Separate a Hash from Encryption
Distinguish digest comparison, reversible confidentiality protection and source authentication.
About 22 minutes, plus any extended practice
Open lesson 1Distinguish Security and Privacy Boundaries
A private service sends detailed answers to an external provider and supplies a signed report. Explain the data-flow/privacy question and what a valid signature does not establish.
Before you begin
- Understand authentication, authorization and data purposes.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Explain a Signature Verification Role
Separate signing with a private key from verification and from judging content truth.
About 22 minutes, plus any extended practice
Open lesson 2Separate Secure Access from Appropriate Data Use
Check why data is collected and used as well as who may access it.
About 22 minutes, plus any extended practice
Open lesson 3Map Data Flows across a Trust Boundary
Identify the receiver and applicable protection at each stated data-flow step.
About 22 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- 2026 CSTA PK–12 Computer Science Standards: topic reference — Systems & Security; Computing & Society
These references informed the topic selection. They do not certify complete standards alignment.