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Re:A Message About Vanguard From Our Security and Privacy Teams by ds on Saturday April 18, 2020 @09:58AM (#22907758)
That heavy lifting wasnt done by myself so I unfortunately dont have a answer for you. This was around a decade ago however, so I would not be surprised if the traffic was unencrypted.
Re:A Message About Vanguard From Our Security and Privacy Teams by XMPPwocky on Saturday April 18, 2020 @01:29PM (#22909327)
Source did not encrypt network traffic until DeepBlueSea released NetShark for CS:GO.

Now it uses ICE, a 64-bit block cipher from the DES era. The key is obtained from the Steam servers over the normal Steam encrypted channel.