Net::SFTP - Secure File Transfer Protocol client
Net::SFTP is a pure-Perl implementation of the Secure File Transfer Protocol (SFTP) - file transfer built on top of the SSH2 protocol. Net::SFTP uses Net::SSH::Perl to build a secure, encrypted tunnel through which files can be transferred and managed. It provides a subset of the commands listed in the SSH File Transfer Protocol IETF draft, which can be found at http://www.openssh.com/txt/draft-ietf-secsh-filexfer-00.txt.
SFTP stands for Secure File Transfer Protocol and is a method of transferring files between machines over a secure, encrypted connection (as opposed to regular FTP, which functions over an insecure connection). The security in SFTP comes through its integration with SSH, which provides an encrypted transport layer over which the SFTP commands are executed, and over which files can be transferred. The SFTP protocol defines a client and a server; only the client, not the server, is implemented in Net::SFTP.
Because it is built upon SSH, SFTP inherits all of the built-in functionality provided by Net::SSH::Perl: encrypted communications between client and server, multiple supported authentication methods (eg. password, public key, etc.).