Explain the importance of p2p encryption

doc/overview.md

@@ -14,7 +14,24 @@ Equihash (200,9) (ASIC)
 
 ## P2P
 
-TLS1.3 via WolfSSL is enforced for all network connections as of v3.6.1
+TLS1.3 via WolfSSL is enforced for all network connections as of v3.6.1 .
+Many ciphersuites are technically supported by TLS1.3 but many of them
+are ancient, proved to be less secure than intended or likely backdoored.
+Hush only uses what are widely considered to be the most secure and [best ciphersuites](https://ciphersuite.info/cs/).
+
+New Hush P2P connections randomly choose between these two ciphersuites each
+time a new connection to a peer is created:
+
+  * `TLS_AES_256_GCM_SHA384`
+  * `TLS_CHACHA20_POLY1305_SHA256`
+
+Encrypted P2P connections are important because it means passive network spies,
+such as ISPs, cannot tell what nodes are communicating to each other and also
+prevents certain attacks against privacy at the network level, such as looking
+for which node was the first to relay a transaction. Bitcoin has no protection
+against this which is why it's trivial for network spies to tell which node
+(and hence which IP address) created a certain transaction and hence which
+IP address owns which addresses.
 
 ## RPC