PicoCTF — endianness, repetitions, useless

endianness

Author: Nana Ama Atombo-Sackey
Description
Know of little and big endian? Source

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Here, we got a file named file.c

>> nc titan.picoctf.net 58415

So, I took the help of hints to check what can I do of the words after checking the C File.
Hint — 1 : You might want to check the ASCII table to first find the hexadecimal representation of characters before finding the endianness.

It took me a bit of a time to understand because I wasn’t familar with the concept of endianness. I basically converted the ASCII to hex and then applied the Little Endian Method i.e. to revert the hex code received and then for Big Endian Method, I just wrote the same hex value.

I received the flag as : picoCTF{3ndi4n_sw4p_su33ess_02999450}

repetitions

Author: Theoneste Byagutangaza
Description
Can you make sense of this file? Download the file here.

We have got a file named enc_flag. As first glance it looks like an encoded file, let’s see what happens.

I tried all the combination on the website : https://gchq.github.io/CyberChef/

First I tried a lot of combinations and stuff like SHA2, MD5, Base64 but then I just the == in the end and hence it was confirmed that it was a Base64 String but on multiple tries I didn’t find any questions and closed the CTF but when I re- read the title I tried to use Base64 again and again and found the flag.

The flag is : picoCTF{base64_n3st3d_dic0d!n8_d0wnl04d3d_dfe803c6}

useless

Author: Loic Shema
Description
There’s an interesting script in the user’s home directory

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The work computer is running SSH. We’ve been given a script which performs some basic calculations, explore the script and find a flag.

Hostname: saturn.picoctf.net
Port: 58911
Username: picoplayer
Password: password

First, we will gain access to the user using SSH by the command : ssh -p 58911 picoplayer@saturn.picoctf.net

The code basically told us to Read the manual, so I wrote the command: man <filename>

And boom I easily got the flag : picoCTF{us3l3ss_ch4ll3ng3_3xpl0it3d_4151}

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