[jyl]

I'm looking for an online secure file transfer service, to send documents back and forth between self and clients, without having to encrypt each document and convey the password.

Typical use case is, I send Mrs. Jones a document in PDF, Mrs. Jones prints the document, signs it, scans it, and sends the signed document in PDF back to me. The document contains sensitive information like SSNs and account data, so regular email is not good. I could encrypt it and call Mrs. Jones with a password, she is fine with entering passwords, but Mrs. Jones has no idea how to encrypt the signed document on her end.

I want to be able to send Mrs. Jones a link to the document, that she accesses with a password, then when she's ready to send the document back to me, she uploads it to the service which sends me a link, and I retrieve and download it using a password.

There are plenty of services like this - but I want to know which ones you guys use and recommend?