quackme up

Reversing - 350 points

Challenge

The duck puns continue. Can you crack, I mean quack this program as well? You can find the program in /problems/quackme-up_0_740a9bce2dc2d486c687b9d3a6835d73 on the shell server.

Solution

Notice that the ciphertext is not dependent on the position of the char.

We're moving along swimmingly. Is this one too fowl for you?
Enter text to encrypt: a 
Here's your ciphertext: 00
Now quack it! : 11 80 20 E0 22 53 72 A1 01 41 55 20 A0 C0 25 E3 20 30 00 45 05 35 40 65 C1
That's all folks.

We're moving along swimmingly. Is this one too fowl for you?
Enter text to encrypt: b
Here's your ciphertext: 30
Now quack it! : 11 80 20 E0 22 53 72 A1 01 41 55 20 A0 C0 25 E3 20 30 00 45 05 35 40 65 C1
That's all folks.

We're moving along swimmingly. Is this one too fowl for you?
Enter text to encrypt: abcd
Here's your ciphertext: 00 30 20 50
Now quack it! : 11 80 20 E0 22 53 72 A1 01 41 55 20 A0 C0 25 E3 20 30 00 45 05 35 40 65 C1
That's all folks.

With this, let's just collect the ciphertext of all possible chars, then map it to the quack text

python solve.py

Flag

picoCTF{qu4ckm3_cba512e7}