Provide a way to encrypt or obfuscate blob names
My application stores a lot of files containing user data, where each blob is named after a corresponding primary-key in a relational database.
Currently my blob storage container is private and all requests for blobs are proxied through my web application.
To reduce server load I would like to expose the blobs directly, however this would mean exposing the raw blob name to end-users, which gives away the unencrypted database primary-key value.
I know I can prevent access to blobs using Shared Access Signatures however I don't need that kind of security - I just want to obfuscate blob names - such as through simple symmetric encryption.
Supposing I have a blob at `/tenants/12/users/456/photos/1563445` then it should be possible to access it using `/VW4uTy7Dtn91TMO4Li5nfi91w693w79Sw4nDvsK/ZnhDJjrDjGguayouw55mwpguZi41w7fDki7CscOsXy4=` (which is a base64-encoded representation of an encrypted version of the original blob name, using a symmetric key and fixed IV).
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