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If I understand correctly, you are using ADF to load data from your source to sink and your data is encrypted, and you want to decrypt it while loading data. Please correct me if I am wrong.
Azure Data factory don't have any support of encryption and decryption in built. So, you need consider writing your own code in Azure functions or batch services and run them to perform your encryption and decryptions.
Please check below links to understand about Azure functions and batch services.
You can consider using Azure function activity or custom activity in Azure data factory to run the same as part of your pipeline.
Hope this helps.
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