API Security Explained: Full Breakdown & Transcript

[00:07] opening your banking app. You check your account balance, transfer money, or pay a bill. Everything feels normal. But behind every single action, there is a hidden system working silently in the background. And that system decides, is

[00:22] this user really allowed to access this information? That system is an API. API acts as a bridge between different applications, allowing them to exchange information and perform actions. But here's something important. How do we

[00:36] make sure that only the right people and applications can access this information? This is where API security comes into the picture. So, let's look at what we are going to cover in this video. So, today we will understand what

[00:50] APIs are, why API security is important, common API security threats, different methods used to secure APIs, and a real-world example of API security. So, stay till the very end as this video

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[01:47] course link is available in the description box below. So, without any further delay, let's get started. So, without any further delay, let's get started. And before understanding API security, let's first understand what an

[02:02] API is. So, API stands for application programming interface. Simply putting, an API is a set of rules that allows two different software applications to communicate with each other. So, let's try to understand it with a simple

[02:16] example. Think of an API like a waiter in a restaurant. You as a customer do not directly go to the kitchen, right? And prepare your food. want. The waiter communicates with the

[02:31] The kitchen prepares the food, and the waiter brings it back to you. Here, you are the application requesting information, the waiter is the API, and the kitchen is the server or database. The API receives requests, processes

[02:47] them, and returns the required response. Now, let's look at why do we need API security. APIs often handle sensitive information, such as user account, payment details, personal information, business data, application secrets, and

[03:04] if an API is not properly secured, then attackers can easily access private user data, perform unauthorized action, steal credentials, modify important information. So, let's understand this with a simple example. Imagine a

[03:20] shopping application where users can view their orders. A normal request may look like this. Which includes get orders and user ID. The API should check, is this user actually allowed to view these orders? If the API does not

[03:36] verify permissions properly, an attacker could simply change the user number, as you can see on the screen, and easily access someone else's order details. And this type of vulnerability is called broken access control. Now, let's look

[03:51] broken access control. Now, let's look at some common API security threats. First, we have broken authentication. Authentication answers one important question, and that is who are you? APIs use authentication to verify the

[04:04] use authentication to verify the identity of users or the applications. You enter your username and password. The API verifies your identity. If everything matches, access is granted. But, if authentication is weak,

[04:18] attackers can steal the credentials and access your account. Now, if we want to avoid this, then we can adopt common protection methods including strong passwords, multi-factor authentication, or secure token-based authentication.

[04:35] Now, coming towards another security threat, that is broken authorization. Authentication basically tells us who you are, and authorization decides what

[04:47] are you allowed to do. For example, in an online learning platform, a student can watch courses and download the certificates. But, on the other hand, administrator can add courses, manage users, view reports, and do lot many

[05:02] other things that students are not allowed to do. So, the API must ensure users only perform actions that they are authorized to do. Now, at third, we have data exposure. Sometimes, APIs accidentally expose more information

[05:17] than required. For example, a user profile API may only need to return name, profile picture, course details. But, due to poor design, it may also return password, credit card information, or internal system details.

[05:33] And this creates security risk. APIs should always return only the necessary information. Now, at number four, we have injection attacks. Injection attacks happen when attackers send malicious input through an API. For

[05:49] example, a search API allows users to search products. Instead of entering laptop, an attacker sends harmful command. If the API does not validate input properly, attackers may manipulate databases or systems.

[06:05] And this is how we can protect it. Including input validation, parameterized queries, and secure coding practices. Now, at number five, we have API abuse and rate attack. Imagine an API receiving millions of requests

[06:21] within seconds. This could slow down or crash the application. Attackers can perform denial-of-service attacks, automated scrapping, brute-force attacks. And to prevent this, organization normally use rate limiting.

[06:36] For example, a user can make only 100 API request per minute. After reaching the limit, additional requests are blocked temporarily. So, this is how this attack can be protected. So, these were some of the security threats

[06:50] related to API. Now, let's talk about how we can secure APIs. APIs are secured using multiple layers of protection to prevent unauthorized access and data

[07:02] theft. One common method is token-based authentication, where after successful login, the server generates a secure token. The user sends this token with future API request, and the API verifies whether the token is valid before

[07:18] authentication methods include JWT tokens, OAuth 2.0, and API key. Another important security measure is HTTPS encryption. Since APIs transfer data

[07:30] between applications and servers, HTTPS protects this communication by encrypting the information. This ensures that sensitive data like passwords, payment details, and personal information cannot be easily read if

[07:44] intercepted by attackers. Now, input validation is also essential because API should never blindly trust user requests. The API checks whether the data format is correct, values are allowed, and requests do not contain

[07:58] harmful commands. This helps prevent attacks like SQL injection and other malicious activities. Finally, logging and monitoring help organizations track API activities and identify suspicious behavior. They monitor failed login

[08:12] attempts, unusual traffic patterns, and unauthorized access attempts. This allows security teams to detect theft early and take action before major damage occurs. So, these are some methods through which we can secure API.

[08:27] Now, let's connect how we are successfully able to log in to our banking details. See, you open your banking app and check your account balance. The process looks like this. Step one, you enter your login details,

[08:41] then the API verifies your identity. Step two, the bank generates a secure authentication token. Step three, your app sends a request that is, "Show my account balance." Step four, the API checks, "Is this token valid? Is this

[08:58] user authorized? And is this request secure?" Once all these requests are successfully verified, then the step five comes in. The API sends your balance information through an encrypted connection. Every step ensures your

[09:12] financial data remains protected. So, this is how you are able to fetch your balance. Now, let's summarize our topic by discussing the best practices for API security. So, the best practices includes number one, always use HTTPS

[09:29] encryption. That is, Hypertext Transfer Protocol Security. Step two, implement strong authentication. Third, apply proper authorization rules. Fourth, proper authorization rules. Fourth, validate all user inputs. Fifth, limit

[09:44] API request using rate limiting. Sixth, keep APIs updated and patched. Seventh, monitor API activity regularly. And the eighth point, never expose sensitive

[09:56] information unnecessarily. So, these were some of the best practices for your API security. APIs are the backbone of modern applications. They connect mobile apps, websites, cloud services, and businesses. But, because APIs handle

[10:12] important information, protecting them is extremely important. To summarize, API security ensures that the right users get the access. Second, data remains protected. Third, applications communicate safely. And understanding

[10:27] API security is an essential skills for developers, cybersecurity professionals, and anyone working in modern technology. So, I hope you found this explanation useful. Make sure to like the video and subscribe for more technology tutorials.

[10:42] Thank you for watching, and I'll see you in the next one.