Permissions for retrieving String

[wklausing]

Hello,

I have questions regarding the permission feature. Is it possible to give someone only permission to show a secret to another person? So, Alice has a secret for Bob, and Bob is only allowed to grant retrieval to Charlie. But Bob is not allowed to alter the secret, only Alice is allowed to do that. 



I guess, I would need Alice to create the secret and Bob needs to have a Nada program which can be used to retrieve the secret? So Alice grants permission to compute and Bob grants permission to Charlie to retrieve the secret by using the Nada program. Would that work? To make things harder, the secret is a String. To me it seems that Strings are not supported by Nada currently or am I mistaken here?