Problem

After the connection is establish between partners ( using PESIT or SSL) is the data that is sent encrypted ?

Resolution

In a PeSIT SSL transfer, the file is encrypted (or not*) online, meaning during the transfer. (*depends of the cipher suites you are using).

It also means that the file is not encrypted on disk (sender and receiver side).

If the file sensitive and needs to be encrypted before the transfer, it should be done at application level.