in app (Java) crypt "file store"/ media cache ?

[таракан]

> Surely failing to cache such things is a needless deficiency which
> would be called a bug by most user's?

I wouldn't call that a bug... caching is very,very error-prone and as I said inherently a security problem. In other area than computation, AI, etc...  caching is generally used for multimedia applications. I consider it as a stupid technique in such area. Sensitive things should never be cached...