The Best RSA encryption, decryption and prime calculator Alternatives in 2026

Protect payment data with Evervault’s encryption model while retaining control of the payment experience.

This GitHub list curates cryptography resources and links for people exploring the field.

Online Tools offers browser-based utilities for hashing, encoding, encryption, formatting, compression, file processing, and more.

Let’s Encrypt is a nonprofit that provides automated TLS certificates for securing websites with HTTPS.

Big Number Calculator evaluates very large mathematical expressions in a web browser.

The Text and File Hash Calculator computes hashes such as MD5, SHA-1, SHA-256, SHA-512, and Whirlpool.

Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.

Generate secure SSL configurations for selected web, database, and mail software.

Solve reverse engineering challenges published on challenges.re, a challenge-focused site.

GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.

Search the National Vulnerability Database, a public resource for vulnerability information.

View Toronto Police calls for service on a map that updates in real time, according to the supplied page description.

Add proof-of-work verification to websites with mCaptcha, a privacy-focused automated CAPTCHA system.

WhatsMyDNS checks DNS record propagation across global resolvers for record types including A, AAAA, MX, and TXT.

Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.

The Snyk Security Database provides vulnerability details and remediation guidance for packages and cloud configurations.

The URL Decoder and Encoder converts text between encoded and decoded forms, including JavaScript URLs.

Lucia was deprecated in March 2025. The website was updated in July 2026 and points to code/auth_session.ts as a single-file replacement for the NPM package and to the Auth Book for auth information.

DNSPerf compares the performance and uptime of enterprise and commercial DNS providers.

Search a community-curated collection of bug bounty writeups and learning resources.

Steganography Online encodes a message into an image and can decode messages from images.

UUID Tools generates individual or bulk UUIDs and supports multiple UUID versions.

Test a browser for privacy leaks, including exposed IP addresses, device information, and fingerprinting risks.

Fraunhofer FKIE maintains Malpedia, a reference that organizes information about malware families.