Skip to main content

Generating Digital Certificates

Generating Digital Certificates



: X. 509 Certificate Format
: Generate a public private key pair and       define identity

Two Options

Use a Certificate Authority

Generate signature request (csr)
Send csr to CA

Receive signature from CA
Self Signed Certificates

Sign your own public key

Currently, the Internet has standardized on a certificate format known as X. 509. The X. 509 format
associates a public key with an identity, and is generally only valid for a given time period. The identity can
be composed of arbitrary name value pairs, but is currently generally composed the following minimum set
Country, Province or State, Organization Name, Common Name, and Email.

The first step is to generate a public private key pair, which can be done with the openssl command
assuming a 1024bit key

openssi genrsa out servert. Key. pem 1024

Next, in order to generate a certificate signature request (csr) an identity must be established. The

following command will read in the generated key pair, prompt for identity information, and generate a
request

openssl req new key servert Key pem-out servert. csr. pem

The request wsuld then be sent to a Certificate Authority, who would (we hope) take additional steps to
verify the identity of the requester. The CA would then return to you a signed certificate, which could be
saved in a file sucH as server. crt. pem.

name of the output file
Alternatively a "self signed" certificate could be generated by using the x509 switch note the change in

openssl req new key servert Key pem out servert  crt pem x509

For a selfsignecl certificate, the owner is also the issuer. Such certificates are appropriate for root level or in situations where encryption is desired by authenticated identity is not necessary. In the spirit of
operi source, there are Certificate Authorities that do not r equire payment, like https caceft. ofg.
Red Hat provides a akefile to assist with the creation of certificates. From within the directory etc we may generate a self signed certificate by simply entering


Running make without a "target" or argument will display a usage statement.



OPenssH Overview 

: Replaces common insecure network     applications

: Provides user and token - based     authentication

: Capable of tunneling insecure protocols   through port forwarding

:System default configuration (client and   server) in  etc  ssh

:User configuration files in ssh

The OpenssH project provides supp ort for the secure shell protocol, a mechanism for providing secure
open ssh packages provide themselves, other packages, such as sync and rdist, can use secure shel
as their transport mechanism.
If a system does not need to provide remote shell access, but does need shell access to other hosts, then
askpass and open askpass gnome packages if you are running x. In order to provide remote ssh
access to other systems, install the openssh server RpM, which provides sshd. The openssh
askpass  packages are used in conjunction with ssh-agent in an X sessjon.


Below is a list of the RpM packages and what they provide. 

openssh : ssh keygen, scp

openssl : cryptographic libraries and routines required by openssh

openssh clients : ssh, slogin, ssh agent, ssh add, sftp

open ssh  server : sshd

open ssh  askpass : X11 passphrase dialog

open ssh askpass  gnome : GNOME passphrase dialog

Comments

Popular posts from this blog

Try winter cough cough Home remedies will run away from this country prescription without any medication Your cold cough

Try winter cough cough Home remedies will run away from this country prescription without any medication Your cold cough



 Friendly winter cough is a common problem in the winter season which is applicable to all people and if the winter season is going on right now then we are ten persons, three persons have this disease.
 And if we get a lot of colds or coughs this season, if we try to take medicine instead of a doctor, this can be relieved.

Let's have friends today what we know about this country remedy


The easiest and easiest way

 Put some salt in warm water and rinse with water. Relieves throat problems as well as drinking hot drinks like tea and coffee and yes, drinking warm water also helps.

 To relieve cold soreness and body aches or headaches
 Add turmeric powder ginger powder and a teaspoon of honey in a glass of warm water. This will provide a lot of relief.


 Native remedy for cold

 Friends find a steam machine in the market and if you want to buy a steam machine, boil hot water …

The DNS Hierarchy

The DNS Hierarchy



DNS is a directory of resource records organized as a tree resource record maps a name to data

klostname to IP address, domain to authoritative nameserver etc.

A domain is a collection of records in the same DNS subtree The root domain consists ol the whole DNS tree

The domain com consists only of names that end in .com hedhat .com is a subdomain of .com which in turn is a subdomain of

Ths part of a domain served by a particular nameserver is called the zone The nameserver is authoritative tor these names

The zone may cover an entire domain, or selected subdomains may be delegated to be served out as Separate zones by other nameservers

The fONOWing definitions are essential to understanding how DNS works Namesen any network device that is running a DNS server.

Resource Record an entry in a zone on the nameserver that maps one thing to anotherie. hostname to Ip address

Domain: a collection of resource records which end in a common name and represent an entire subtree of the DN…

These healthy tips on how to stay healthy in winter

These healthy tips on how to stay healthy in winter



 Eating different types of fruits in the winter improves the body's health by eating figs in winter strengthens bones

 Keeping body healthy in winter season should be taken care of different fresh vegetables and fruits in winter maintains health in our body.
 Winter fruits provide essential nutrients to our body by eating the fruits of winter benefits the body's mushroom tissues.

 Friends today we know what fruits should be eaten in the winter to keep our bodies healthy and which fruits to eat



Bananas
 By eating bananas every morning from 11 to 12 pm, blood pressure is in control of our body and also keeps the heart healthy.

Apples
 The dark circles under the eyes on our face become darker. If we eat apples in winter, it provides a great deal of relief, as well as eating apples every day, we can control our weight and keep skin cancer away.

Cranberry
 Half a cup of cranberries contains about 25 calories if needed.  Consuming it daily i…