B2B File to File Secure Transfer

Hi All,

Scenario: File to File (pass through) :Legacy File System to SAP PI (B2B),PI is used to connect with third party system as a B2B hub and places file in to ECC system.

Q1) How to fetch a file securely from third party system (multiple ways like SFTP etc...)

Q2) Whether PI File channel can decrypt the file if source has encrypted files? any other ideas in case source has encrypted file.

Regards,

Mani