Level 2 - Email Header

Challenge

You have given a Message.eml

Hints

Check for authenticity of the email
Analyse DKIM-SIGNATURE in the email header
Decrypt the cipher using ROT13

Solution

Download the given .eml file

Check for the DKIM-SIGNATURE (A DKIM signature in an email header is a cryptographic stamp that verifies the authenticity of the email. Usually it uses rsa256 for encryption but here we used ROT13 weak cipher text for encryption)

  
DKIM-Signature: v=3D1; a=3Drot13; c=3Dsimple/simple;
  d=3Dtech=2Ecom; i=3D@tech=2Ecom; q=3Ddns/txt; s=3Dmain;
  t=3D169784749; x=3D17293849;
  h=3Dmime-version:from:to:subject:message-id:date;
  p=3Dmlc{Jrypbzrgbmlcurdhrfg_0012}

Decrypt the cipher using ROT13 to get the flag

Flag

zyp{Welcometozyphequest_0012}