The standard used by Cisco is X.509, an ITU-T standard for a public key infrastructure (PKI) and Privilege Management Infrastructure (PMI). X.509 specifies, amongst other things, standard formats for public key certificates, certificate revocation lists, attribute certificates. How to create self-signed certificates An article by Fabio Semperboni Tutorial A digital certificate or identity certificate is an electronic document which uses a digital signature to bind a public key with an identity, information such as the name of a person or an organization, their address, and so forth. Most modern Cisco routers support SSH, so this shouldn’t be a problem. Products with (K9) in the image name e.g c2900-universal k9 -mz.SPA.154-3.M2.bin, support strong encryption with 3DES/AES while (K8) IOS bundles support weak encryption with the outdated DES. Oct 16, 2019  Using privacy-enhanced mail (PEM)-formatted files to import or export RSA keys can be helpful for customers who are running Cisco IOS software Release 12.3(4)T or later and who are using secure socket layer (SSL) or secure shell (SSH) applications to manually generate RSA key pairs and import the keys back into their PKI applications. How I create RSA key and enable SSH access in Cisco VG202, in a Cisco router I use the next commands(but in a VG not exists): conf t. Crypto key generate rsa.

A digital certificate or identity certificate is an electronic document which uses a digital signature to bind a public key with an identity, information such as the name of a person or an organization, their address, and so forth. The certificate can be used to verify that a public key belongs to an individual.

In a typical public key infrastructure (PKI) scheme, the signature will be of a certificate authority (CA). However, there are situations where it is not possible use a CA, so the only solutions is to use a self-signed certificate, an identity certificate that is signed by the same entity whose identity it certifies.

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The standard used by Cisco is X.509, an ITU-T standard for a public key infrastructure (PKI) and Privilege Management Infrastructure (PMI). X.509 specifies, amongst other things, standard formats for public key certificates, certificate revocation lists, attribute certificates, and a certification path validation algorithm.

The most common use of certificates is for HTTPS-based web sites. A web browser validates that an SSL web server is authentic, so that the user can feel secure that his/her interaction with the web site has no eavesdroppers and that the web site is who it claims to be. Other uses are VPN lan2lan, GetVPN and so on.

There are two different approaches to create a self-signed certificate: automatic or manual.

To automatically create an rsa key pairs and a certificate, enable the https server:

Where is the certificate?

Remember: Save the configuration to save the certificate!

The second method requires three steps: create an rsa key pairs, create a self signed trust point and enroll the certificate.

Create an RSA keys:

Create a local PKI:

Remembers: The “subject-name” is the name of the entity whose public key the certificate identifies. For instance, “O” identify the “Organization” and “CN” the Common name

Obtain the certificate from the local certificate authority:

Remember: You must save the configuration to save the certificate!

To see more information about the certificates and the rsa keys are, you can use these commands:

• show crypto pki certificates
• show crypto pki trustpoints
• show crypto key mypubkey rsa

References:

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You can access Cisco ASA appliance using Command Line Interface (CLI) using either Telnet or SSH and for web-based graphical management using HTTPS (ASDM) management. Telnet uses TCP port 23 and is not secure. Secure Shell (SSH) on the other hand uses port 22 and is secure. SSH uses public key cryptography to authenticate remote user. You can configure SSH access in Cisco ASA device using the steps shown here.

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Configure SSH Access in Cisco ASA

Step 1: Configure Enable password. (Optional)

Step 2: Create a username with password.

Step 3: Configure this local username to authenticate with SSH.

Step 4:/cyberghost-vpn-premium-key-generator-2015.html. Create RSA key pair.

Step 5: Now specify only particular hosts or network to connect to the device using SSH.

You can now access the device using SSH from 192.168.1.0 and 172.16.1.0 network.

In this way you can configure remote SSH access in Cisco ASA appliance.

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