If you prefer closed-source code (that you can't review), you are free to buy one of commercial libraries for encryption. Unfortunately I didn't get what you mean by "we are revealing the sensitive information with open world". Yes, it's possible to use zipped files - I would again use a .NET library (some APIs are already in the standard .NET framework). Nevertheless if you wanted to use PGP, why do you now want to give it up and use symmetric encryption instead (as you description seems to suggest)? Note that you can encrypt even ZIP files with PGP.
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