Difference between sshv1 and 1.5?

– SSHv1 vs SSHv1.5
+ SSHv1 (Secure Shell version 1) was released in 1995 by Tatu Ylönen, while SSHv1.5 (Secure Shell version 1.5) was released in 1996. The main difference between the two is that SSHv1.5 introduced several new features and improvements over SSHv1.
+ SSHv1 used DES encryption for data transfer, while SSHv1.5 introduced Blowfish encryption as an alternative to DES. Blowfish encryption is more secure than DES, making SSHv1.5 a more secure protocol than SSHv1.
+ SSHv1 had no support for public key authentication, while SSHv1.5 introduced support for public key authentication using RSA and DSA algorithms. Public key authentication provides an additional layer of security by allowing users to authenticate themselves without revealing their passwords.
+ SSHv1 had a limited number of authentication methods, while SSHv1.5 introduced several new authentication methods, including challenge-response authentication and host-based authentication.
+ SSHv1 did not support port forwarding, while SSHv1.5 introduced support for local and remote port forwarding. Port forwarding allows users to securely access resources on remote networks through an SSH connection.
+ SSHv1 had a limited number of configuration options, while SSHv1.5 introduced several new configuration options, including the ability to customize the behavior of various features such as compression and TCP keepalives.

Conclusion

+ In summary, SSHv1.5 is a more secure and feature-rich protocol than SSHv1. It introduced several new features and improvements over SSHv1, including Blowfish encryption, public key authentication, port forwarding, and additional configuration options. As a result, it is recommended that users upgrade from SSHv1 to SSHv1.5 or a later version to take advantage of these improvements and enhance their security posture.

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