This web page is around the protocol. For the company behind it, check out interactions Security. For using the Linux command, view command usage. For clients, servers, and also technical information, check out (Secure Shell) house page.

You are watching: Select the secure alternative to the telnet protocol:

The protocol (also referred to as for sure Shell) is a technique for secure far login from one computer system to another. It provides several alternate options for strong authentication, and it protects the interactions security and also integrity with solid encryption. The is a secure alternate to the non-protected login protocols (such as telnet, rlogin) and insecure file transfer methods (such as FTP).


Typical uses of the protocol just how does the protocol work solid authentication v tricks provides strong encryption and integrity protection IETF standard and detailed technical documentation The main point protocol SFTP record transfer protocol windy key file format how to cite

Typical provides of the protocol

The protocol is supplied in that company networks for:

providing secure access for users and also automated processes

interactive and automated file transfers

issuing far commands

managing network infrastructure and also other mission-critical device components.


How walk the protocol work

The protocol functions in the client-server model, which way that the connection is created by the customer connecting come the server. The customer drives the link setup procedure and supplies public an essential cryptography to verify the identification of the server. ~ the setup phase the protocol uses strong symmetric encryption and also hashing algorithms to ensure the privacy and integrity the the data the is exchanged between the client and server.

The figure listed below presents a streamlined setup flow of a secure covering connection.


Strong authentication v keys

There are several options that have the right to be offered for user authentication. The most usual ones room passwords and also public key authentication.

The public key authentication an approach is mostly used for automation and sometimes by system administrators for solitary sign-on. It has actually turned the end to be much much more widely provided than we ever before anticipated. The idea is to have actually a cryptographic an essential pair - public an essential and private key - and configure the public crucial on a server to authorize accessibility and approve anyone who has a copy of the private an essential access to the server. The tricks used because that authentication are referred to as keys. Public crucial authentication is likewise used v smartcards, such as the CAC and PIV cards supplied by united state government.

The key use that key-based authentication is to enable secure automation. Automated certain shell document transfers are provided to seamlessly combine applications and additionally for automated equipment & construction management.

We have discovered that huge organizations have method more secrets than lock imagine, and managing keys has actually become really important. secrets grant accessibility as user names and also passwords do. They call for a comparable provisioning and termination processes.

In some instances we have discovered several million secrets authorizing accessibility into production servers in customer environments, through 90% that the keys actually gift unused and also representing access that was provisioned yet never terminated. Ensuring ideal policies, processes, and also audits also for intake is crucial for appropriate identity and accessibility management. Traditional identity management projects have actually overlooked as much as 90% of all credentials by ignoring keys. We administer services and also tools because that implementing vital management. provides strong encryption and integrity protection

Once a connection has been established in between the client and server, the data the is sent is encrypted according to the parameters negotiated in the setup. Throughout the negotiation the customer and server agree on the symmetric encryption algorithm to it is in used and also generate the encryption an essential that will be used. The traffic in between the communicating parties is defended with market standard strong encryption algorithms (such as AES (Advanced Encryption Standard)), and also the protocol likewise includes a mechanism that ensures the verity of thetransfer data through using typical hash algorithms (such as SHA-2 (Standard Hashing Algorithm)).

IETF standard and detailed technical documentation

The core protocol

When the protocol came to be popular, Tatu Ylonen take it it to the IETF for standardization. It is now an net standard that is described in the adhering to documents:

RFC 4251 - The Secure shell ( Protocol Architecture

RFC 4253 - The Secure shell ( move Layer Protocol

RFC 4252 - The Secure covering ( Authentication Protocol

RFC 4254 - The Secure covering ( connection Protocol

SFTP record transfer protocol

The SFTP ( record Transfer Protocol) is most likely the many widely used secure file transfer protocol today. It runs over, and is at this time documented in


Public key record format

The windy key file format is no a formal traditional (it is an informational document), but many implementations support this format.

See more: Places To Eat, Shop & Play On 14Th St &Amp; Curtis St Denver Colorado 80202

RFC 4716 - The Secure covering ( public Key paper Format

How to mention

To point out in a research paper, please usage the following:

Tatu Ylonen: - for sure Login connections over the Internet.Proceedings of the 6th USENIX security Symposium, pp. 37-42, USENIX, 1996.