The current node doesn’t allow to decrypt the items.
The option to crypt and decrypt can be useful when you have to store sensitive data and you would like to protect them, but you have also the option to unencrypt them if needed for future processing.
Hey @Skywrath-Mage,
Don’t forget to hit the vote button to make it count.
I think a better request would be to introduce some encryption options though the current crypto node is hashing values which is a one way process (unless you have rainbow tables or a lot of time) so it wouldn’t be something that can be introduced.
Has this feature or node been released yet?
Also would love this. I hvave set up Encryption using the Crypto node and then discovered that there’s no Decryption.
I think there’s a higher probability that we here on this thread are doing it wrong, than the possibility that decryption was forgotten during the design of the Crypto node.
Can someone shed light here? 
This has been added and is available from n8n@2.22.0