For an ssh connection to work, which of the following need to be true check all that apply
The SSH protocol supports many authentication methods. Arguably one the most important of these is Public Key authentication for interactive and automated connections. The motivation for using public key authentication over simple passwords is security. Public key authentication provides cryptographic strength that even extremely long passwords can not offer. With SSH, public key authentication improves security considerably as it frees the users from remembering complicated passwords (or worse yet, writing them down). In addition to security
public key authentication also offers usability benefits - it allows users to implement single sign-on across the SSH servers they connect to. Public key authentication also allows automated, passwordless login that is a key enabler for the countless secure automation processes that execute within enterprise networks globally. Public key
cryptography revolves around a couple of key concepts. The sections below explain these briefly. As with any encryption scheme, public key authentication is based on an algorithm. There are several well-researched, secure, and trustworthy algorithms out there - the most common being the likes of RSA and DSA. Unlike the commonly
known (symmetric or secret-key) encryption algorithms the public key encryption algorithms work with two separate keys. These two keys form a pair that is specific to each user. Key Pair - Public and PrivateIn the SSH public key authentication use case, it is rather typical that the users create (i.e. provision) the key pair for themselves. SSH implementations include easily usable utilities for this (for more information see ssh-keygen and ssh-copy-id). Each SSH key pair includes two keys:
Setting Up Public Key Authentication for SSHThe following simple steps are required to set up public key authentication (for SSH):
Handling of the Private KeyIt is extremely important that the privacy of the private key is guarded carefully. For most user-driven use cases this is accomplished by encrypting the private key with a passphrase. When a private key is needed the user is asked to supply the passphrase so that the private key can be decrypted. The handling of passphrases can be automated with an SSH agent. In most automated use cases (scripts, applications, etc) the private keys are not protected and careful planning and key management practises need to be excercised to remain secure and compliant with regulatory mandates. From Chaos to Order - SSH Key ManagementIn environments where users are free to self-provision authentication keys it is common that over the years the numbers of provisioned and deployed keys grow very large. Since there is no way to find out who owns or has originally provisioned a given public key found on a server, and since these keys never expire, the true state of access control in large unmanaged environments can be very unclear or outright chaotic. Managing and controlling access to servers and other IT infrastructure is a legal requirement for any enterprise that operates on regulated markets such as finance, energy, healthcare, or commerce. These enterprises need to employ solutions for SSH key management to control the access granted by SSH keys. How does SSH connection work?SSH encrypts and authenticates all connections. SSH provides IT and information security (infosec) professionals with a secure mechanism to manage SSH clients remotely. Rather than requiring password authentication to initialize a connection between an SSH client and server, SSH authenticates the devices themselves.
What is an SSH client?An SSH client is a program that allows establishing secure and authenticated SSH connections to SSH servers. SSH client software is available for major enterprise environment operating systems, such as Unix variations, Microsoft Windows and IBM z/OS.
Is SSH secure over the Internet?SSH provides secure login, file transfer, X11, and TCP/IP connections over an untrusted network. It uses cryptographic authentication, automatic session encryption, and integrity protection for transferred data.
|