YanoSec
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Course / 10 Crypto and files / Lesson 16 of 19

The fence

Estimated time: 15 min reading · 15 min activity

Before reading a source, decide whether it belongs to the authorized task. Scope names what you may investigate, how you may use it and when to stop. Consent and privacy still matter even when a page can be opened without signing in.

The module permits its fictional notices, Ada North’s supplied profile, saved page, image description and registration table. It does not permit a classmate’s profile, a real account, a neighborhood map, contacting anyone or posting the packet publicly. This is a course exercise boundary, not a statement about the law in every place.

Before you begin

Estimated time
15 min reading, 15 min activity. Setup and optional practice may take longer.
Where you work
Use only the supplied fictional corpus: notices, source cards, saved page, image description/map and DNS/registration table. Keep work in private notes. No real-person research, live search, image upload, map lookup, contact or account is required or authorized by this exercise.
Without a lab
All evidence needed for the activity appears on this page. Copy it into notes if downloads are unavailable. Read the labeled model and predict each result; a paper trace practises the reasoning while tool operation waits for a lab. Reading needs no JavaScript. Answer checking needs JavaScript and a secure context; saving progress also needs usable browser storage.

After this lesson you can:

  • Choose the packet card from the three source cards.
  • Name one stop condition for a classmate's page.
  • Treat the fence as a course rule, not as a statute.

01Example

Fresh scope comparison within the module’s allowed materials.

Task: compare supplied fictional notices.
Proposed action: read the packet’s image-description card.
Decision: it is supplied material, but use it only if relevant to the question.
Stop: if completing the task would require an outside person, source or contact.

02Permission is the card, not the fact that a page loads

Loading successfully establishes availability, not permission or relevance. Ask three separate questions: is this source in the granted corpus, does it help the research question, and what may be recorded or shared?

If useful evidence would require crossing the boundary, keep an unresolved question instead of widening the task yourself. Sharing methods later can use abstract steps or redacted examples. This activity ends with a private note; it includes no message sending or publication.

Choose a permitted fictional source and set a clear stopping point before gathering information.Model. A teaching model drawn by hand. It shows the idea, not real tool output.

Read the full explanation below.

Read the supplied relevant cardNeed an outside person or source
Supplied task material

Task: compare supplied fictional notices.

met · Image-description card is in the fictional packet.
Relevance

Read the packet’s image-description card only if relevant to the question.

met · Use it only for the supplied relevant question.
Outside contact or source

Stop: if completing the task would require an outside person, source or contact.

met · No outside contact or source is needed.
Apply the stated rule
Within task material

Availability of material does not remove the relevance limit.

A source's availability is not a research grant; relevance and scope both limit the task.

Availability of material does not remove the relevance limit.

Follow the explanation

  1. Availability of material does not remove the relevance limit.
  2. A page loading does not authorize a wider investigation.
Read every state and value

1. Availability of material does not remove the relevance limit.

Case
packet
Conditions inspected
packet · Relevance · Outside contact or source
Decision shown
Yes

2. A page loading does not authorize a wider investigation.

Case
outside
Conditions inspected
packet · Relevance · Outside contact or source
Decision shown
Yes
A source's availability is not a research grant; relevance and scope both limit the task.

03Choose the allowed card

The supplied source cards describe three choices. Apply the scope before reading beyond their descriptions.

Label: course fence for this module. Original rule card. Not a statute.
Allowed: the fictional notices, the fictional profile Ada North inside privacy-cards.txt, the saved search page, the image card, and the fictional registration table.
Stop: a classmate's profile, a real person's account, a live map of a neighborhood, a contact attempt, and posting the packet outside the course notes.
Public visibility is not the same as this packet's permission.
The card does not decide the law of any country. Stage 01 still holds the broader scope lesson.

Download the course fence

Label: choose a source. Original fiction.

Card packet: profile Ada North, club role lamp keeper, appears only in this file.
Card classmate: a real student's public page. Outside the packet.
Card neighborhood: a live map of a real street. Outside the packet.

Activity choice: the packet card.
The classmate card stays closed.

Download the source cards

  1. Locate the fictional profile Ada North in the packet card and match it to the allowed list.
  2. Record the permitted choice as packet. Mark the classmate and neighborhood cards outside the corpus; do not fetch the sources they describe.
  3. Write a stopping condition: if the next step needs a real profile, map or contact, leave that question unresolved.
  4. Stop after the private note. A public page’s existence does not change the grant.

04Optional challenge

For about ten optional minutes, make a shareable method sentence using source labels rather than a person’s role. Explain that the actual packet and notes stay private. This is a redaction draft; nothing is posted.

05Fresh cases for the checks

Use these fictional cases for the checks below. They have different inputs from the worked examples. Read them here or make notes; no installation or external service is needed.

Fence card A: fresh fictional research grantOwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.

Question: where does the packet place the spare key?
Allowed: supplied fictional notices, saved map card and fictional profile Ivo Reed inside this packet.
No real people, external profiles, live maps, contact or public posting.
A1: supplied notice about the key.
A2: supplied fictional profile unrelated to the key.
A3: a classmate’s publicly visible account outside the packet.
This fence is a course rule; it makes no claim about any country’s law.

Proposal card B: independent sequenceOwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.

Allowed action: read supplied fictional notes only.
S1: open the supplied note.
S2: compare its text with another supplied note.
S3: proposed next step is to open a real person’s external profile.
S4: proposed contact with that person.
S3 and S4 have not been performed.

06Explain the evidence and its limit

Optional self-check: make a short permission, relevance, audience and stop checklist for a fictional research question.

Review it: separate allowed material from useful material, stop before the first outside-source action, and state that the course fence does not decide legal questions.

07Common mistakes

If public means allowed in your note, separate access from the explicit target/source restriction.

If the exercise seems impossible without outside material, record the gap and stop; an unresolved conclusion is preferable to invented permission.

If a private draft is ready to share, check the event or course rule first; this activity itself authorizes no publication.

References

  • NIST SP 800-115

    Background on agreed scope and rules of engagement; this exercise uses its explicit fictional source boundary.