Free NSE_2 sample questions

Correct answer: Asymmetric Encryption

Asymmetric encryption uses a pair of keys: a public key for encryption and a private key for decryption (or vice versa for signing). This allows for secure communication without sharing a secret key beforehand, unlike symmetric encryption.

Correct answer: Hashing Algorithm

Hashing algorithms (like SHA-256) create a unique fixed-size digest of data. If even a single bit of the data changes, the hash changes drastically (avalanche effect), which is used to verify data integrity.

Correct answer: Certificate Authority (CA)

The Certificate Authority (CA) is the trusted entity that issues digital certificates. The Root CA is the top of the trust hierarchy, and its signature validates the authenticity of the certificates it issues. graph TD RootCA[Root Certificate Authority] -->|Signs| InterCA[Intermediate CA] InterCA -->|Signs| ServerCert[Server Certificate] Client[User Browser] -->|Trusts| RootCA Client -->|Validates| ServerCert

Correct answer: False

False. A digital signature provides authenticity, integrity, and non-repudiation, but NOT confidentiality. It involves hashing the message and encrypting the hash with a private key. The message itself is often sent in plain text unless separately encrypted.

Correct answers: They are computationally faster and more efficient for bulk data; They use a single shared key for both encryption and decryption

Symmetric algorithms (like AES) are much faster than asymmetric ones (like RSA) and are preferred for encrypting large amounts of data.

Symmetric encryption relies on a single shared secret key that must be known by both the sender and the recipient.

Correct answer: Salting

Salting involves adding random data (salt) to a password before hashing it. This prevents attackers from using rainbow tables (pre-computed hash tables) to crack passwords, as the salt makes every hash unique even if two users have the same password.