WIP

yellow-paper/docs/logs/index.md

@@ -3,4 +3,18 @@ title: Logs
 ---
 
 Logs on Aztec are similar to logs on Ethereum and their goal is to allow smart contracts to communicate arbitrary data to the outside world.
-Logs are events which are emitted during contract function execution.
+Logs are events which are emitted during contract function execution.
+
+There are 2 kinds of logs in Aztec protocol: unencrypted and encrypted.
+
+## Unencrypted logs
+Unencrypted logs are used to communicate public information out of smart contracts.
+Unencrypted logs can be emitted from both public and private functions.
+
+:::info
+Emitting unencrypted logs from private functions can be a privacy leak but we decided to not forbid it because it might allow for interesting usecases like custom encryption schemes using FHE etc.
+:::
+
+## Encrypted logs
+Encrypted logs can be emitted only from private functions.
+This is because to encrypt the log we need to get a secret and it's impossible to privately manage secrets in public domain.