Documents Authentication and Legalisation of Documents

The law in most countries requires that a signature on a document be witnessed or other procedures applied before the document can be used for legal purposes or in a court of law. Solicitors, justices of the peace, and notaries public normally perform these functions in every country.Authenticate documents which are executed in all over the world include: birth/death certificates, power of attorney, marriage certificates, diplomas, adoption application papers, business license, etc. Notarial services, or the legalisation of documents to people planning to use documents in all across the globe, through its State/Territory offices in every country and its diplomatic missions overseas.
Authentication essentially boils down to a series of tests that a user must undergo.

It is impossible for a computer user to be authenticated without a trace of a doubt, even with stringent authentication methods, like biometrics. The key to a good security policy is to determine an adequate mix of tests that ensure a high degree of impenetrability. Authentication is the process of ensuring that an entity, person or object is what it claims to be. It is used as the first step towards access control, by establishing identity against a database of stored users. It is important to note that although authentication is always present in security applications, it does not actually have anything to do with the actual access control.

In the matter of computers and internet how authentication done. Each user registers initially (or is registered by someone else), using an assigned or self-declared password.On each subsequent use, the user must know and use the previously declared password. The weakness in this system for transactions that are significant (such as the exchange of money) is that passwords can often be stolen, accidentally revealed, or forgotten.