INTRODUCTION TO CRYPTOGRAPHY An Introduction To Ma
INTRODUCTION TO CRYPTOGRAPHY An Introduction to Ma
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INTRODUCTION TO CRYPTOGRAPHY An Introduction to Mathematical Cryptography Solutions Manual PDF
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INTRODUCTION TO CRYPTOGRAPHY An Introduction to Ma
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INTRODUCTION TO CRYPTOGRAPHY An Introduction To Ma
INTRODUCTION TO CRYPTOGRAPHY An Introduction to Mathematical Cryptography Solutions Manual PDF
Subordinate CA - ANSWER-Issues certificates to users & computers on behalf of the root CA.
Substitution - ANSWER-Changing some part of the plaintext for a different value.
INTRODUCTION TO
CRYPTOGRAPHY An
Introduction to Mathematical
Cryptography Solutions
Manual PDF
Subordinate CA - ✔✔✔ANSWER-Issues certificates to users & computers on
behalf of the root CA.
Substitution - ✔✔✔ANSWER-Changing some part of the plaintext for a different
value.
,Symmetric Algorithms - ✔✔✔ANSWER-Operate with a single cryptographic key
that is used for both encryption and decryption of the message. Examples are DES,
3DES, DESX, AES, Blowfish, Serpent, Twofish, Skipjack, IDEA
synchronous - ✔✔✔ANSWER-Encryption or decryption is performed
immediately - typically used with stream ciphers.
p12 - ✔✔✔ANSWER-Which extension designates a file containing a password-
protected private key?
.cer
.pem
.p7b
.p12
( X mod P, X mod Q) - ✔✔✔ANSWER-How is X mod N if N = PQ represented in
number theory?
(((( A- B)( Q − 1 mod Q))mod Q) Q+ B )mod P
( P mod X, Q mod X)
(((( A+ B)( Q − 1 mod P))mod P) Q+ B )mod P
( X mod P, X mod Q)
128 - ✔✔✔ANSWER-Which block size does the Advanced Encryption Standard
(AES) use?
64
128
192
, 256
3DES (Triple DES) - ✔✔✔ANSWER-Symmetric Key Algorithm, Applies DES
three times, 168-bit key (+24 for parity)
443 - ✔✔✔ANSWER-Which port does Secure Socket Tunneling Protocol (SSTP)
use?
ADFGVX Cipher - ✔✔✔ANSWER-Invented by Colonel Fritz Nebel in 1918. It is
a 6x6 grid with ADFGVX at the top of each column and beginning of each row.
The 26 letters and numbers 0-10 are placed randomly on the table. You then
replace each character of your message with two characters which are represented
by the column followed by the row each character is present in.
Advanced Encryption Standard (AES) - ✔✔✔ANSWER-It is not a Feistel cipher.
The subsequent rounds are similar. The plaintext comes in as 16 bytes (128 bits) at
the very top. The first operation is to XOR the plaintext with 16 bytes of round key.
This is shown by the ⊕ operators; the key bytes come into the side of the XORs.
Each of the 16 bytes is then used as an index into an S-box table that maps 8-bit
inputs to 8-bit outputs. The S-boxes are all identical. The bytes are then rearranged
in a specific order that looks a bit messy but has a simple structure. Finally, the
bytes are mixed in groups of four using a linear mixing function. The term linear
just means that each output bit of the mixing function is the XOR of several of the
input bits.
A symmetric cipher that was approved by the NIST in late 2000 as a replacement
for DES.
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