A major problem with using ICMP is that you&#x27;ll &quot;stand out like a turd in a punch bowl!&quot; (apologies to the movie Up the Academy).<p>ICMP is used for a limited number of very specific things. If you appropriate it for more general use, your traffic will stand out. Look at me! Look at me! Look at me! If you&#x27;re using crypto, I think rule #1 should be to blend in, to <i>not</i> call extra attention to yourself.<p>I&#x27;d rather start my communication by sending a TCP packet to port 443. Just like billions of TCP sessions start every day. That doesn&#x27;t help you if someone is specifically targeting you, but it <i>might</i> keep you from being noticed initially.