A level CS Unit 17 Security

What is meant by the term cipher when used in cryptography?

• an encryption or decryption algorithm
• an encrypted message
• a type of session key
• a digital signature
• text following an encryption algorithm

When carrying out asymmetric encryption, which of the following users would keep the private key?

• the sender
• the receiver
• both sender and receiver
• all recipients of the message
• none of the above

In cryptography, which of the following is the term used to describe the message before it is encrypted?

• simpletext
• plaintext
• notext
• ciphertext
• firsttext

Which of the following is the biggest disadvantage of using symmetric encryption?

• it is very complex and time consuming
• it is rarely used any more
• the value of the key reads the same in both directions
• it only works on computers with older operating systems
• there is a security problem when transmitting the secret key

Which of the following is the correct name for a form of encryption in which both the sender and the recipient use the same key to encrypt/ decrypt?

• symmetric key encryption
• asymmetric key encryption
• public key encryption
• same key encryption
• block cipher encryption

Which of the following is involved in temporary key generation?

• session keys
• private key and certificate
• public key and certificate
• master keys
• public keys

Which of the following is a correct statement about PKIs?

• they use private and public keys but not digital certificates
• they use digital signatures and public keys
• they are a combination of digital certificates, public key cryptography and CAs
• they use asymmetric keys, hashing algorithms and certificate authorities
• they are a combination of digests, hashing algorithms and asymmetric cryptographic algorithms

SSL provides which of the following?

• message integrity only
• confidentiality only
• compression and authentication
• message integrity, confidentiality and compression
• authentication, encryption and digital signatures

Which of the following indicates a secure website?

• http and closed padlock
• http and open padlock
• https and closed padlock
• https and open padlock
• green closed padlock only

Which of the following is not part of security?

• non-repudiation
• bit streaming
• data integrity
• data privacy
• user authentication