Challenges published by Xer0Day

"a language where the programs are works of modern art’’ A police unit intercepted a message from a terrorist group. This mes...

The validation password was encrypted using this public key. ``` ciphertext : e8oQDihsmkvjT3sZe+EE8lwNvBEsFegYF6+OOFOiR6gMt...

Decrypt the captured network exchange between the client and the server (source code provided)....

Check out my SECURITY PATCH for mmap(). despite no-ASLR setting, it will randomize memory layout. so it will contribute for ex...

I made a skeleton interface for one time password authentication system. I guess there are no mistakes. could you take a look ...

Pwn this echo service. Running at : nc pwnable.kr 9010...

Pwn this RSA calculator service. its lame, but it also supports some encryption/decryption. ``` Running at : nc pwnable.kr ...

Pwn this echo service. Running at : nc pwnable.kr 9011...

We often need to make 'printable-ascii-only' exploit payload. You wanna try? hint : you don't necessarily have to jump at th...

I made a new system call for Linux kernel. It converts lowercase letters to upper case letters. would you like to see the impl...

This is a simple CRC calculator for kernel module programming exercise. I bet there are no bugs. but you can check it if you ...

I made a simple brain-fuck language emulation program written in C. The [ ] commands are not implemented yet. However the rest...

I don't think this is exploitable bug. do you agree? (task is patched. unintended easy solutions will not work from now :P) ...

I made a simple brain-fuck language emulation program written in C. The [ ] commands are not implemented yet. However the rest...

We made a simple MD5 calculator as a network service. Find a bug and exploit it to get a shell. hint : this service shares t...