We have just implemented a solution for such a transfer. We are required to secure all data transfers internal or external. For z/OS to Unix to Linux we use FTP over System SSL on the z/OS side, lftp and proftp on Unix / Linux respectively. For Windows, our shop did not change to use a server that understands SSL/TLS, they use SSHTectia as an ftp server. For z/OS to Windows, the z/OS side uses OpenSSH/sftp from IBM's Ported Tools. The downside to this is the requirement to copy files in/out of USS as sftp doesn't understand MVS dataset formats. It's extra JCL and disk. There are other tools such as Dovetail's dspipes to help with this copying but we are not using them. The sftp requires pub/private key exchange with the id's performing the transfer. ssh-keygen is supported both on the Windows and z/OS-USS platforms.
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