Recall & Review
beginner
What is encryption?
Encryption is the process of changing information into a secret code so that only authorized people can read it.
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beginner
What is the difference between plaintext and ciphertext?
Plaintext is the original readable message. Ciphertext is the scrambled, unreadable message after encryption.
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beginner
What is a key in encryption?
A key is a secret value used to lock (encrypt) and unlock (decrypt) the message.
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intermediate
What is symmetric encryption?
Symmetric encryption uses the same key to encrypt and decrypt the message, like a single key for a locked box.
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intermediate
What is asymmetric encryption?
Asymmetric encryption uses two keys: a public key to encrypt and a private key to decrypt, like a mailbox where anyone can drop mail but only the owner can open it.
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What does encryption do to a message?
✗ Incorrect
Encryption changes the message into a secret code so only authorized people can read it.
Which of these is the original readable message?
✗ Incorrect
Plaintext is the original readable message before encryption.
In symmetric encryption, how many keys are used?
✗ Incorrect
Symmetric encryption uses one key for both encrypting and decrypting.
What is the role of the private key in asymmetric encryption?
✗ Incorrect
The private key is used to decrypt messages encrypted with the public key.
Which analogy best describes asymmetric encryption?
✗ Incorrect
Asymmetric encryption is like a mailbox: public key lets anyone encrypt (drop mail), private key lets owner decrypt (open mailbox).
Explain in your own words what encryption is and why it is important.
Think about how you keep your personal diary safe from others.
You got /3 concepts.
Describe the difference between symmetric and asymmetric encryption using simple analogies.
Imagine sharing a key with a friend versus having a public mailbox.
You got /3 concepts.