Private albums are impossible because the platform is public? I think you're mistaken. A user could potentially post an album whose contents are encrypted. Sharing the encryption key would be the means to grant access to the album.
If each user had a public/private key pair, and published the public one as part of their account profile, the key to view the album could be encrypted with public key of each user to whom access should be granted. Those encrypted keys could be posted publicly for all to see, along with the encrypted album contents.
(I hope my ignorance of steem isn't showing and there's not some obvious technical limitation i'm missing... I'm new to steem, but in principle this seems reasonable - i mean, if you can post pictures and text, why couldn't you post encrypted pictures and text?)
Steem is not built as file manager, and sharing keys would COMPROMISE platform seriously. There is no "Reading Hash Password".
Public - Posts are meant for everyone to see. Privacy comes to each user individually not between each other in blockchain.
Or at least you should explain in more technical keys, because abrakadabra private key/post private album/share is just a magic, not a technical possibility of API yet.
Do you know what are file permissions on hosting ? How you will manage permissions with encryption if you not encrypt entire file (then it's not image anymore and requires decoding to not be encrypter (base64) which is consider serious security flaw.
Magento CMS because of it has hacks all the year and constantly needs to place some security patches/leaks.
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