Would be nice if a truecrypt volume residing on a remote network drive (like dropbox or similar) was accessible from a cellphone.

Even better, if Opera's bookmarks could be made to reside on such a truecrypt volume, that would be better than Opera Link as no one but the user would know the truecrypt password.

Maybe a web-based solution for all this or similar?

Is that asking for too much?

truecrypt phone - Google Search returns several promising hits.

But do you really want volume encryption? Wouldn't file-based encryption like encfs/ecrypts be more useful? - It would allow individual files to be encrypted rather than having to reserve large space for an extra volume.

Not sure that web access to a truecrypt volume is a meaningful concept. How would that be different from https?

Indeed. How is transparent file-level encryption done on a phone, with files that reside on a remote server? Can j2me java do it?

With https the plaintext would be visible to the remote server owners. An encrypted file residing on the remote server that you decrypt at the phone is more private.

Good point, but the way I understand truecrypt you have to decrypt the volume where it is mounted. You don't have remote file-level access to it. How would the web server know which bytes to return if it doesn't decrypt the volume? (And if it does, admins on the server can see it.) Unless you download the entire volume. And upload the entire volume when you change 1 byte. There goes your 500MB per month data allowance.

What you are talking about is file-level encryption like encfs.

Did you look at any of those search results? cryptonite looks like exactly what you want - try it out. Unfortunately I don't have space for it on my phone atm.

Downloading and uploading the entire volume is what I was thinking of, bookmarks would only need a tiny volume of a MB or two. But being able to deal with larger files or a large number of files would be nice too. Hence the preference for file-level encryption as you suggested. But it's got to be transparent like truecrypt.

Cryptonite seems just right. Except I do not see the source code for it. That would be a major plus.

Is there any reason mobile java applications cannot do the same?

encfs is transparent, too. The only hassle is that (last time I looked, anyway) windows support is pretty patchy.

Well, the first result in the search I suggested is cryptonite - EncFS and TrueCrypt on Android - Google Project Hosting - at code.google.com. In the "Source" tab you can browse the entire git repository.

Thanks.

Is anyone aware of java (j2me) encryption where the storage can be remote and the encryption/decryption is done at the phone, and it is done transparently?