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In cryptography, a public key certificate (also known as a digital certificate or identity certificate) is an electronic document used to prove ownership of a public key. The certificate includes information about the key, information about its owner’s identity, and the digital signature of an entity that has verified the certificate’s contents are correct. If the signature is valid, and the person examining the certificate trusts the signer, then they know they can use that key to communicate with its owner.

In a typical public-key infrastructure (PKI) scheme, the signer is a certificate authority (CA), usually a company that charges customers to issue certificates for them. In a web of trust scheme, the signer is either the key’s owner (a self-signed certificate) or other users (“endorsements”) whom the person examining the certificate might know and trust.

Certificates are an important component of Transport Layer Security (TLS, sometimes called by its older name SSL, Secure Sockets Layer), where they prevent an attacker from impersonating a secure website or other server. They are also used in other important applications, such as email encryption and code signing.

Symantec partners with hosting providers to offer free TLS certificates to...

Symantec wants to see the encrypted Web grow and will offer free basic SSL/TLS certificates to domain owners through Web hosting companies that join...

Encryption project issues 1 million free digital certificates in three months

Let's Encrypt, an organization set up to encourage broader use of encryption on the Web, has distributed 1 million free digital certificates in just...

RHSA-2016:0371-1: Critical: nss security update

Updated nss packages that fix one security issue are now available forRed Hat Enterprise Linux 5.Red Hat Product Security has rated this update as...

Rohde & Schwarz Cybersecurity redefines next generation UTM firewalls

In data transmission, bandwidths in the Gigabit range call for new IT security solutions.This applies in particular to traditional unified threat management (UTM) firewalls,...

Google fixes Android bugs, including lingering Mediaserver flaw

Google addressed 19 security vulnerabilities, seven of them rated critical, in its latest Android security update.  The updates addressed critical security vulnerabilities in the keyring...

More Mac Ransomware Sure to Surface Despite Halt to First Attack

NEWS ANALYSIS: The first known attempt to spread ransomware on Macs was quickly spotted and disabled by security researchers and by Apple, but it...

First Mac Ransomware Poses Little Risk for Users

Quick detection by Palo Alto Networks, Apple and the affected open-source project means most users likely disabled the software before it started to run. A...

First Mac ransomware had sights on encrypting backups, too

The first known working ransomware aimed at Macs contained hints that the cybercriminals were working on a way to encrypt backups in an attempt...

Apple Macs Hit By Ransomware 'For The First Time'

A type of malware that locks computer files and demands a fee for their release has successfully targeted Apple computers.The...

Apple shuts down first-ever ransomware attack against Mac users

With the help of security researchers, Apple over the weekend quickly blocked a cyberattack aimed at infecting Mac users with file-encrypting malware known as...

First working Apple Mac ransomware infects Transmission BitTorrent app downloads

If you downloaded 2.90, you've got a few hours to get rid of it The first "fully functional" ransomware targeting OS X has landed on...

First Mac-targeting ransomware hits Transmission users, researchers say

nrkbeta A security research firm announced Sunday its discovery of what is believed to be the world’s first ransomware that specifically goes after OS X...