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NEW QUESTION: 1
The Data Encryption Standard (DES) encryption algorithm has which of the following characteristics?
A. 64 bits of data input results in 56 bits of encrypted output
B. 64 bit blocks with a 64 bit total key length
C. 128 bit key with 8 bits used for parity
D. 56 bits of data input results in 56 bits of encrypted output
Answer: B
Explanation:
DES works with 64 bit blocks of text using a 64 bit key (with 8 bits used for parity, so
the effective key length is 56 bits).
Some people are getting the Key Size and the Block Size mixed up. The block size is usually a
specific length. For example DES uses block size of 64 bits which results in 64 bits of encrypted
data for each block. AES uses a block size of 128 bits, the block size on AES can only be 128 as
per the published standard FIPS-197.
A DES key consists of 64 binary digits ("0"s or "1"s) of which 56 bits are randomly generated and
used directly by the algorithm. The other 8 bits, which are not used by the algorithm, may be used
for error detection. The 8 error detecting bits are set to make the parity of each 8-bit byte of the
key odd, i.e., there is an odd number of "1"s in each 8-bit byte1. Authorized users of encrypted
computer data must have the key that was used to encipher the data in order to decrypt it.
IN CONTRAST WITH AES
The input and output for the AES algorithm each consist of sequences of 128 bits (digits with
values of 0 or 1). These sequences will sometimes be referred to as blocks and the number of bits
they contain will be referred to as their length. The Cipher Key for the AES algorithm is a
sequence of 128, 192 or 256 bits. Other input, output and Cipher Key lengths are not permitted by
this standard.
The Advanced Encryption Standard (AES) specifies the Rijndael algorithm, a symmetric block
cipher that can process data blocks of 128 bits, using cipher keys with lengths of 128, 192, and
256 bits. Rijndael was designed to handle additional block sizes and key lengths, however they
are not adopted in the AES standard.
The AES algorithm may be used with the three different key lengths indicated above, and
therefore these different "flavors" may be referred to as "AES-128", "AES-192", and "AES-256".
The other answers are not correct because:
"64 bits of data input results in 56 bits of encrypted output" is incorrect because while DES does
work with 64 bit block input, it results in 64 bit blocks of encrypted output.
"128 bit key with 8 bits used for parity" is incorrect because DES does not ever use a 128 bit key.
"56 bits of data input results in 56 bits of encrypted output" is incorrect because DES always works
with 64 bit blocks of input/output, not 56 bits.
Reference(s) used for this question:
Official ISC2 Guide to the CISSP CBK, Second Edition, page: 336-343 http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf

NEW QUESTION: 2
A developer wants to be able to re-use a gross profit calculation in multiple builds. What should be created?
A. Derivation
B. User-defined function
C. Attribute
D. Measure
E. Derived dimension
Answer: B

NEW QUESTION: 3
Define the Marketing User Profile.
A. Standard user perm + can import leads for the Org
Answer: A