Update README.md

Author: edoardottt

README.md

@@ -105,6 +105,7 @@ A curated list of awesome search engines useful during Penetration testing, Vuln
 - [Shodan CVEDB](https://cvedb.shodan.io/) - The CVEDB API offers a quick way to check information about vulnerabilities in a service
 - [Vulert](https://vulert.com/vuln-db) - Recent security issues found in open-source packages
 - [promptfoo.dev Language Model Security Database](https://www.promptfoo.dev/lm-security-db/) - A comprehensive collection of LLM vulnerabilities, curated from cutting-edge research papers and real-world discoveries
+- [opencryptography.com](https://opencryptography.com/) - Free public database of 10,000+ unique Docker image scans for hidden cryptographic assets and critical implementation flaws
 
 ### Exploits