Difference Between Authorization and Authentication

Authorization is defined as granting official permission or approval. This word was first coined in between 1600-10.

The word ‘authorization’ is derived from the word ‘authorize’. The word ‘authorize’ originated from two medieval Latin words ‘auctor’ and ‘auctorizare’, an old French word ‘autoriser’ and the English word ‘author’.

The root word of ‘authorization’ is ‘authorize’. ‘Authorize’ originates from a Latin word ‘auctor’, it means ‘the one who causes’.

Authentication is defined as a process to prove something to be genuine. The word ‘authentication’ is derived from the word ‘authenticate’.

The word ‘authenticate’ is derived from the ancient Greek word ‘authentikos’ and late Latin word ‘authenticus’. The word ‘authentication’ was first coined in the 1650s.

Authorization vs Authentication

The main difference between authentication and authorization are by definition, the approach of action, priority order, the process and the usage. These words are often misunderstood as synonyms. But they have different meanings in the technical world. These parameters are used for better understanding of both the words and rightful usage.

Authorization vs Authentication

Let’s understand the use of the word ‘authorization’. Authorization means to permit to do a certain job.

For example, ‘Prince George handed them a signed authorization to enquire’. The sentence means that Prince George has permitted to enquire.

Generally, authorization has legal importance. Now let’s understand the use of the word ‘authentication’.

Authentication is a process to prove a certain entity as valid. For example, ‘access to the system requires authentication’.

The sentence means that participants enrolling to use the system need to verify their identities.


Comparison Table Between Authorization and Authentication (in Tabular Form)

Parameters of ComparisonAuthorizationAuthentication
DefinitionAuthorization determines whether the user is allowed to access the resource or notAuthentication means to identify the validity of the user
ApproachIt determines whether the user has permission to access the resource or notIt determines whether the user is the same as he or she claims to be
PriorityAuthorization is always the top-most priorityAuthentication always comes after a successful authorization
ProcessThe process of authorization is to check the eligibility of the user to access the systemThe process of authentication is to verify the claims of the user
UsageThe word is used mostly in the technical and legal fieldThe word is used mostly in the technical and legal field
ExampleThe owner of the company has the authorization to use our data for security purpose.Joe got rejected because he failed the authentication process.


What is Authorization?

Authorization is a security mechanism that decides whether or not to permit to further access the system. The system may be a file, a database, a service, a computer application, a computer software.

The first step to the web security system is authentication. This steps either grant or deny permission to the user.

Only if this step is successful, the user can further use the system. There are four major types of authorization in API.

  1. API Key
  2. Basic Auth
  3. HMAC (Hash-based Message Authorization Code)
  4. OAuth

Hash-based Message Authorization Code(HMAC) is highly advanced. HMAC uses a secret key which is known only to the user and the server.

There are two types of OAuth.

  1. One-legged OAuth
  2. Two-legged OAuth

One-legged OAuth is used when the data is not very sensitive. This can be used when it is not very important to secure the data.

This is used in case of read-only information. Three-legged OAuth is used when the data is very sensitive.

This is used when it is extremely important to secure the data. Three groups that are participating in such an authorization type are:

  1. The authentication server
  2. The resource server (API server)
  3. The user or app

What is Authentication?

Authorization is the process that verifies the claims made by the user about their identity. It works towards securing the system.

Authentication comes in action only after successful completion of authorization. Application Program Interface(API) is a set of certain rules and protocol to be followed to design any software application.

Authentication is used to secure a modern and advanced system. They are used to avoid any illegal use of data.

There are five major types of authentication.

  1. Password-based Authentication
  2. Multi-factor Authentication
  3. Token-based Authentication
  4. Certificate-based Authentication
  5. Biometric Authentication

Biometric authentication is further categorized as:

  1. Facial Recognition
  2. Voice Identifier
  3. Eye Scanner
  4. Fingerprint Scanner

Authentication is a way to ensure the security of the system and the user’s data. Its objective is to keep the system secure and private.

Hackers always find a new way to enter into system and leak information. So, the basis of authentication needs to improve with time.

A good authentication system is key to build an effective and long-lasting application software. Biometric authentication is the latest and most reliable type of authentication.

Amongst different type of biometric authentication, a fingerprint scanner is the most widely used.


Main Differences Between Authorization and Authentication

  1. Authorization is the process of specifying rights related to a certain system. Authentication is a process involving the verification of the user.
  2. Authorization validates privileges of the user but authentications verify its credentials.
  3. The authorization has priority over authentication.
  4. Authorization asks what permission does the user have in order to access the system. Authentication verifies whether the user is rightful or not.
  5. Authorization checks the role of the user and right to access. Authentication requires username and password.
Difference Between Authorization and Authentication



Authorization and authentication go hand-in-hand. Both of them hold equal importance but have different priority.

It is important to check whether the user has permission or not. It is equally important to verify the claims made by the user about his or her identity.

Authorization and authentication hold a lot of importance for software developers. It is a way to ensure the security and privacy of the data.


  1. https://ieeexplore.ieee.org/abstract/document/4151773/
  2. https://www.nics.uma.es/sites/default/files/papers/JavierLopez2004.pdf
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