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312-50V13 · Question #409

312-50V13 Question #409: Real Exam Question with Answer & Explanation

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Submitted by andreas_gr· Mar 6, 2026Cryptography

Question

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?

Options

  • ACAST-128
  • BAES
  • CGOST block cipher
  • DDES

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Topics

#symmetric encryption#block cipher#Feistel network#CAST-128
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