Once the file leaves IBMi, there's not a lot you can do (without support from the bank). If the bank supports signed (or encrypted/signed) files, that would work.
FWIW, here's my process:
--Copy PF to stream file
--Encrypt/sign stream file
--FTPS directly from IBMi
Our bank doesn't talk about the FTPS option, but they have it if you press them.
From: Gad Miron [mailto:gadmiron@xxxxxxxxx]
Sent: Wednesday, August 16, 2017 12:28 AM
Subject: Secured txt file
Need advice with the following:
I'm asked to create on the i a "payment instructions" text file to be sent to our bank.
The actual uploading of the file to the bank is done by a special secured *PC based* software.
When testing the process someone pointed to me the need to prevent any user (i user or domain user) from changing the content of this text file.
I can create a txt file on the IFS and deny i users access to it (using
BUT when the file is copied from the IFS to the user's PC in order to send it to the bank then the access restrictions on the i are no longer valid.
I guess it is worth mentioning that we do not use SSO (Single sign on) for accessing the i
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