Encryption can be used in FTP by either using the SFTP or FTPS protocol instead of the insecure FTP. This would mean that the FTP login information containing the username and password can be captured by a packet sniffer when FTP client software initiates a connection to an FTP server. FTP is well known to be insecure because the data is transferred in clear text which can be directly read from a packet sniffer. The FTP protocol has been around for quite a long time and is still commonly being used today to upload files to webservers.
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