Use wget to download the Python file.

A short description from Wikipedia: GNU Wget (or just Wget, formerly Geturl, also written as its package name, wget) is a computer program that retrieves content from web servers. It is part of the GNU Project. Its name derives from "World Wide Web" and "get". It supports downloading via HTTP, HTTPS, and FTP.

This challenge is extremely easy. You use wget to download the file and then run the script using Python.

If you want to learn more about wget, then in the terminal type the following.

man wget
wget https://artifacts.picoctf.net/c/34/runme.py

A short description from Wikipedia: GNU Wget (or just Wget, formerly Geturl, also written as its package name, wget) is a computer program that retrieves content from web servers. It is part of the GNU Project. Its name derives from "World Wide Web" and "get". It supports downloading via HTTP, HTTPS, and FTP.

python3 runme.py

That's all.

First, download the file and use the following command to see it's contents.

cat values

That in turn, returns the following output.

Decrypt my super sick RSA:
c: 8533139361076999596208540806559574687666062896040360148742851107661304651861689
n: 769457290801263793712740792519696786147248001937382943813345728685422050738403253
e: 65537

We are being presented with the following description "Cryptography can be easy, do you know what ROT13 is?" and the following text.

cvpbPGS[arkg_gvzr_V'yy_gel_2_ebhaqf_bs_ebg13_Ncualgvd]

This is a cipher text, meaning that the letters of the alphabet need to be 'moved' 13 places forward, in order to decrypt the message.

Download the python script, pw.txt and flag.txt.en.

cat pw.txt
cat flag.txt.en

python3 ende.py -d flag.txt.en

Enter the password of pw.txt and you get the flag.

First, download all the files provided. They are the following. All of them are needed to live in the same directory in order for this to work.

level5.py
level5.flag.txt.enc
level5.hash.bin
dictionary.txt

Now let's open up the main file which is the level5.py

First, download all the files provided. They are the following. All of them are needed to live in the same directory in order for this to work.

level4.py
level4.flag.txt.enc
level4.hash.bin

Now let's open up the main file which is the level4.py

First, download all the files provided. They are the following. All of them are needed to live in the same directory in order for this to work.

level3.py
level3.flag.txt.enc
level3.hash.bin

Now let's open up the main file which is the level3.py

First, download both the files and store them in the same directory.level2.py and level2.flag.txt.enc

Then use the following command in the terminal to see the contents of the file.

nano level2.py

First, dowload both the files in store them in the same directory. (level1.py and level1.flag.txt.enc).

Open up the level1.py using your favorite editor or with the following command from the terminal.

nano level1.py

### THIS FUNCTION WILL NOT HELP YOU FIND THE FLAG --LT ########################
def str_xor(secret, key):
    #extend key to secret length
    new_key = key
    i = 0
    while len(new_key) < len(secret):
        new_key = new_key + key[i]
        i = (i + 1) % len(key)        
    return "".join([chr(ord(secret_c) ^ ord(new_key_c)) for (secret_c,new_key_c) in zip(secret,new_key)])
###############################################################################

flag_enc = open('level1.flag.txt.enc', 'rb').read()

def level_1_pw_check():
    user_pw = input("Please enter correct password for flag: ")
    if( user_pw == "1e1a"):
        print("Welcome back... your flag, user:")
        decryption = str_xor(flag_enc.decode(), user_pw)
        print(decryption)
        return
    print("That password is incorrect")

level_1_pw_check()