Encryption Algorithms (Symmetric/Asymmetric) CEH Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A company is designing a secure file-sharing system. Files are stored encrypted on a server, and users need to share files with each other. The system must support sharing with external partners who do not have accounts. Which encryption approach is most practical?

   • AEncrypt the file with the sender's private key and share the public key with external partners.
   • BUse RSA to encrypt the entire file for each external partner.
   • CUse a single symmetric key for all files and share it with external partners via email.
   • DEncrypt each file with a random symmetric key, and encrypt that key with the public key of each authorized user (including external partners).
   Reveal Solution Discussion Select an answer first
2. 2application · hard

   A security consultant is advising a client on securing a web application that uses TLS. The client wants to ensure forward secrecy, meaning that if the server's long-term private key is compromised, past session keys remain secure. Which key exchange method should the consultant recommend?

   • ARSA key exchange
   • BPre-shared key (PSK)
   • CStatic Diffie-Hellman
   • DEphemeral Diffie-Hellman (DHE or ECDHE)
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A company needs to encrypt emails sent to external clients. The clients do not have a pre-shared key, but they have public certificates. Which encryption method should be used?

   • AAES-256 with a key sent in a separate email
   • BBlowfish with a key exchanged via phone
   • CS/MIME with the recipient's public certificate
   • DRSA-2048 to encrypt the entire email body
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   In a hybrid encryption system, what is the typical role of asymmetric encryption?

   • ATo compress the data before encryption.
   • BTo securely exchange a symmetric session key.
   • CTo encrypt the bulk of the data.
   • DTo replace symmetric encryption entirely.
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   What is a key strength of asymmetric encryption compared to symmetric encryption?

   • AIt simplifies key distribution because public keys can be shared openly.
   • BIt uses shorter keys for the same security level.
   • CIt requires less computational overhead.
   • DIt is faster for encrypting large amounts of data.
   Reveal Solution Discussion Select an answer first