Set 1 - Challenge 7

Original Challenge Description from matasano

AES in ECB mode

The Base64-encoded content in this file has been encrypted via AES-128 in ECB mode under the key

"YELLOW SUBMARINE".

(case-sensitive, without the quotes; exactly 16 characters; I like "YELLOW SUBMARINE" because it's exactly 16 bytes long, and now you do too).

Decrypt it. You know the key, after all.

Easiest way: use OpenSSL::Cipher and give it AES-128-ECB as the cipher.

Do this with code.

You can obviously decrypt this using the OpenSSL command-line tool, but we're having you get ECB working in code for a reason. You'll need it a lot later on, and not just for attacking ECB.

My Solution

• OK, I'm going to incur some technical debt here is the way to decrypt using openssl.

Having said that I know in python or java  its probably going to take a few lines of code to do this once your using a crypto library.  I will try to spend sometime figuring out how to do this in C.

Please let me know if you can recommend any in C library.   or are we supposed to write our own AES program ?