update docs

docs/encryption.md

@@ -19,19 +19,20 @@ deviceKey='F5u42Bd3HyW8KxkUqo2gRA'
 # push payload
 json='{"body": "test", "sound": "birdsong"}'
 
-# must be 16 bit long
+# Must be 16 bit long
 key='1234567890123456'
-iv='1111111111111111'
+# IV can be randomly generated, but if it is random, it needs to be passed in the iv parameter.
+iv='1234567890123456'
 
 # openssl requires Hex encoding of manual keys and IVs, not ASCII encoding.
 key=$(printf $key | xxd -ps -c 200)
 iv=$(printf $iv | xxd -ps -c 200)
 
 ciphertext=$(echo -n $json | openssl enc -aes-128-cbc -K $key -iv $iv | base64)
 
-# The console will print "d3QhjQjP5majvNt5CjsvFWwqqj2gKl96RFj5OO+u6ynTt7lkyigDYNA3abnnCLpr"
+# The console will print "+aPt5cwN9GbTLLSFri60l3h1X00u/9j1FENfWiTxhNHVLGU+XoJ15JJG5W/d/yf0"
 echo $ciphertext
 
 # URL encoding the ciphertext, there may be special characters.
-curl --data-urlencode "ciphertext=$ciphertext" http://api.day.app/$deviceKey
+curl --data-urlencode "ciphertext=$ciphertext" --data-urlencode "iv=1234567890123456" https://api.day.app/$deviceKey
 ```