OpenSSL
Course: AP® Cybersecurity Shows up in: Unit 5: Securing Applications and Data
A command line tool for encrypting and decrypting with symmetric (openssl enc) and asymmetric (openssl genrsa, pkeyutl) algorithms.
Appears in the course and exam description (CED): 5.3.B.35.3.B.45.4.C.25.4.C.3
Why it matters in Unit 5
-e encrypts, -d decrypts; -pubin uses a public key.
Example
openssl enc -aes-128-cbc -d -in notes.enc -k password -out notes.txt
Learn it properly, with a checkpoint 5.3 Protecting Stored Data with Cryptography