What is a Web of Trust?

Mary Elizabeth
Mary Elizabeth

The Web is a nickname for the World Wide Web, which refers both to the interconnected group of Internet sites that are linked by hypertext and also to all the documents on all Internet servers using the HTTP protocol (HyperText Transfer Protocol). Digital identity is generally ascertained by an online credential. Companies employ dated digital certificates issued by a CA (Certified Authority), that is, a trusted third party, as part of the Public-Key Encryption system, which verifies a user’s identity and allows secure communication on the Internet. The Web of Trust (WOT) is another mechanism for verifying digital identity on the Internet. It is an informal mechanism that relies on trust rather than authority.

Man holding computer
Man holding computer

In the Web of Trust as conceived as a mechanism for PGP (Pretty Good Privacy) by its creator Phil Zimmermann, there is no central authority to vouch for identity. Instead, a user with a new public key finds someone with a pair of keys, public and private, and asks that person to be their signer. The signer is meant to verify the identity of the person with the new public key in some indisputable way, for example, a face-to-face meeting. The other step prior to signing the key is to make sure that the key fingerprint in the key is correct, and once signing is complete, the signed key may be posted to key servers. People who trust in the signer and believe that he or she properly identified the public key owner and verified the key fingerprint can then choose to extend their trust to the keys that person has signed.

To make up for the fact that the signers in the system are amateurs, the Web of Trust requires multiple signers. The concept is that with multiple, independent signers, there is a better chance of avoiding the misjudgment or flawed process of any single signer. Rather than the World Wide Web or the growth of trust growing in a weblike fashion, the “web” reference is to the multiplicity of signers vouching for each certificate, creating a web of certitude.

Web of Trust is also a Firefox® browser add-on. It is aimed at helping users avoid online scams including phishing attempts, spyware, viruses, adware, identify fraud, adult content, and spam. The company, that makes it, WOT®, also offers the WOT® Trust Seal, meant to be the sign of a reputable website.

Mary Elizabeth
Mary Elizabeth

Mary Elizabeth is passionate about reading, writing, and research, and has a penchant for correcting misinformation on the Internet. In addition to contributing articles to EasyTechJunkie about art, literature, and music, Mary Elizabeth is a teacher, composer, and author. She has a B.A. from the University of Chicago’s writing program and an M.A. from the University of Vermont, and she has written books, study guides, and teacher materials on language and literature, as well as music composition content for Sibelius Software.

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Discussion Comments


Firefox has some fantastic features, which in my opinion, make it the best web browser. From ad-blocking software, to script security, there are countless add-ons available. By preventing online threats, Web of Trust further shows us what Mozilla Firefox has to offer. In contrast, other browsers (such as Internet Explorer) lack these features, and often have unwanted popups.


In a day and age where viruses are all over the internet, I appreciate what’s being used to prevent these scams. We need protection more than ever, and Web of Trust is a step in the right direction.

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