Which protocol or measure should be used to mitigate the vulnerability of using FTP to transfer documents between a teleworker and the company file server?
- SCP
- TFTP
- ACLs on the file server
- out-of-band communication channel
Explanation: File transfer using FTP is transmitted in plain text. The username and password would be easily captured if the data transmission is intercepted. Secure Copy Protocol (SCP) conducts the authentication and file transfer under SSH, thus the communication is encrypted. Like FTP, TFTP transfers files unencrypted. ACLs provide network traffic filtering but not encryption. Using an out-of-band communication channel (OOB) either requires physical access to the file server or, if done through the internet, does not necessarily encrypt the communication.
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