Private-key cryptography: Block ciphers Flashcards
1
Q
product cipher
A
combines 2 or more components with the intention of producing a cipher that is more secure than the basic parts it is made of.
2
Q
iterated block cipher
A
a block cipher that is made up from:
A key schedule of Nr round keys (k^1
3
Q
festal cipher
A
iterated cipher in which the state in round I is divided into two halves of equal length (L & R)
L(i)=R(i-1)
R(i)=L(i-1) + f(R(i-1,k)
4
Q
weak key
A
a key in which e(e(x))=x
5
Q
semi-weak key pair
A
e_k1(e_k2(x))=x
6
Q
modes of operation
A
ECB
CBC
OFB
CFB
