Hosted only, but the product I worked on in my last position:
https://www.nortonzone.com/learn-more

Data encrypted at rest. (AES256)
AES256 keys encrypted with PKI.

When you share to someone else's account, a copy of the AES256 key is encrypted with the recipients public key.

When you create a public link, a key pair is created for the link and the key used to encrypt the private key is embedded in the link, along with the object ID.

Enterprise version can link to the Symantec Encryption Management Server, so the PKI key pairs used are at rest on the enterprise network and not at Symantec.

Of course, if you want to run your own, there is open source:
http://owncloud.org/

On 05/03/14 08:03, Edward Ned Harvey (lopser) wrote:
Concept Blossom, Synctuary

One of the companies I work for, http://conceptblossom.com is doing a
promotional $1 per user per year, secure cloud file sharing solution.

For $0 and no registration, you get 3 users.  (That's not promotional -
that's ongoing steady state).  And during the promotion, it's $1 per
user after that.

We presently have only the client/server model available, in which the
data at-rest is not encrypted on the server (so it's a host-your-own
server model), but will be launching a client-side encryption feature
this summer, which will also enable us to offer a hosted solution.

I currently use this in the public cloud, and use TrueCrypt to secure
the data at-rest.  So if a public cloud solution is what you care about,
it *can* be done.  But until the client-side encryption feature is
available, the public cloud could be vulnerable in-runtime.

--
Mr. Flibble
King of the Potato People
http://www.linkedin.com/in/RobertLanning
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