File Checker (rev60)
My friend sent me this file. He told that if I manage to reverse it, I’ll have access to all his devices. My misfortune that I don’t know anything about reversing :/
FlagStore (exp70)
Here’s the ultimate flag store. Store and retrieve your flags whenever you want.
It’s Prime Time! (code60)
Description: We all know that prime numbers are quite important in cryptography. Can you help me to find some?
Service: 188.166.133.53:11059
Running netcat against the address gave the following output:
> nc 188.166.133.53 11059 Hi, you know that prime numbers are important, don't you? Help me calculating the next prime! Level 1.: Find the next prime number after 5:
I haven’t done much work with Ruby, but this little challenge from the Internetwache CTF looked interesting.
Ruby’s count (exp50)
Description: Hi, my name is Ruby. I like converting characters into ascii values and then calculating the sum.
Service: 188.166.133.53:12037
The first thing to do was to poke the service using netcat:
> nc 188.166.133.53 12037
Let me count the ascii values of 10 characters:
> 123
WRONG!!!! Only 10 characters matching /^[a-f]{10}$/ !
A nice little Stego challenge from SharifCTF
We have hidden a message in png file using jar file. Flag is hidden message. Flag is in this format:
SharifCTF{flag}
Extracting the supplied tar.gz archive provided a PNG image:
Also included was Hide.jar, the Java code used to embed the flag in the image.