1. Certification authority (CA)
2. Revocation
3. Registration Authority (RA)
4. Certificate publishing methods
5. Certificate Management System
6. 'PKI aware' applications
I'm not certain of the intent of the question but it sounds like what is being asked is how you can know the actual identity of someone from their public key - i.e. how you can know that the public key really belongs to the person it purports to belong to. PKI (public key infrastructure) is one way to establish with reasonable certainty that a key really belongs to the entity that is claimed. PKI uses a system of Certificate Authorities (CA) and Registration Authorities (RA). At the top of the chain is the Registration Authority that everyone trusts. Users register their public keys with the RA. CA's also register their certificates withe the RA along with proof that they are who they say they are. CA's are repositories of public keys that the public can access. They sign the keys with their own certificates vouching for the identity of the public key owner. The identity of the CA may, in turn, be vouched for by an RA or higher CA who sign the certificate of that particular CA.
This is known as RSA encryption. Encryption involving a public and private key combination is known as asynchronous cryptography, as opposed to synchronous cryptography. It is also known as public key cryptography. RSA is an algorithm that may be used (but there are others that can be used), in public key cryptography. (A key pair)
RSA decryption using a public key involves the recipient using the public key provided by the sender to decrypt the encrypted message. The recipient uses the public key to raise the ciphertext to the power of the public exponent, and then takes the result modulo the public modulus to obtain the original plaintext message.
Public key cryptography always works the same way: Encryption is done with the public key, decryption done with the private key. It is not possible to decrypt anything with the public key (otherwise the whole system would crash down). The only time it's done the other way is for message authentication, where only a digest of a message is encrypted and can be verified (not decrypted) using the public key.
The public key concerning the CAC refers to the authorized key that is open to all the concerned people. The encryption procedure ranges according to the key.
Public Key Infrastructure certificatesPublic key infrastructure certificates (PKI)
Chodes!
Chodes!
It stands for Public Key Infrastructure. It has to do with security and data encryption.
PKI or Public Key Infrastructure
certificate authority
One can receive a PKI certificate, or a public-key infrastructure certificate, is by digitally signing and publishing the public key bound to a given user.
The concept of a public key infrastructure is quite complicated. It is basically a combination of hardware, software, policies, procedures and people which combined together manage a digital certificate. It is explained in some detail on Wikipedia.
PKI (Public-key Infrastructure)
Public Key Infrastructure (PKI) in an integrated system of software, encryption methodologies, protocols, legal agreements, and third-party services that enables users to communicate securely an protect information assets.
Certificate Server (CS)
Public Key Infrastructure (PKI) operates by using a combination of hardware, software, policies, and procedures to manage digital certificates and public-key encryption. It involves a trusted Certificate Authority (CA) that issues digital certificates to verify the identity of entities, allowing secure communication. Users generate a pair of keys: a public key, which is shared widely, and a private key, kept secret. PKI ensures the integrity, authentication, and non-repudiation of data through cryptographic techniques, enabling secure transactions over unsecured networks.