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All questions of Sending Secret Messages for Year 3 Exam
Why is information security important when using networks?- a) To ensure information is shared publicly
- b) To prevent unauthorized access to sensitive data
- c) To limit user access to the internet
- d) To make data retrieval faster
Correct answer is option 'B'. Can you explain this answer?
Why is information security important when using networks?
a)
To ensure information is shared publicly
b)
To prevent unauthorized access to sensitive data
c)
To limit user access to the internet
d)
To make data retrieval faster
|
Indu Gupta answered |
Information security is crucial because it protects sensitive data from unauthorized access. Networks are often vulnerable to interception, and safeguarding information helps prevent potential theft or harm, such as identity theft or financial loss.
What is the historical significance of ciphers?- a) They have been used throughout history for secret communication
- b) They are only used in modern technology
- c) They are primarily used in mathematics
- d) They are not relevant to historical events
Correct answer is option 'A'. Can you explain this answer?
What is the historical significance of ciphers?
a)
They have been used throughout history for secret communication
b)
They are only used in modern technology
c)
They are primarily used in mathematics
d)
They are not relevant to historical events
|
Edgy Education answered |
Ciphers have played a crucial role in history as tools for secret communication. For example, ancient Greeks used ciphers to send messages discreetly. This illustrates their long-standing importance in safeguarding information across different eras.
What is the role of the recipient in the use of ciphers?- a) To create the cipher
- b) To decode the ciphertext using the shared rules
- c) To ignore the message
- d) To send the message again
Correct answer is option 'B'. Can you explain this answer?
What is the role of the recipient in the use of ciphers?
a)
To create the cipher
b)
To decode the ciphertext using the shared rules
c)
To ignore the message
d)
To send the message again
|
Torcia Education answered |
The recipient's role is to decode the ciphertext back into plaintext using the shared cipher rules. This collaboration between sender and receiver is essential for effective communication, especially when sensitive information is involved.
What does a letter-to-number code involve?- a) Assigning each letter a random symbol
- b) Using fruit to represent each letter
- c) Replacing letters with numbers, e.g., A=01, B=02
- d) Writing letters in reverse
Correct answer is option 'C'. Can you explain this answer?
What does a letter-to-number code involve?
a)
Assigning each letter a random symbol
b)
Using fruit to represent each letter
c)
Replacing letters with numbers, e.g., A=01, B=02
d)
Writing letters in reverse
|
|
Edgy Education answered |
A letter-to-number code assigns a specific number to each letter of the alphabet, providing a consistent method for encoding messages. For example, "hello" translates to "08 05 12 12 15," making it a systematic approach to coding.
Which of the following best describes a flip text cipher?- a) Using random symbols to replace words
- b) Using animals to represent letters
- c) Writing the letters of a message backwards
- d) Replacing letters with numbers
Correct answer is option 'C'. Can you explain this answer?
Which of the following best describes a flip text cipher?
a)
Using random symbols to replace words
b)
Using animals to represent letters
c)
Writing the letters of a message backwards
d)
Replacing letters with numbers
|
|
Indu Gupta answered |
A flip text cipher involves reversing the order of letters in a message, making it a simple yet effective method of creating ciphertext. This type of cipher is accessible for beginners and illustrates the basic principles of encoding.
What is the main difference between plaintext and ciphertext?- a) Plaintext can be read by anyone; ciphertext cannot be understood without a cipher
- b) Plaintext is shorter than ciphertext
- c) Plaintext is only used for numbers
- d) Plaintext is encrypted; ciphertext is not
Correct answer is option 'A'. Can you explain this answer?
What is the main difference between plaintext and ciphertext?
a)
Plaintext can be read by anyone; ciphertext cannot be understood without a cipher
b)
Plaintext is shorter than ciphertext
c)
Plaintext is only used for numbers
d)
Plaintext is encrypted; ciphertext is not
|
Rahul Kumar answered |
The key difference is that plaintext is the original, readable message, while ciphertext is the encoded version that cannot be understood without the appropriate cipher. This distinction is fundamental to the practice of cryptography.
What is the primary purpose of a cipher?- a) To transform plaintext into ciphertext for secure communication
- b) To serve as a form of entertainment
- c) To create random characters
- d) To make plaintext readable to everyone
Correct answer is option 'A'. Can you explain this answer?
What is the primary purpose of a cipher?
a)
To transform plaintext into ciphertext for secure communication
b)
To serve as a form of entertainment
c)
To create random characters
d)
To make plaintext readable to everyone
|
|
Indu Gupta answered |
A cipher is designed to convert readable information (plaintext) into an unreadable format (ciphertext), ensuring that only authorized individuals with the corresponding decryption key can access the original message. This is crucial for maintaining the confidentiality of sensitive information.
Which coding technique uses a reverse alphabet mapping?- a) Letters-to-letters code
- b) Fruit code
- c) Letter-to-number code
- d) Animal code
Correct answer is option 'A'. Can you explain this answer?
Which coding technique uses a reverse alphabet mapping?
a)
Letters-to-letters code
b)
Fruit code
c)
Letter-to-number code
d)
Animal code
|
|
Edgy Education answered |
The letters-to-letters code uses a reverse alphabet mapping, where each letter is substituted by another letter from the opposite end of the alphabet (e.g., A becomes Z). This technique offers a straightforward method of encoding messages while maintaining security.
What does the term "plain text" refer to?- a) A type of code used for security
- b) The encrypted version of a message
- c) The original, readable message
- d) A message that has been decoded
Correct answer is option 'C'. Can you explain this answer?
What does the term "plain text" refer to?
a)
A type of code used for security
b)
The encrypted version of a message
c)
The original, readable message
d)
A message that has been decoded
|
|
Rahul Kumar answered |
Plain text refers to the original message that is composed of easily readable letters or numbers. It is the version of the message before any encryption or coding takes place, making it understandable to anyone.
In the context of information security, what does "unauthorized access" imply?- a) Access granted by the owner of the data
- b) Access that is always monitored
- c) Access that is always secure
- d) Access to data by individuals not permitted to view it
Correct answer is option 'D'. Can you explain this answer?
In the context of information security, what does "unauthorized access" imply?
a)
Access granted by the owner of the data
b)
Access that is always monitored
c)
Access that is always secure
d)
Access to data by individuals not permitted to view it
|
Vp Classes answered |
Unauthorized access refers to situations where individuals gain entry to information or systems without permission. This can lead to serious security breaches, including theft of sensitive data, highlighting the importance of protective measures like ciphers.
How do ciphers help protect sensitive information?- a) They make the information easier to read
- b) They increase the speed of data transmission
- c) They eliminate the need for passwords
- d) They ensure only authorized individuals can decode the message
Correct answer is option 'D'. Can you explain this answer?
How do ciphers help protect sensitive information?
a)
They make the information easier to read
b)
They increase the speed of data transmission
c)
They eliminate the need for passwords
d)
They ensure only authorized individuals can decode the message
|
Yashina Kapoor answered |
Ciphers protect sensitive information by encoding it in such a way that only individuals with the appropriate decryption key can read it. This ensures that even if the information is intercepted, it remains secure from unauthorized access.
How can ciphers help in everyday tasks like online shopping?- a) By increasing delivery speed
- b) By making websites look more appealing
- c) By securing sensitive information during transactions
- d) By simplifying the shopping process
Correct answer is option 'C'. Can you explain this answer?
How can ciphers help in everyday tasks like online shopping?
a)
By increasing delivery speed
b)
By making websites look more appealing
c)
By securing sensitive information during transactions
d)
By simplifying the shopping process
|
|
Edgy Education answered |
Ciphers play an important role in securing sensitive information, such as credit card details, during online transactions. By encrypting this data, ciphers help protect against unauthorized access and fraud, ensuring safer shopping experiences.
Which of the following is true about ciphertext?- a) It is the same as plaintext
- b) It is the encoded message that requires a cipher to decode
- c) It can be easily read without a cipher
- d) It is always longer than plaintext
Correct answer is option 'B'. Can you explain this answer?
Which of the following is true about ciphertext?
a)
It is the same as plaintext
b)
It is the encoded message that requires a cipher to decode
c)
It can be easily read without a cipher
d)
It is always longer than plaintext
|
|
Vp Classes answered |
Ciphertext is the result of encoding a plaintext message. It is intentionally made unreadable without the proper cipher, thus protecting the information from unauthorized access. This characteristic is essential for information security.
Which of the following statements about codes is true?- a) Codes are always longer than the original message
- b) Codes replace letters or words with different symbols or words
- c) Codes are the same as ciphers
- d) Codes can only use letters
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements about codes is true?
a)
Codes are always longer than the original message
b)
Codes replace letters or words with different symbols or words
c)
Codes are the same as ciphers
d)
Codes can only use letters
|
|
Yashina Kapoor answered |
Codes function by substituting letters or words in a message with different symbols or words. This transformation allows messages to be kept secret from those who do not know the specific coding system used.
What is a common example of a simple coding technique?- a) Writing letters backwards
- b) Using binary code
- c) Using multiple languages
- d) Encrypting with a complex algorithm
Correct answer is option 'A'. Can you explain this answer?
What is a common example of a simple coding technique?
a)
Writing letters backwards
b)
Using binary code
c)
Using multiple languages
d)
Encrypting with a complex algorithm
|
Freak Artworks answered |
Writing letters backwards, known as the flip text cipher, is a straightforward coding method. For example, the phrase "hide the gems" becomes "smeg eht edih" when reversed. This technique is easy to understand and implement.
What is a key benefit of using simple codes for communication?- a) They eliminate the need for encryption
- b) They are easy to learn and use
- c) They can only be understood by experts
- d) They are complex and hard to decipher
Correct answer is option 'B'. Can you explain this answer?
What is a key benefit of using simple codes for communication?
a)
They eliminate the need for encryption
b)
They are easy to learn and use
c)
They can only be understood by experts
d)
They are complex and hard to decipher
|
|
Rahul Kumar answered |
Simple codes are beneficial because they are straightforward to learn and implement, making them accessible for various users. This encourages creativity and engagement in writing secret messages, especially in educational contexts.
In a fruit code, what does each fruit represent?- a) A different number
- b) A specific symbol
- c) A different letter of the alphabet
- d) A type of animal
Correct answer is option 'D'. Can you explain this answer?
In a fruit code, what does each fruit represent?
a)
A different number
b)
A specific symbol
c)
A different letter of the alphabet
d)
A type of animal
|
|
Edgy Education answered |
In a fruit code, each letter of the alphabet is represented by a specific type of fruit. This creative coding method allows for secret communication, as only those who know the fruit-to-letter mapping can decode the message.
What is an example of an animal code?- a) Each letter is assigned a specific number
- b) Each letter is written backwards
- c) Each letter is represented by a different animal
- d) Each letter corresponds to a different fruit
Correct answer is option 'C'. Can you explain this answer?
What is an example of an animal code?
a)
Each letter is assigned a specific number
b)
Each letter is written backwards
c)
Each letter is represented by a different animal
d)
Each letter corresponds to a different fruit
|
|
Rahul Kumar answered |
In an animal code, each letter of the alphabet is represented by a different animal. This technique allows for creative and engaging secret messages, where recipients need to know the specific animal-to-letter mapping to decode the message.
Why is it important for the sender and recipient to share cipher rules?- a) To confuse others
- b) To avoid using any codes
- c) To create more complex messages
- d) To ensure that the message can be decoded correctly
Correct answer is option 'D'. Can you explain this answer?
Why is it important for the sender and recipient to share cipher rules?
a)
To confuse others
b)
To avoid using any codes
c)
To create more complex messages
d)
To ensure that the message can be decoded correctly
|
|
Yashina Kapoor answered |
Sharing cipher rules between the sender and recipient is crucial for ensuring that the encoded message can be accurately decoded back into its original form. Without this mutual understanding, the intended communication could be lost or misunderstood, defeating the purpose of using a cipher.
What happens if someone intercepts a message encoded with a cipher?- a) They can read the message without any issues
- b) The message will be deleted
- c) They will only see the plaintext
- d) They will need the decryption key to understand it
Correct answer is option 'D'. Can you explain this answer?
What happens if someone intercepts a message encoded with a cipher?
a)
They can read the message without any issues
b)
The message will be deleted
c)
They will only see the plaintext
d)
They will need the decryption key to understand it
|
|
Yashina Kapoor answered |
If someone intercepts a message encoded with a cipher, they will need the decryption key to convert the ciphertext back into plaintext. Without this key, the message remains unreadable, thus maintaining the confidentiality of the information.
Chapter doubts & questions for Sending Secret Messages - Year 3 Computing IGCSE (Cambridge) 2025 is part of Year 3 exam preparation. The chapters have been prepared according to the Year 3 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Year 3 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Year 3 Computing IGCSE (Cambridge)
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