It runs over SSH, and is currently documented inĭraft-ietf-secsh-filexfer-02 Public key file format ![]() The SFTP (SSH File Transfer Protocol) is probably the most widely used secure file transfer protocol today. RFC 4254 - The Secure Shell (SSH) Connection Protocol SFTP file transfer protocol RFC 4252 - The Secure Shell (SSH) Authentication Protocol RFC 4253 - The Secure Shell (SSH) Transport Layer Protocol RFC 4251 - The Secure Shell (SSH) Protocol Architecture It is now an internet standard that is described in the following documents: ![]() When the SSH protocol became popular, Tatu Ylonen took it to the IETF for standardization. IETF SSH standard and detailed technical documentation The core protocol The traffic between the communicating parties is protected with industry standard strong encryption algorithms (such as AES (Advanced Encryption Standard)), and the SSH protocol also includes a mechanism that ensures the integrity of the transmitted data by using standard hash algorithms (such as SHA-2 (Standard Hashing Algorithm)). During the negotiation the client and server agree on the symmetric encryption algorithm to be used and generate the encryption key that will be used. ![]() Once a connection has been established between the SSH client and server, the data that is transmitted is encrypted according to the parameters negotiated in the setup. SSH provides strong encryption and integrity protection We provide services and tools for implementing SSH key management. Traditional identity management projects have overlooked as much as 90% of all credentials by ignoring SSH keys. Ensuring proper policies, processes, and audits also for SSH usage is critical for proper identity and access management. In some cases we have found several million SSH keys authorizing access into production servers in customer environments, with 90% of the keys actually being unused and representing access that was provisioned but never terminated. They require a similar provisioning and termination processes. SSH keys grant access as user names and passwords do. We have found that large organizations have way more SSH keys than they imagine, and managing SSH keys has become very important. Automated secure shell file transfers are used to seamlessly integrate applications and also for automated systems & configuration management. The main use of key-based authentication is to enable secure automation. Public key authentication is also used with smartcards, such as the CAC and PIV cards used by US government. The keys used for authentication are called SSH keys. The idea is to have a cryptographic key pair - public key and private key - and configure the public key on a server to authorize access and grant anyone who has a copy of the private key access to the server. ![]() It has turned out to be much more widely used than we ever anticipated. The public key authentication method is primarily used for automation and sometimes by system administrators for single sign-on. The most common ones are passwords and public key authentication. There are several options that can be used for user authentication. The figure below presents a simplified setup flow of a secure shell connection. After the setup phase the SSH protocol uses strong symmetric encryption and hashing algorithms to ensure the privacy and integrity of the data that is exchanged between the client and server. The SSH client drives the connection setup process and uses public key cryptography to verify the identity of the SSH server. The protocol works in the client-server model, which means that the connection is established by the SSH client connecting to the SSH server. Managing network infrastructure and other mission-critical system components. Providing secure access for users and automated processes The protocol is used in corporate networks for: Contents Typical uses of the SSH protocol How does the SSH protocol work Strong authentication with SSH keys SSH provides strong encryption and integrity protection IETF SSH standard and detailed technical documentation The core protocol SFTP file transfer protocol Public key file format How to Cite SSH Typical uses of the SSH protocol
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