Encryption over Database Link

We have a requirement that we create database links to a database at an external site. The network will be public, meaning we need to ensure all communication across said network needs to be encrypted.

We have no control over the destination database, we are passing SQL to the destination database and pulling back results, but need to make sure that all transmissions across the link will be encrypted (not just user authentication).

The local databases will be 10.2.0.4 on AIX and 11.2.0.4 on Linux. The destination database will be 11.2.0.3 on AIX. All are Enterprise Edition. I've read through some of the documentation for Advanced Security, and we do have some licenses available, so if that's the best solution, we can implement it at the local databases, but destination database will not have Advanced Security installed, so any solutions that require it on both sides would not work.

Additionally (and most obviously), we want to avoid any changes to the code utilizing these links, so any suggestions creating views on top of tables using DBMS_CRYPTO to encrypt and then decrypt at the local database won't work. We really just need to implement a secure way to transfer packets been the two sites.

Thanks,
Scott
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