Eccouncil Exam 312-50 Topic 2 Question 105 Discussion

Actual exam question for Eccouncil's 312-50 exam

Question #: 105
Topic #: 2

Harper, a software engineer, is developing an email application. To ensure the confidentiality of email messages. Harper uses a symmetric-key block cipher having a classical 12- or 16-round Feistel network with a block size of 64 bits for encryption, which includes large 8 x 32-bit S-boxes (S1, S2, S3, S4) based on bent functions, modular addition and subtraction, key-dependent rotation, and XOR operations. This cipher also uses a masking key(Km1)and a rotation key (Kr1) for performing its functions. What is the algorithm employed by Harper to secure the email messages?

ACAST-128

BAES

CGOST block cipher

DDES

Show Suggested Answer

Suggested Answer: A

by Wilson at Apr 05, 2025, 04:26 PM

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Shala

8 days ago

Wait, is this a trick question? I bet the answer is 'All of the above' and Harper is actually using a top-secret, government-grade encryption algorithm that's a mix of everything!

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Tamar

19 days ago

Hmm, this sounds like a fancy version of good old DES. I'm going to have to go with option D on this one.

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Claribel

20 days ago

Ooh, the masking key and rotation key make this one tricky. I'm going to say GOST block cipher, as it's a lesser-known algorithm that uses similar techniques.

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Coral

22 days ago

Haha, this question is a bit of a brain-teaser! I'm going to go with AES, as it's the current industry standard for symmetric-key encryption.

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Elmer

2 months ago

Sounds like a pretty complex encryption algorithm! I think it's CAST-128, as it fits the description of a 12- or 16-round Feistel network with 64-bit blocks and large S-boxes.

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