Question: Question 9 Digital signatures do not allow for: Unauthorized modification to a message Third-party verification of a sender Confidentialty of a document Authentication of the

Question 9

Digital signatures do not allow for:

Unauthorized modification to a message

Third-party verification of a sender

Confidentialty of a document

Authentication of the sinatory

Question 1

The DES algorithm uses a series of ------------- on blocks of 64 bits using a 64 bit key.

additions

permutations and substitutions

divisions

multiplications

Question 2

Which of the following encryption algorithm uses variable block size, key size and number of rounds?

IDES

RC5

AES

BLOWFISH

Question 3

Which of the following does support variable block sizes?

RC5

Rijndael

IDEA

Triple-DES

Question 4

Which of the following is a passive attack?

Release of message content

Data Modification

Data Delay

Data Copy

Question 5

Which of the following is not commonly used by encrytion systems?

		Transformation
		Diffusion
		Transposition
		Substitution

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