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Security Tools | The Free Tools Directory | The Free Tools Directory

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Security

119 tools

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NIST CSF Mapper

Map NIST Cybersecurity Framework 2.0 controls to CIS Controls v8, ISO 27001:2022, and SOC 2 Trust Services Criteria

1 option🛡️ Security

HTTP Request Builder

Interactive developer tool for constructing, sending, and analyzing HTTP requests directly from the browser

1 option🛡️ Security

Regex Tester

Test regular expressions with pattern library and explanations

1 option🛡️ Security

Cryptographers and puzzle enthusiasts use the Substitution Cipher tool to encode and decode messages by replacing individual letters of the alphabet with consistent substitutes. By employing a monoalphabetic approach, the interface allows users to create custom mappings or apply standard shifts to secure text or explore the mechanics of classical encryption. It provides a hands-on environment for understanding how historical ciphers function without requiring manual transcriptions. Beyond simple conversion, the platform includes a suite of analysis tools designed to assist in breaking unknown codes. An interactive solving assistant guides users through the decryption process, while built-in frequency analysis charts the occurrence of specific characters to identify likely letter replacements. A dedicated pattern finder further streamlines the workflow by identifying recurring sequences, making it an essential resource for students of cybersecurity and fans of word puzzles alike.

1 option🛡️ Security

Cipher Suite

Collection of classical cipher tools for encryption, decryption, and cryptanalysis including Caesar, Vigenère, and substitution ciphers

1 option🛡️ Security

Cipher Identifier

Analyzing unknown ciphertext becomes significantly easier with a system that automatically identifies the most likely encryption methods used. By examining the structural characteristics of a provided text, the Cipher Identifier evaluates statistical data such as letter frequencies and the Index of Coincidence to narrow down the possibilities. This process allows users to quickly distinguish between various classical and modern ciphers without manual trial and error. Cryptographers, security students, and puzzle enthusiasts find value in this utility when faced with encrypted strings of unknown origin. Pattern matching algorithms look for specific markers that indicate substitution, transposition, or polyalphabetic encryption techniques. Identifying the underlying cipher is the critical first step in decryption, making this an essential starting point for any cryptographic analysis or educational exercise.

1 option🛡️ Security

Affine Cipher

The Affine Cipher utility provides a straightforward way to apply one of the classic monoalphabetic substitution ciphers to text. By using the mathematical formula (ax + b mod 26), users can transform plain text into ciphertext or reverse the process with ease. It simplifies the complexities of modular arithmetic, handling the necessary calculations for the multiplier and shift parameters automatically. Cryptographers, students, and hobbyists find this resource useful for exploring historical encryption or solving cryptographic puzzles. Beyond basic transformation, the interface includes a modular inverse calculator to ensure chosen parameters are valid for encryption. For situations where the encryption key is unknown, the built-in brute force mode systematically tests possible combinations to recover the original message. This implementation ensures that mathematical constraints are met while providing instant results. It serves as an educational resource for understanding how linear functions interact with alphabet mapping, making it a practical addition to any security-focused digital workspace.

1 option🛡️ Security

One-Time Pad

One-time pad encryption provides a method for achieving perfect secrecy through the use of a truly random key that is as long as the message itself. By using a unique, non-repeating key for each communication, the cipher becomes mathematically impossible to crack without the corresponding key. This implementation utilizes XOR operations to combine plaintext with random characters, ensuring that even the most advanced computational methods cannot discern the original message from the resulting ciphertext. Security professionals and students of cryptography find this resource invaluable for demonstrating the principles of information-theoretic security. It offers a straightforward interface for generating random keys and applying them to sensitive data, facilitating secure one-to-one communication. When the generated keys are kept private and destroyed after a single use, the system remains a gold standard for unbreakable digital privacy.

1 option🛡️ Security

Certificate CSR Generator & Format Converter

Managing SSL/TLS certificates requires precision and the right formatting for different server environments. Certificate CSR Generator & Format Converter provides a streamlined interface for creating Certificate Signing Requests and managing various certificate file types. It handles essential formats including PEM, DER, PFX, and P7B, allowing administrators to switch between them as required by their specific infrastructure or application needs. Developers and security professionals can also use the platform to verify certificate chains, ensuring that all intermediate and root certificates are correctly linked and valid. By processing all sensitive data 100% client-side, the utility maintains high security standards, as private keys and request data never leave the local browser environment. This approach combines technical utility with the privacy necessary for handling sensitive security assets.

1 option🛡️ Security

Malware Deobfuscator

Multi-technique deobfuscation tool for malware analysis with auto-detection and chaining

1 option🛡️ Security

Certificate Transparency Lookup

Search Certificate Transparency logs for SSL/TLS certificates and subdomains

1 option🛡️ Security

SSL Checker

Website administrators and developers can ensure their digital certificates are correctly installed and configured using SSL Checker. The utility performs comprehensive scans of server security layers to verify the entire certificate chain, confirming that the site is properly trusted by all major browsers. By identifying expired or misconfigured certificates, it helps maintain a secure connection for users and prevents damaging security warnings. Beyond basic validation, the scanner evaluates protocol support and detects common configuration vulnerabilities that might leave a site exposed. It provides detailed insights into encryption strengths and compatibility across different platforms. This proactive approach to security management allows technical teams to resolve handshake errors or chain issues before they impact site traffic or search engine rankings.

1 option🛡️ Security

SBOM Generator

Developers and security professionals rely on this SBOM Generator to produce detailed inventories of software components, dependencies, and license data. By outputting files in industry-standard formats like CycloneDX and SPDX, it ensures seamless integration with modern security scanners and compliance auditing processes. This functionality is particularly critical for organizations aiming to harden their software supply chains and satisfy the requirements of Executive Order 14028. Maintaining an accurate Software Bill of Materials helps teams identify potential vulnerabilities and manage third-party risks throughout the development lifecycle. This generator provides a machine-readable map of a project’s technical landscape, enabling faster responses to security advisories and more effective license management. It serves as a vital bridge between manual inventory tracking and automated security governance, offering clear visibility into the building blocks of any application.

1 option🛡️ Security

URL Expander

Navigating the internet safely often requires knowing exactly where a link leads before clicking. URL Expander reveals the final destination of shortened links from services like Bitly, TinyURL, and social media platforms. By uncovering the true URL hidden behind a redirect, it helps users avoid potential phishing attempts, malware, and other online threats that often hide behind obscure addresses. Beyond simple expansion, the utility provides a detailed look at the entire redirect chain. Security-conscious individuals and web developers can analyze each step of a URL's journey to see how many hops it takes and where those transitions occur. This transparency ensures that every click is informed and that the final landing page is a legitimate destination.

1 option🛡️ Security

PGP Key Generator

PGP Key Generator provides a streamlined interface for creating secure OpenPGP-compliant key pairs directly within the web browser. It supports a variety of modern cryptographic algorithms, including Curve25519, RSA, and NIST curves, allowing users to tailor their security levels to specific requirements. By processing all encryption and key generation locally on the client side, the application ensures that sensitive private keys never leave the user's device, maintaining a high standard of privacy and data integrity. The platform simplifies the technical complexities of encryption by automatically generating key fingerprints and QR codes for easy sharing and verification. This functionality is particularly valuable for developers, journalists, and privacy-conscious individuals who need to establish secure communication channels or sign digital documents. The intuitive design allows for quick setup without requiring deep cryptographic expertise, making robust encryption accessible for daily digital security needs.

1 option🛡️ Security

Email Authentication Validator

Ensuring that emails reach their destination reliably requires the correct configuration of several key security protocols. The Email Authentication Validator provides a detailed analysis of SPF, DKIM, and DMARC records to identify potential vulnerabilities or DNS misconfigurations. By verifying these settings, it helps prevent unauthorized parties from sending spoofed messages, which protects domain reputation and reduces the risk of outgoing mail being flagged as spam. Users receive a comprehensive security grade along with actionable recommendations for strengthening their email infrastructure. This diagnostic capability is particularly useful for system administrators and IT professionals who need to maintain high deliverability rates and ensure their communications are trusted by receiving servers. The validator converts complex technical data into clear insights, making it easier to manage and secure a domain's email presence.

1 option🛡️ Security

Email Validator & MX Checker

Maintaining clean communication channels begins with verifying the legitimacy of contact information. Developers, marketers, and security professionals use this validator to scrutinize email addresses through multiple layers of technical checks. By analyzing syntax and confirming the existence of Mail Exchanger (MX) records, the utility ensures that a domain is configured to receive messages, effectively reducing bounce rates and protecting sender reputation. Beyond basic delivery checks, the validator identifies disposable email addresses and provides a risk score based on the underlying service provider. This layered approach helps systems automatically filter out temporary or high-risk accounts that might be used for spam or fraudulent activities. Integrating these checks into registration forms or data cleaning workflows enhances database integrity and strengthens overall platform security.

1 option🛡️ Security

MITRE ATT&CK Browser

Explore MITRE ATT&CK tactics and techniques for threat hunting

1 option🛡️ Security

Domain Spoofing Detector

Detect homograph attacks and typosquatting. Analyze suspicious domains or generate protective variants

1 option🛡️ Security

IOC Extractor

Streamlining the process of gathering actionable intelligence, the IOC Extractor provides a dedicated utility designed to pull critical data points from raw text. Security analysts and researchers frequently encounter threat reports, blog posts, or emails containing valuable indicators that need to be parsed for defensive operations. The extractor automatically identifies and isolates key elements such as IP addresses, domain names, URLs, and various file hashes, saving significant time during manual investigations. Handling large volumes of unstructured threat data becomes more efficient by converting messy blocks of text into organized lists of indicators. The application manages the heavy lifting of pattern matching, ensuring that no critical piece of information is overlooked when reviewing complex intelligence documents. By providing a clean output of extracted indicators, it facilitates faster integration into security systems or blocklists, strengthening defensive capabilities through rapid and accurate data processing.

1 option🛡️ Security

Hex Editor

Binary file viewer and editor with hex/ASCII display, search, bookmarks, and byte editing

1 option🛡️ Security

Biometric Performance Simulator

Security professionals and CISSP candidates can explore the technical nuances of identity and access management through the Biometric Performance Simulator. This interactive utility visualizes the critical relationship between False Acceptance Rates and False Rejection Rates, helping users understand how system sensitivity impacts overall security and user experience. By adjusting the sensitivity slider, practitioners can observe real-time changes in performance metrics, making complex theoretical concepts tangible and easier to grasp for exam preparation or system design. The simulator automatically calculates the Crossover Error Rate, providing a clear indicator of a biometric system's overall accuracy where the two error rates intersect. It also facilitates direct comparisons between different biometric modalities, such as fingerprint scans, iris recognition, or voice patterns, to evaluate their respective strengths and weaknesses in various deployment scenarios. This data-driven approach allows for a deeper analysis of how threshold adjustments influence security posture and operational efficiency within the context of access control systems.

1 option🛡️ Security

Hash Generator

Generate cryptographic hashes (MD5, SHA-256, SHA-512) for files and text. Check malware with VirusTotal integration.

1 option🛡️ Security

Hash Lookup

Look up hash values to identify known malware and file signatures

1 option🛡️ Security

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