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QR Challenge: reputation systems

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. CONFIDANT reputation system takes into consideration only thenegative reputation
2. in schemes that reward ......, a node can behave well for a period of time to boost its reputation before launching an attackgood behavior
3. false accusations is a disadvantage of ...... reputation systemCONFIDANT
4. to prevent denial of service attack in core reputation system ...... is not shared with other nodesnegative reputation
5. one of challenges associated with the design of...... in a MANET they are prone to attacks from malicious nodesreputation systems
6. when Purse Model were proposed assume that each node has a ....tamper-resistant hardware module
7. in ..... The source of the packet needs to know how many hops the packet needs to travel so that it loads the packet with enough cash to satisfy all the forwarding nodesPurse Model
8. in purce model The source does not need to expend any cash to originate a packet leaving the scheme open to ....... from the sourcedenial of service attacks
9. ....... can be easily detected if all routing messages are signedspoofing
10. disadvantage of ....... messages it increases the overhead since it increases the size of routing messages and the amount of processing needed to process each routing messagesigning routing
11. Trade-off between setting a threshold to such a small level that several ..... are generated false positives
12. A node may advertise a large number of nodes as its neighbors may create a ..... black hole

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=CONFIDANT_reputation_system_takes_into_consideration_only_the

Question 1 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=in_schemes_that_reward_......,_a_node_can_behave_well_for_a_period_of_time_to_boost_its_reputation_before_launching_an_attack

Question 2 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=false_accusations_is_a_disadvantage_of_......_reputation_system

Question 3 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=to_prevent_denial_of_service_attack_in_core_reputation_system_......_is_not_shared_with_other_nodes

Question 4 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=one_of_challenges_associated_with_the_design_of......_in_a_MANET_they_are_prone_to_attacks_from_malicious_nodes

Question 5 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=when_Purse_Model_were_proposed_assume_that_each_node_has_a_....

Question 6 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=in_....._The_source_of_the_packet_needs_to_know_how_many_hops_the_packet_needs_to_travel_so_that_it_loads_the_packet_with_enough_cash_to_satisfy_all_the_forwarding_nodes

Question 7 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=in_purce_model_The_source_does_not_need_to_expend_any_cash_to_originate_a_packet_leaving_the_scheme_open_to_......._from_the_source

Question 8 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=......._can_be_easily_detected__if_all_routing_messages_are_signed

Question 9 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=disadvantage_of_......._messages_it_increases_the_overhead_since_it_increases_the_size_of_routing_messages_and_the_amount_of_processing_needed_to_process_each_routing_message

Question 10 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=Trade-off_between_setting_a_threshold_to_such_a_small_level_that_several_....._are_generated

Question 11 (of 12)

 


reputation systems: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_node_may_advertise_a_large_number_of_nodes_as_its_neighbors_may_create_a_.....

Question 12 (of 12)