Security

Three security goals are

• confidentiality, cryptography, and nonrepudiation

• confidentiality, encryption, and decryption

• confidentiality, integrity, and availability

• confidentiality, denial of service, and masquerading

Which of the following attacks is threatening integrity?

• Masquerading

• Traffic Analysis

• Denial of service

• Encoding

Which of the following attacks is threatening availability?

• Replaying

• Denial of service

• Decoding

• Modification

__________ means concealing the contents of a message by enciphering.

• Steganography

• Compressing

• Authentication

• Cryptography

In a______character (or a symbol) in the plaintext is always changed to the same character (or symbol) in the ciphertext regardless of its position in the text (choose two)

• Monoalphabetic cipher

• Substitution cipher

• Polyalphabetic cipher

• Transposition cipher

______________means concealing the message by covering it with something else.

• Cryptography

• Steganography

• Compressing

• Authentication

What alternative term can be used to describe asymmetric cryptographic algorithms?

• public key cryptography

• user key cryptography

• private key cryptography

• cipher-text cryptography

cryptography is often used for long messages.

• Symmetric-key

• Asymmetric-key

• Public-key

• Open-key

___________ means that the data must arrive at the receiver exactly as they were sent.

• Nonrepudiation

• Authentication

• Message integrity

• Secrecy

You want a new computer. What can you do to prevent others from accessing your confidential data in this computer?

• Set a user name and password
• Use an uninterruptible power supply (UPS) and a surge protector
• Back up data and save it in a different location
• Install a spyware program and an antivirus program