Encryption Algorithms (Symmetric/Asymmetric) CEH Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   In a symmetric encryption system, which statement accurately describes the key used for encryption and decryption?

   • ATwo different keys are used, one for encryption and one for decryption.
   • BThe key is derived from the plaintext during encryption.
   • CThe same key is used for both encryption and decryption.
   • DA public key encrypts and a private key decrypts.
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2. 7application · medium

   A security engineer is evaluating encryption methods for a system that requires both high-speed data encryption and secure key exchange. The system will handle large volumes of data. Which approach best balances performance and security?

   • AUse RSA for both key exchange and data encryption.
   • BUse AES for data encryption and RSA for key exchange.
   • CUse only Diffie-Hellman for all encryption.
   • DUse 3DES for data encryption and ECC for key exchange.
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4. 8foundation · easy

   Which statement correctly compares the speed of symmetric and asymmetric encryption?

   • AThey have similar speeds for large data.
   • BSymmetric encryption is generally faster than asymmetric encryption.
   • CAsymmetric encryption is generally faster than symmetric encryption.
   • DSpeed depends only on key size, not algorithm type.
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5. 9foundation · easy

   Which symmetric algorithm is widely considered the modern standard and supports key sizes of 128, 192, and 256 bits?

   • AAES
   • B3DES
   • CDES
   • DBlowfish
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6. 10application · medium

   A small company needs to encrypt files exchanged with a new business partner. The partner has no existing shared secret, and the two organizations cannot meet in person. The IT lead wants a solution that avoids sending a symmetric key over the internet in plaintext. Which approach should they use?

   • AUse the partner's RSA public key to encrypt a randomly generated AES session key, then send the encrypted files and the encrypted key.
   • BGenerate an AES-256 key, encrypt the files with it, and email the key to the partner in a separate message.
   • CSend the files unencrypted but use a hash to verify integrity after transfer.
   • DEncrypt the files with the partner's RSA public key directly, without using any symmetric algorithm.
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