A third party asked a user to share a public key for secure communication. Which of the following file formats should the user choose to share the key?
CER files: CER file is used to store X.509 certificate. Normally used for SSL certification to verify and identify web servers security. The file contains information about certificate owner and public key. A CER file can be in binary (ASN.1 DER) or encoded with Base-64 with header and footer included (PEM), Windows will recognize either of these layout.
PVK files: Stands for Private Key. Windows uses PVK files to store private keys for code signing in various Microsoft products. PVK is proprietary format.
PFX files Personal Exchange Format, is a PKCS12 file. This contains a variety of cryptographic information, such as certificates, root authority certificates, certificate chains and private keys. It’s cryptographically protected with passwords to keep private keys private and preserve the integrity of the root certificates. The PFX file is also used in various Microsoft products, such as IIS.
The .cer file format is commonly used for sharing public keys. It stands for "Certificate" and is typically used to distribute X.509 digital certificates, which contain the public key and other relevant information. The .cer file format is widely supported and can be easily shared and imported into various systems and applications.
.pfx (option A) is a file format used for storing a private key along with its associated public key or certificate chain. .csr (option B) stands for "Certificate Signing Request" and is used to generate a certificate from a certification authority. .pvk (option C) is a file format used for storing private keys and is not suitable for sharing public keys.
.pfx: This file format is typically used for storing a private key along with the corresponding public key in a password-protected container. It's not meant for sharing just the public key.
.csr: This stands for Certificate Signing Request. It is generated by a user or device to request a digital certificate from a Certificate Authority. It contains the public key but is not the public key itself.
.pvk: This file format is used to store private keys. It's not intended for sharing public keys.
.cer: This is a common file extension for X.509 certificates. It typically contains only the public key and is suitable for sharing. It does not include the private key.
pfx includes both the public and private key for the associated certificate, so don't share this outside your organization. A . cer file only has the public key, it includes the public key, the server name, some extra information about the server. This is what you typically exchange with your partners.
The correct file format for sharing a public key is option D: .cer.
A public key is typically shared in the form of a certificate, which is a digital document that contains the public key and some information about its owner. The .cer file format is commonly used for X.509 certificates, which are a widely accepted standard for digital certificates.
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