ZOC is a professional SSH/SSH2/telnet client and terminal emulator.
Functions like tabbed sessions, thumbnail overview, typed command history, scroll back, multiple window support and a wide range of emulations make it the preferred tool for people who access Unix shell accounts from a Windows or Mac OS X platform. Linux administrators will feel like sitting on their native console with ZOC's support for colors, meta-keys and local printing. It is also the essential tool for those who work with the Cisco CLI.
In addition to the above, ZOC features widely used terminal emulations like Xterm, vt102, vt220 and several types of Ansi and not so widely used ones like TN3270, TN5250, Wyse, TVI and Sun's CDE. ZOC also supports major file transfer protocols like X-, Y- and Zmodem as well as Kermit and SCP. All these are offered in solid implementations which leave nothing to be desired.
ZOC Terminal is a product developed by Emtec Innovative Software. This site is not directly affiliated with Emtec Innovative Software. All trademarks, registered trademarks, product names and company names or logos mentioned herein are the property of their respective owners.
Jun 16, 2020 ZOC is a professional telnet or Secure Shell (SSH) client and terminal emulator that consolidates connectivity to all your text based servers and remote gear under one roof. ZOC is a professional ssh client and terminal emulator. With its impressive list of emulations and features, it is a reliable and elegant tool that connects you to hosts and mainframes via secure shell, telnet, serial cable and other methods of communication. With its modern user interface, this terminal has many ways of making your life easier.
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Yes! The free ZOC Terminal download for PC works on most current Windows operating systems.
Or, as RFC 4253 states in its intro:
This document describes the SSH transport layer protocol, which typically runs on top of TCP/IP. [..].
Key exchange method, public key algorithm, symmetric encryption algorithm, message authentication algorithm, and hash algorithm are all negotiated.
This document also describes the Diffie-Hellman key exchange method and the minimal set of algorithms that are needed to implement the SSH transport layer protocol.
The RFC defines ways to create an encryption key (that later serves to encrypt the traffic between client and server) in the possible presence of a listener. It also definesw host and user authentication methods (i.e. ways in which users and server can prove that they are who they claim to be), and possible data compression to more effectively transmit data.An especially challenging part of encrypting such communication, is the need to negotiation a shared secret (an encryptino key) over a channel that might already be monitored. SSH answers this challenge through the initial key exchange phase of the connection using the older Diffie-Hellman kex method. Never versions now also support ED25519 elliptic curve kex. It is a specific implementation of the Edwards-curve Digital Signature Algorithm (EdDSA), which itself is a variant of Schnorr's signature system with Twisted Edwards curves (math heavy details can be found in the upcoming IETF standard for ED25519).
Symmetric encryption usually requires little computing power and is hence used to encrypt larger blocks of data. With SSH, it is used to encrypt the whole data stream.
Asymmetrical encryption differs from symmetrical encryption in the fact that two different keys are used. One (any) of those two is used to encrypt the data and then the other is used to decrypt it. The benefit of this technique is that one party can give the other party a key to encrypt messages to you, but anyone knowing that key will still not be able to decrypt the message again. Such a key is called the public key. The other key, which is not shared and which is then used to decrypt the data block is called the private key.
This also works in the other direction. Data that was encrypted using the private key can only be decrypted using the public key. With SSH this fact can be used to prove identity. If a message is decryptable using the public key, it proves that whoever encrypted the message, is in possession of the private key.
Public/private key pairs are generated using the ssh-keygen tool or ZOC's built in key generator.
Think of the problem as such: You need to agree with someone else on a password, but you can only talk to each other about it over a phone line which you know could be tapped by the enemy.
SSH answers this challenge through the initial key exchange phase of the connection using the older Diffie-Hellman kex method. Newer versions now also support ED25519 elliptic curve kex. It is a specific implementation of the Edwards-curve Digital Signature Algorithm (EdDSA), which itself is a variant of Schnorr's signature system with Twisted Edwards curves (math heavy details can be found in the upcoming IETF standard for ED25519.
Static port-forwarding (or tunneling) refers to situations where the desitination host and port are known in advance.
Tunnelblick for mac el capitan. Programs and protocols which do not use data encrpytion (e.g. ftp or rsh) can connect to the tunnel's port on the local computer and the ssh client will transmit their data through the encrypted ssh connection to/from a final destination that is already known at the time when the ssh-connection is made.
For example, a user can set up a port-forwarding on the client software, listening on the client port 5514 and forwarding traffic to the address of an older device with a fixed IP address on the remote network that only supports the unencrypted rsh protocol.
As outlined above, static port-forwarding feature requires the client to set up the tunnel source port and destination before making the connection.
This problem is addressed by secure shell's dynamic port forwarding. With dynamic port forwarding, the client sets up a listening port (as with normal port fowarding), where a software that connects to the port can tell the client which host and port it wants to connect to. This is done in the same way that client software can request connections from a SOCK5 proxy.
The ssh client will then forward the connection request to the secure shell server which makes the connection to the destination host. This way, the ssh client could let an unencrypted rsh software access arbitrary rsh servers on the remote network through the encrypted data channel.
This may seem surprising, but it makes perfect sense. Keep in mind that if somebody were able to control any part of the communication path, they could actually reroute the traffic to another computer. This could then play the role of the computer which you actually wanted to connect to (this is called a man-in-the-middle attack), and could either display fake data or obtain information from the client computer. A feature called known_hosts can prevent this.
The SSH terminal should also support a variety of authentication methods. These include username/password, public/private key, and various custom formats. The latter might include a system where the server could obtain information that only the authorized users know, e.g. by using a SecurID card or by sending an access code to the user's mobile phone.
Most server continually switch to more advanced encryption methods, ssh clients need to support these as well.
Other typical must have features for would be:
SSH Connection via Proxy
In some environments, end user computers are not allowed to access the outside internet directly. In those cases, connection and data exchange is made by way of a ssh proxy which handles the actual connection to the outside network (internet).
X11 Forwarding
X11 is a communication protocol which allows a remote computer to run programs with a graphical user interface on a remote computer. SSH supports a way to tunnel this type of communication between ssh client, thus allowing the user to run X11 software on the server and see the ouput on his computer.