Avantgarde Technologies

<a href="http://www.avantgardetechnologies.com.au">Avantgarde Technologies</a>
Perth's IT Experts

Thursday, December 22, 2011

Decrypting Network Packet Capture

There may be times where you need to view a network conversation which is encrypted with SSL. What do you do?

You may decrypt the conversation using a tool called "Network Monitor Decryption Expert" which is available for free from codeplex.

http://nmdecrypt.codeplex.com/

How do I go about decrypting the traffic?

Step 1

Start Microsoft Network Monitor (NetMon) and capture the Traffic from Office 365. The latest version as of this writing is 3.4 which is available from http://www.microsoft.com/download/en/details.aspx?id=4865

Step 2

Export the Server Certificate with private key in to a PFX

Step 3

Install the Netmon expert for SSL

Step 4

Now you should be able to decrypt the encrypted traffic.

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