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Multiple choice › Securing the web

Securing the web

1. Securing the web

What is the main purpose of an SSL/TLS certificate?

  1. To store the user's cookies
  2. To prove the identity of the website and enable an encrypted connection
  3. To validate the HTML
  4. To make the website load faster
Answer

B

Certificates issued by a trusted certificate authority bind a public key to a domain, so browsers can authenticate the server and set up encryption.

2. Securing the web

A digital signature on a document provides:

  1. Anonymity for the sender
  2. Compression of the document
  3. Faster delivery
  4. Authenticity of the sender and integrity of the document
Answer

D

The sender signs a hash of the document with their private key; others verify with the public key. If the document changed, verification fails.

3. Securing the web

Which property of a hash function is demonstrated if changing one letter in a document produces a completely different hash value?

  1. The hash can be reversed to recover the document
  2. Hashes can only be created for text
  3. The hash value grows with the document size
  4. Any change to the input changes the output, so tampering can be detected
Answer

D

Hashes have a fixed-length output and small input changes give very different outputs, which is why they check integrity.

4. Securing the web

Which row correctly matches the term with its meaning?

  1. Encryption key: the data that is being protected
  2. Cipher text: data before encryption
  3. Cipher text: encrypted, unreadable data
  4. Plain text: data that has been encrypted
Answer

C

Plain text is readable data; cipher text is the result of encryption; a key is the secret value used by the algorithm.