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Top 8 Secure Coding Best Practices | Ultimate Guide

Navdeep Singh Gill | 20 January 2022


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What is a Secure Code?

Secure coding could be a collection of strategies that uses security attention. Secure coding is the habit of writing software code or packages defended from vulnerabilities. However, the software package is coded and encrypted to defend against cyber-attack or vulnerabilities. Defects, logic, and bugs imperfections square measure the most purpose of usually exploited software package vulnerabilities. Security consultants have found that almost all vulnerabilities originate from a relatively little variety of normal software package programming errors.

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Why we need Secure Coding?

Secure coding practices detect and remove vulnerabilities that cyber attackers could control from completing the code. Cyber attackers will find it difficult to hack the application and achieve access to applications by designing secure code. Thereby decreasing data breaking.

What is the chance of Insecure Coding?

Insecure Coding strategies do not solely drop your customers in peril. An insecure application offers the chance of hackers accessing your applications. However, they'll affect the name of your organization. This may be why it is necessary to possess secure code.

What are the Best Practices for writing Secure Code?

The Best Practices for writing secure code are listed below:

Input Validations

Any part of an application that enables user input could be a potential security risk.

  • Centralize validation: When you develop an input-validation and data validation architecture for your application, consider developing a library of validation routines in all but the smallest applications. An open library includes routines for all of the various kinds of validation you would like to use, and these will be employed in combination if necessary.
  • Validate all inputs at the server, though they're valid at the consumer. Client-side validation will be bypassed trivially. Therefore it's essential to validate inputs at the server before accepting them.
  • Specify correct character sets, like UTF-8.
  • Use a white list filter with vary, length, and format, rather than a black list filter. Describing what's allowable is safer than simply rejecting the questionable input.
  • If your commonplace validation routine cannot address the subsequent inputs, then they ought to be checked discretely to visualize for null bytes (%00) o Check for brand spanking new line characters (%0d, %0a, \r, \n) o Check for “dot-dot-slash" (../ or ..\) path alterations characters. In cases wherever UTF-8 extended listing encryption is supported, address alternate illustrations like %c0%ae%c0%ae/ (Utilize canonicalization to handle double encryption or different sorts of obfuscation attacks)

XSS - Cross-Site Scripting

Cross-site scripting (XSS) happens once user input is employed as output to the browser while not being valid or encoded. Attackers will use this vulnerability to inject code into the browsers of tourists.

XSS attacks will accustomed airt users to phishing sites, steal cookies and session info, and rewrite parts of the net page the user is visiting.

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Post Validation Actions

Enforcement Actions several kinds of social control actions exist to secure our application and information.

  • Inform the user that the submitted information didn't match the requirements. Therefore, the info ought to be changed to befit the specified conditions.
  • Modify user-submitted information on the server-side while not notifying the user of the changes. This can be the foremost appropriate possibility in systems with interactive usage.

Authentication information

  • Authentication credentials should be sent solely on hypertext transfer protocol POST requests, victimization an encrypted association (HTTPS).
  • When handling authentication errors, your application mustn't disclose that a part of the authentication information was incorrect rather than “Invalid username” or “Invalid password,” use “Invalid username and/or password” interchangeably.
  • Enforce account disabling once a longtime variety of invalid login tries (e.g., 5 tries is common).
  • Re-authenticate users before performing critical operations.

Use Multi-Factor Authentication for sensitive or high-value transactional accounts.

SQL Injection

  • Another common injection because of the shortage of correct output encryption is SQL Injection, largely as a result of a recent dangerous practice: string concatenation.
  • The info will be unbroken safe by victimization-ready statements.

File Management

File uploads ought to solely be restricted to documented users. Once validated that the authenticated user uploads the file. Another vital safety perspective is to ensure that allowed files will be uploaded to the server (whitelisting).

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Remove Sensitive information


Sometimes developers leave comments like hurly-burly lists within the ASCII text file, and generally, within the worst-case situation, developers could leave credentials.


Passing sensitive info victimization, the hypertext transfer protocol GET methodology leaves the application vulnerable because:

Data may be intercepted if not victimization HTTPS by MITM attacks.

  • Browser history stores the user’s info. If the URL has session IDs, pins, or tokens that don’t expire (or have low entropy), they'll be taken.
  • You should invariably take away application and system documentation from the assembly surroundings. Some documents may disclose versions or perhaps functions that might be accustomed to attack your application (e.g., Readme, Changelog, etc.).

Error Handling and work

  • When coping with error logs, the developers ought to guarantee no sensitive info is disclosed within the error responses yet guarantee that no error handlers leak info (e.g., debugging or stack trace information).
  • Additionally, work ought to cowl each roaring and unsuccessful security event, stressing vital log event information. vital event information most typically refers.
  • Only approved people ought to have access to the logs.

Drawbacks of a Secure Code

A secure code review isn't a solution, and performing arts such a review doesn't mean that each instance of a security flaw is discovered. Rather, it's one amongst many activities that will facilitate increasing the standard of associate application and scaling back the number of vulnerabilities in code, making it more challenging for a malicious user to take advantage.

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In conclusion, we'd like you to appreciate that the safety policies, whereas necessary, don't seem to be enough if they're perceived as a limitation, not associated with sweetening. Security begins with the proper angle once building applications. Even the most straightforward tools accustomed to maintaining security should be appropriately utilized within the method so that they're perceived as useful, not a burden.