Public key infrastructure

The key pair consists of one public and one private key that are mathematically related. An individual who intends to communicate securely with others can distribute the public key but must keep the private key secret. Content encrypted by using one of the keys can be decrypted by using the other. Assume, for example, that Bob wants to send a secure email message to Alice.

Public key infrastructure

Digital Certificate For analogy, a certificate can be considered as the ID card issued to the person. A digital certificate does the same basic thing in the electronic world, but with one difference.

Digital Certificates are not only issued to people but they can be issued to computers, software packages or anything else that need to prove the identity in the electronic world. Digital certificates are based on the ITU standard X.

Public key infrastructure

Hence digital certificates are sometimes also referred to as X. Public key pertaining to the user client is stored in digital certificates by The Certification Authority CA along with other relevant information such as client information, expiration date, usage, issuer etc.

CA digitally signs this entire information and includes digital signature in the certificate. Successful validation assures that the public key given in the certificate belongs to Public key infrastructure person whose details are given in the certificate.

As shown in the illustration, the CA accepts the application from a client to certify his public key. The CA, after duly verifying identity of client, issues a digital certificate to that client. Certifying Authority CA As discussed above, the CA issues certificate to a client and assist other users to verify the certificate.

The CA takes responsibility for identifying correctly the identity of the client asking for a certificate to be issued, and ensures that the information contained within the certificate is correct and digitally signs it.

The CA then signs the certificate to prevent modification of the details contained in the certificate. There are two ways of achieving this. One is to publish certificates in the equivalent of an electronic telephone directory. The other is to send your certificate out to those people you think might need it by one means or another.

After revocation, CA maintains the list of all revoked certificate that is available to the environment.

Public key infrastructure - Wikipedia

Registration Authority RA CA may use a third-party Registration Authority RA to perform the necessary checks on the person or company requesting the certificate to confirm their identity.

The RA may appear to the client as a CA, but they do not actually sign the certificate that is issued. Certificate Management System CMS It is the management system through which certificates are published, temporarily or permanently suspended, renewed, or revoked. Certificate management systems do not normally delete certificates because it may be necessary to prove their status at a point in time, perhaps for legal reasons.

A CA along with associated RA runs certificate management systems to be able to track their responsibilities and liabilities. This method is generally not adopted. If an attacker gains access to the computer, he can easily gain access to private key. For this reason, a private key is stored on secure removable storage token access to which is protected through a password.

Different vendors often use different and sometimes proprietary storage formats for storing keys. For example, Entrust uses the proprietary. Hierarchy of CA With vast networks and requirements of global communications, it is practically not feasible to have only one trusted CA from whom all users obtain their certificates.

Public key infrastructure

Secondly, availability of only one CA may lead to difficulties if CA is compromised. In such case, the hierarchical certification model is of interest since it allows public key certificates to be used in environments where two communicating parties do not have trust relationships with the same CA.

Certificate authority CA hierarchies are reflected in certificate chains. A certificate chain traces a path of certificates from a branch in the hierarchy to the root of the hierarchy. Verifying a certificate chain is the process of ensuring that a specific certificate chain is valid, correctly signed, and trustworthy.

Verifier takes the certificate and validates by using public key of issuer.DoIT received certification in as a self-signed Public Key Infrastructure (PKI) Certificate Authority (CA) and Registration Authority (RA) following an independent audit and "root key" generation ceremony.

Public Key Infrastructure. The USPS operates a PKI to provide security for its electronic information. Security is achieved by using public key cryptography. The types of security services provided by a PKI are: Confidentiality - The transformation of data into a form unreadable by anyone without the proper key.

The public key infrastructure concept has evolved to help address this problem and others. A public key infrastructure (PKI) consists of software and hardware elements that a trusted third party can use to establish the integrity and ownership of a public key.

Jul 07,  · This video explains to you how PKI works to create a secure environment. The term PKI can be very confusing, even to a technologist, because it is used to mean several different things.

On the one hand PKI may mean the methods, technologies and techniques that together provide a secure infrastructure. On the other hand, PKI may mean the use of a public key and private key pair for authentication and proof of content.

By the end of it, you'll be able to discuss how public key infrastructure works, explain how public key infrastructure is used to secure systems, and discuss how public key infrastructure is better than using shared passwords.

A beginner's guide to Public Key Infrastructure - TechRepublic