers

Author: LT ‘syreal’ Jones
Description
Convert the following string of ASCII numbers into a readable string: 0x70 0x69 0x63 0x6f 0x43 0x54 0x46 0x7b 0x34 0x35 0x63 0x31 0x31 0x5f 0x6e 0x30 0x5f 0x71 0x75 0x33 0x35 0x37 0x31 0x30 0x6e 0x35 0x5f 0x31 0x6c 0x6c 0x5f 0x74 0x33 0x31 0x31 0x5f 0x79 0x33 0x5f 0x6e 0x30 0x5f 0x6c 0x31 0x33 0x35 0x5f 0x34 0x34 0x35 0x64 0x34 0x31 0x38 0x30 0x7d

Then answer of the flag is : picoCTF{45c11_n0_qu35710n5_1ll_t311_y3_n0_l135_445d4180}

Binary Search

Author: Jeffery John
Description
Want to play a game? As you use more of the shell, you might be interested in how they work! Binary search is a classic algorithm used to quickly find an item in a sorted list. Can you find the flag? You’ll have 1000 possibilities and only 10 guesses. Cyber security often has a huge amount of data to look through — from logs, vulnerability reports, and forensics. Practicing the fundamentals manually might help you in the future when you have to write your own tools! You can download the challenge files here:

challenge.zip

Additional details will be available after launching your challenge instance.

It was a basic Binary Search Algorithm question and I just tried to lower down the range of possibilities of answer and the found the answer as : 116

The flag was : picoCTF{g00d_gu355_3af33d18}

Blame Game

Author: Jeffery John
Description
Someone’s commits seems to be preventing the program from working. Who is it? You can download the challenge files here:

challenge.zip

Hint — 1 : In collaborative projects, many users can make many changes. How can you see the changes within one file?

It was an easy flag but I didn’t read the Log file very clearly. So the flag lies in the Log file as the Name of the person who committed the changes in the file.

The flag was : picoCTF{@sk_th3_1nt3rn_2c6bf174}

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