Here are some solid resources—books, videos, tools, courses, and more—to help you master cryptography and understand the techniques behind encryption, decryption, and securing information.

A review of OSEP (PEN-300) Offsec Certification.

Support is an easy-difficulty Windows machine on Hack The Box (HTB) that focuses on SMB misconfigurations, LDAP credential extraction, and Kerberos-based privilege escalation.