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

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

Which of the following is not part of security?

• non-repudiation

• bit streaming

• data integrity

• data privacy

• user authentication

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