The file transfer mechanism that is built into Dropbox is a variation of FTPS. The SSH system first establishes a secure link with the destination server and then the file transfer process uses that encryption to protect files in transit. SSH uses distributed keys for encryption. SFTP uses Secure Shell (SSH) for protection. So, RSA is used for authentication as well as for encryption. This enables FTPS to use the encryption system as a challenge to the correspondent to prove its identity.
It is impossible to derive the private key from the public key. This is the same system that protects HTTPS transmissions and it uses the asymmetric RSA encryption system. FTPS and SFTPįTPS uses Transport Layer Security (TLS) to protect the contents of your files while they are in transit. However, when you look further into possible FTP clients to use with the Dropbox FTP server, you are in for a surprise. You could encrypt your files before sending them but it is just easier to use an encrypted file transmission protocol. This is because FTP transfers files in plain text. When considering an FTP client for your transfers to the Dropbox FTP server, you really are looking at a secure system that deploys FTPS or SFTP for transmission control. The Dropbox file space is encrypted with a 256-bit key AES cipher.
Dropbox is a widely-used file server platform in the cloud and offers a good deal on secure remote storage space. You can access the Dropbox FTP server to upload and back up important files, such as log files and device configuration images.
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