Uploading code to dev or production server using ftp or using telnet, are they both not safe?

To answer briefly, anyone on the path of the packets from your pc to the server. In some cases (insecure networks, wireless networks, and so on) many more persons. That's because the password will travel in plain text You can see more about packet sniffing at en.wikipedia.org/wiki/Packet_capture Also check en.wikipedia.org/wiki/File_Transfer_Prot....

To answer briefly, anyone on the path of the packets from your pc to the server. In some cases (insecure networks, wireless networks, and so on) many more persons. That's because the password will travel in plain text.

You can see more about packet sniffing at en.wikipedia.org/wiki/Packet_capture. Also check en.wikipedia.org/wiki/File_Transfer_Prot....

Both ftp and telnet are unencrypted. That means that anyone who can capture your internet traffic (e.g. Your isp, hosting provider, maybe government) can read your password in plain text averytime you login. Ssh and sftp/scp will encrypt your password and none should be able to read it.

Yes, by using a simple packet sniffer, such as Wireshark it is possible to read the plaintext passwords used by telnet and ftp. Try using this tool while initializing a ftp or telnet session and you'll see how non-secure these mechanisms are. As tagged with this post, ssh and sftp are more secure alternatives as they encrypt the data as it moves across the wire.

And, as always, never use these sorts of tools for evil!

Anyone with a sniffer can see it. Use the secure equivalents i.e. SFTP and SSH instead.

They are protected with strong encryption and everything will be encrypted.

Thanks. Please see update if possible. – 動靜能針 May 27 '09 at 5:41.

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