{"id":9566,"date":"2021-04-21T11:30:00","date_gmt":"2021-04-21T17:30:00","guid":{"rendered":"https:\/\/swimlane.com\/resource\/common-rest-api-authentication-methods-explained-2\/"},"modified":"2025-12-22T03:39:45","modified_gmt":"2025-12-22T10:39:45","slug":"gangige-rest-api-authentifizierungsmethoden-erklart-teil-2","status":"publish","type":"sw_resource","link":"https:\/\/swimlane.com\/de\/blog\/common-rest-api-authentication-methods-explained-2\/","title":{"rendered":"G\u00e4ngige REST-API-Authentifizierungsmethoden erkl\u00e4rt"},"content":{"rendered":"\n\n\n<section class=\"bs-section bs-section-f49668dca89a07af4c4bed27713f079b6839f643 bs-section---default bs-section--blog-inner-banner  \"><style>.bs-section.bs-section-f49668dca89a07af4c4bed27713f079b6839f643{ background-color: #000743;} <\/style><div class=\"container\">\n<div class=\"bs-row row  flex-md-row-reverse bs-row---default\">\n<div class=\" bs-column col-sm-12 col-md-12 col-lg-6   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class=\" bs-column col-sm-12  col-md-12 col-lg-6   bs-column-6a13826d98ae006805bf00373c567a95c3c65a9a bs-column---default d-flex flex-column    \"><div class=\"wp-block-post-date\"><time datetime=\"2021-04-21T11:30:00-06:00\">Apr. 21, 2021<\/time><\/div>\n\n<h1 class=\"wp-block-post-title has-text-color has-white-color\">Common REST API Authentication Methods Explained<\/h1>\n\n\n<div class=\"bs-div bs-div-f106fb945b2c4610a440b9e5b4f63c0c1cbbec02 bs-div---default\"><div class=\"bs-div__inner d-flex flex-wrap align-items-center    \">\n<a class=\"bs-post__author has-text-align-center\" href=\"https:\/\/swimlane.com\/de\/author\/Nick_Tausek\/\">\n\t<div class=\"profile-desc\">\n\t\t<figure>\n\t\t\t<img decoding=\"async\" src=\"https:\/\/swimlane.com\/wp-content\/uploads\/author_Nick_Tausek.jpg\" alt=\"user-avatar\">\n\t\t<\/figure>\n\t\t<span class=\"prefix\"><\/span>\n\t\t<span class=\"name\">\n\t\t\tNick Tausek\t\t<\/span>\n\t<\/div>\n<\/a>\n\n\n\n<div class=\"reading-time\">\n    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class=\"heateor_sss_button_linkedin\" href=\"https:\/\/www.linkedin.com\/sharing\/share-offsite\/?url=https%3A%2F%2Fswimlane.com%2Fde%2Fblog%2Fcommon-rest-api-authentication-methods-explained-2%2F\" title=\"Linkedin\" rel=\"nofollow noopener\" target=\"_blank\" style=\"font-size:32px!important;box-shadow:none;display:inline-block;vertical-align:middle\"><span class=\"heateor_sss_svg heateor_sss_s__default heateor_sss_s_linkedin\" style=\"background-color:#0077b5;width:35px;height:35px;border-radius:999px;display:inline-block;opacity:1;float:left;font-size:32px;box-shadow:none;display:inline-block;font-size:16px;padding:0 4px;vertical-align:middle;background-repeat:repeat;overflow:hidden;padding:0;cursor:pointer;box-sizing:content-box\"><svg style=\"display:block;border-radius:999px;\" focusable=\"false\" aria-hidden=\"true\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"100%\" height=\"100%\" viewBox=\"0 0 32 32\"><path d=\"M6.227 12.61h4.19v13.48h-4.19V12.61zm2.095-6.7a2.43 2.43 0 0 1 0 4.86c-1.344 0-2.428-1.09-2.428-2.43s1.084-2.43 2.428-2.43m4.72 6.7h4.02v1.84h.058c.56-1.058 1.927-2.176 3.965-2.176 4.238 0 5.02 2.792 5.02 6.42v7.395h-4.183v-6.56c0-1.564-.03-3.574-2.178-3.574-2.18 0-2.514 1.7-2.514 3.46v6.668h-4.187V12.61z\" fill=\"#fff\"><\/path><\/svg><\/span><\/a><\/div><div class=\"heateorSssClear\"><\/div><\/div>\n<\/div>\n\n\n\n<div class=\" bs-column col-sm-12  col-lg-8 col-md-11   bs-column-5fcbee853797bef68c609dd2715f511e3ead78a3 bs-column---default bs-column--contents     \">\n<h2>&nbsp;<\/h2>\n<p dir=\"ltr\">When it comes to implementing automation and orchestration, it is critical to understand how authentication works with APIs. The majority of the products in your environment likely have some sort of authentication mechanism. You need to know the nuances and differences between various authentication methods in order to automate communications with those APIs. In this blog post, I aim to help you understand by breaking down three different API authentication methods.<\/p>\n<h2 dir=\"ltr\">Username &amp; Password Authentication<\/h2>\n<p dir=\"ltr\">One of the most common authentication methods used by REST APIs is username and password authentication. There are several different types that use a username and password but the most common one is HTTP Basic authentication. It\u2019s straightforward if you are experienced with APIs but can be challenging for beginners to understand how it works and how to use it.<\/p>\n<p dir=\"ltr\">Per <a href=\"https:\/\/tools.ietf.org\/html\/rfc2617\" target=\"_blank\" rel=\"noopener\">RFC2617<\/a>, making an HTTP Request using Basic authentication requires a base64 encoded string that consists of a username and password combined together with a colon.Once this is done it is prepended with the string `Basic` plus a single space. To make this a little more clear, let\u2019s look at the following example:<\/p>\n<p dir=\"ltr\">Username: first.last<\/p>\n<p dir=\"ltr\">Password: my5uper5ecretP@ssw0rd<\/p>\n<p dir=\"ltr\">Imagine you have a username and password like the above example. To use these as part of an HTTP Request to an API you must first combine them with a colon:<\/p>\n<p dir=\"ltr\">first.last:my5uper5ecretP@ssw0rd<\/p>\n<p dir=\"ltr\">Once that is done then they need to be base64 encoded. In Python you could do the following:<\/p>\n<pre>import base64<\/pre>\n<pre>auth_string = base64.b64encode(b':'.join(('first.last'.encode('latin1'), 'my5uper5ecretP@ssw0rd'.encode('latin1')))).strip()<\/pre>\n<p>If you printed our auth_string variable you would receive the following value:<\/p>\n<p dir=\"ltr\">b&#8217;Zmlyc3QubGFzdDpteTV1cGVyNWVjcmV0UEBzc3cwcmQ=&#8217;<\/p>\n<p dir=\"ltr\">Now that you have this encoded string, you then prepend the authentication method string (which is Basic) to this variable. The entire variable string should be as follows:<\/p>\n<p dir=\"ltr\">Basic Zmlyc3QubGFzdDpteTV1cGVyNWVjcmV0UEBzc3cwcmQ=<\/p>\n<p dir=\"ltr\">Once this string is created then it is added to a specific HTTP Header in your HTTP Request. This header is special and is used for authentication. If you haven\u2019t guessed it yet, the header is called Authorization. Handy, right?<\/p>\n<p dir=\"ltr\">Here is an example cURL command using basic authentication:<\/p>\n<pre>AUTH=$(echo -ne \"$BASIC_AUTH_USER:$BASIC_AUTH_PASSWORD\" | base64 --wrap 0)\n\ncurl \\ \n--header \"Content-Type: application\/json\" \\ \n--header \"Authorization: Basic $AUTH\" \\ \n--request POST \\ \n--data '{\"key1\":\"value1\", \"key2\":\"value2\"}' \\ \nhttps:\/\/example.com\/<\/pre>\n<h2>JWT Authentication<\/h2>\n<p>JWT (JSON Web Token) authentication is a common form of token authentication based on <a href=\"https:\/\/tools.ietf.org\/html\/rfc7519\" target=\"_blank\" rel=\"noopener\">RFC 7519<\/a>. JWT authenitication is made up of three main parts: a Header, Payload, and Signature. Each of these parts is base64 encoded and sent along with an HTTP Request for authentication.<\/p>\n<p dir=\"ltr\">A JWT claim set is made up of one or more claims which are specified in a JSON object. Each claim in a set of claims has a unique key and a corresponding value. For example, the typical structure of a JWT claim set is:<\/p>\n<pre>{\n\n\u201ciss\u201d: \u201cjosh\u201d,\n\n\u201cexp\u201d: 1617221146,\n\n\u201chttps:\/\/api.mycompany.com\/some...\u201d: true\n\n}<\/pre>\n<p dir=\"ltr\">Each key and value must be unique and are considered an individual claim being made within the claim set. Each of these specified keys is arbitrary and is not required by the RFC standard. This means that the structure of the claim set in JWT authentication is up to the API \/ service you are working with.<\/p>\n<p dir=\"ltr\">Just like the Header and Signature values, once you have your JWT claim (payload) defined then it is base64 encoded. You can test these values out on <a href=\"https:\/\/jwt.io\" target=\"_blank\" rel=\"noopener\">https:\/\/jwt.io<\/a> as well.<\/p>\n<h2 dir=\"ltr\">OAuth2 Authentication<\/h2>\n<p dir=\"ltr\">OAuth2 authentication is becoming extremely popular for the simple fact that it supports many different ways (flows) to authenticate to the same endpoint(s). This helps developers build robust services that enable authorization for different situations like authenticating as a web application, desktop application, mobile device, etc. by simply changing a few details instead of supporting an entirely different authentication mechanism for each one.<\/p>\n<p dir=\"ltr\">To help understand the concepts of OAuth2 authentication, I created this diagram that shows the four core components:<\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\">A user or system that is needing access<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\">A server that is responsible for authorization<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\">An application that is granted access via the authorization server<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\">That application then accesses data based on that authorization<\/p>\n<\/li>\n<\/ol>\n<figure><img decoding=\"async\" src=\"https:\/\/swimlane.com\/assets\/uploads\/images\/OAuth2-Authentication-Diagram-2.png\" alt=\"OAuth2 authentication diagram\" data-image=\"186200\"><\/figure>\n<p dir=\"ltr\">If you would like to know more about OAuth2, then please check out the three-part series I wrote explaining OAuth2 in more detail here:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><a href=\"https:\/\/swimlane.com\/blog\/microsoft-oauth2-implementation-1\">Part 1: Endpoints and Application Types<\/a><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><a href=\"https:\/\/swimlane.com\/blog\/microsoft-oauth2-implementation-2\">Part 2: Registering an Application<\/a><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><a href=\"https:\/\/swimlane.com\/blog\/microsoft-oauth2-implementation-3\">Part 3: Using Microsoft Graph API<\/a><\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">When looking at authentication types, OAuth2 and JWT are more secure than Basic and you will likely come across both of these when using APIs, especially when working with products like EDR, SIEM, etc.<\/p>\n<p dir=\"ltr\">There are many other types of REST API authentication as well as variations of the methods listed above but I hope this helped you understand the three most common authentication methods used by APIs.<\/p>\n<\/div>\n\n\n\n<div class=\" bs-column col-sm-12  col-md-12 col-lg-3   bs-column-4ffac197d945e44dadadc9d8f52ba4737135ba21 bs-column---default     \">\n<div class=\"bs-div bs-div-ffc71f24880cf5ca65c4a54e87fb14a656cc562d bs-div---default bs-div--tags\"><div class=\"bs-div__inner     \">\n<h2 class=\"wp-block-heading\" id=\"h-tags\">Tags<\/h2>\n\n\n<div class=\"post-tag-wrapper\">\n    <p><\/p><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"bs-div bs-div-69c461f15bb5fa3fc09d1aa73a0e5865005218ff bs-div---default bs-div--related-posts\"><div class=\"bs-div__inner     \">\n<h2 class=\"wp-block-heading\" id=\"h-related-posts\">Related Posts<\/h2>\n\n\n\n<div class=\"bs-related-posts bs-related-posts-block---default\"><div class=\"bs-related-posts__container\"><div class=\"bs-related-posts__items\">\n<div class=\" bs-column col-sm-4   bs-column-4bb8c1b66cb5e72c43988fbaf017046daf38fc18 bs-column---default     \">\t\t\t\t\t<div class=\"bs-post bs-post-6a03259dbf58f bs-single-post---default enable\" >\n\t\t\t<a class=\"bs-post__trigger\" href='https:\/\/swimlane.com\/de\/blog\/cyber-threat-hunting\/' target='_self'>\t\t\t<div class=\"bs-post__inner\">\n\t\t\t\t<div class=\"bs-post__details\">    <div class=\"bs-post__date\">\n        <span>Sep. 8, 2022<\/span>\n    <\/div>\n    <div class=\"bs-post__title\">\n        <h5>What is Cyber Threat Hunting? Methods, Tools, and Tips<\/h5>\n    <\/div>\n<div class=\"bs-post__learn-more\">\n    <span class='btn learn-more-text bs-post__learn-more-text'>Read More<\/span><\/div>\n<\/div>\t\t\t<\/div>\n\t\t\t<\/a>\t\t<\/div>\n\t<\/div>\n\n\n\n<div class=\" bs-column col-sm-4   bs-column-4bb8c1b66cb5e72c43988fbaf017046daf38fc18 bs-column---default     \">\t\t\t\t\t<div class=\"bs-post bs-post-6a03259dc0d14 bs-single-post---default enable\" >\n\t\t\t<a class=\"bs-post__trigger\" href='https:\/\/swimlane.com\/de\/blog\/power-of-idps-in-cybersecurity\/' target='_self'>\t\t\t<div class=\"bs-post__inner\">\n\t\t\t\t<div class=\"bs-post__details\">    <div class=\"bs-post__date\">\n        <span>Nov. 28, 2023<\/span>\n    <\/div>\n    <div class=\"bs-post__title\">\n        <h5>The Power of IDPS: Enhancing Authentication &amp; Security<\/h5>\n    <\/div>\n<div class=\"bs-post__learn-more\">\n    <span class='btn learn-more-text bs-post__learn-more-text'>Read More<\/span><\/div>\n<\/div>\t\t\t<\/div>\n\t\t\t<\/a>\t\t<\/div>\n\t<\/div>\n\n\n\n<div class=\" bs-column col-sm-4   bs-column-4bb8c1b66cb5e72c43988fbaf017046daf38fc18 bs-column---default     \">\t\t\t\t\t<div class=\"bs-post bs-post-6a03259dc1fe9 bs-single-post---default enable\" >\n\t\t\t<a class=\"bs-post__trigger\" href='https:\/\/swimlane.com\/de\/blog\/understanding-apis-rest\/' target='_self'>\t\t\t<div class=\"bs-post__inner\">\n\t\t\t\t<div class=\"bs-post__details\">    <div class=\"bs-post__date\">\n        <span>Okt. 17, 2019<\/span>\n    <\/div>\n    <div class=\"bs-post__title\">\n        <h5>Understanding APIs: REST<\/h5>\n    <\/div>\n<div class=\"bs-post__learn-more\">\n    <span class='btn learn-more-text bs-post__learn-more-text'>Read More<\/span><\/div>\n<\/div>\t\t\t<\/div>\n\t\t\t<\/a>\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n<\/div>\n<\/div>\n<\/div><\/section>\n\n\n\n<section class=\"bs-section 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