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Eccouncil 212-81 Exam - Topic 5 Question 73 Discussion

John is trying to explain the basics of cryptography to a group of young, novice, security students. Which one of the following most accurately defines encryption?
D) Changing a message so it can only be easily read by the intended recipient
A) Changing a message using complex mathematics
B) Applying keys to a message to conceal it
C) Complex mathematics to conceal a message

Eccouncil 212-81 Exam - Topic 5 Question 73 Discussion

Actual exam question for Eccouncil's 212-81 exam
Question #: 73
Topic #: 5
[All 212-81 Questions]

John is trying to explain the basics of cryptography to a group of young, novice, security students. Which one of the following most accurately defines encryption?

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Suggested Answer: D

Changing a message so it can only be easily read by the intended recipient

https://en.wikipedia.org/wiki/Encryption

Encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information. Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor.


by Ressie at Jun 16, 2026, 04:30 PM

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Heike
4 days ago
A is too vague. Complex math alone doesn’t define encryption well.
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Crissy
9 days ago
I lean towards B. Keys are crucial for concealing messages.
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Maurine
14 days ago
I think D is the best choice. It captures the essence of encryption.
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Annett
19 days ago
B is spot on! Keys are essential for encryption.
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Caitlin
24 days ago
A is too vague, but C sounds pretty accurate too.
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Dortha
30 days ago
Wait, can encryption really be that simple?
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Tasia
1 month ago
I think D is the best answer. Makes the most sense.
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Carry
1 month ago
It's all about keys and concealment!
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Annita
2 months ago
I’m a bit confused; I thought encryption was more about the mathematics involved, so A or C could also be valid, right?
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Apolonia
2 months ago
I practiced a question similar to this, and I think the focus is on the intended recipient being able to read it, so D sounds right to me.
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Sherell
2 months ago
I'm not entirely sure, but I feel like B might be correct since it mentions applying keys, which is a big part of encryption.
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Denae
2 months ago
I think I remember that encryption is about making a message unreadable without the right key, so maybe D is the best choice?
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