![]() Once accepted, this key will be stored within the client, which will then be used to check if the Host key matches each time it connects to the SFTP server. ![]() When the client connects to the server, the server’s public key is returned and the client may be prompted to accept the host key (if connecting for the first time). Host key validation ensures the FTP server that a client is connecting to is verified as the correct one. It is designed to protect against man-in-the-middle attacks where the hacker intercepts and relays an impersonated message to the other party. Ensuring the SFTP server is validated is an important aspect of the SFTP protocol. Validation of the Server Public (Host) KeyĪ host key is the SFTP server’s public key. The server’s private key is only used internally by the SFTP server/server admin and is not used by end-users. The server’s public key (commonly known as the host key) is sent to connecting clients for validation and ensure the SFTP server they are connecting to is the correct server. The user’s private key is kept secret and stored locally on the user’s PC while the user’s public key is uploaded and registered on the SFTP server the user connects to. ![]() The user’s Public & Private Keys are a pair of keys used to authenticate a client when it connects to an SFTP server. ![]() In SSH, there are two sets of public/private key pairs (or four keys), which are: SSH in SFTP Servers is an encrypted network protocol that uses public key cryptography to create a more secure method to authenticate a client’s identity and rights to access a server. Note that SyncBackFree and SyncBackSE do not support SFTP, and while SyncBackSE supports the FTPS protocol, it is unrelated to SFTP. To transfer files securely using SFTP, you will need to use a client that supports the Secure Shell (SSH) protocol, like the PC backup & synchronization program - SyncBackPro. In addition, we will be discussing how a connecting client can check to ensure the SFTP server is authentic. This article discusses the basics of what SFTP is and the various authenticating methods in which a user can use to connect to an SFTP server (depending on how the server is set up). SFTP Authentication Author: Conrad Chung, 2BrightSparks Pte.
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May 2023
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