[CGamesPlay]

Include the password in the URL fragment like mega.co.nz does.

I built something similar actually, you might want to look at it:

Source: https://github.com/CGamesPlay/ipfs-fileshare

Published version: https://ipfs.io/ipfs/QmaP8v2wzJjbcvnhkJRaecCrHDGAQdYHcr6MH3Y...

Example encrypted file: https://ipfs.io/ipfs/QmaP8v2wzJjbcvnhkJRaecCrHDGAQdYHcr6MH3Y...

(I wrote this a while ago and it doesn't seem to be working at the moment :-/)