For instance, to preserve confidentiality during transmission, SFTP provides data-in-motion encryption. The various algorithms used for this purpose are called ciphers. To perform data integrity checks and discover possible modifications in the data, SFTP uses what are known as Message Authentication Codes or MACs.

Does SFTP use a stream cipher?

Secure file transfer protocols like SFTP, FTPS, HTTPS, and WebDAVS encrypt data through symmetric key ciphers. These ciphers can be classified into two groups: stream ciphers and block ciphers.

How do I know which cipher is SFTP using?

You can verify this using the FTP Logon activity. Select SFTP for connection type. Select Custom for cipher(s) selection. You can then check the drop down listings for encryption, MAC, key-exchange, and public key algorithms.