It is the number of bits (bytes) in the key. It is the number of bits (bytes) in the key



Yüklə 445 b.
tarix17.07.2018
ölçüsü445 b.













































It is the number of bits (bytes) in the key.

  • It is the number of bits (bytes) in the key.

  • A 2-bit key has four values

  • A key of length “n” has a key space of 2^n distinct values.

  • E.g. the key is 128 bits

    • 101010101010….10010101111111
    • There are 2^128 combinations
    • 340 282 366 920 938 463 463 374 607 431 768 211 456






























Examples: DES, RC4, RC5, IDEA, Skipjack

























Symmetric Cipher

  • Symmetric Cipher

  • EK2(M) = C

  • DK2(C) = M

  • With the property that:

  • DK2(EK2(M)) = M

  • And, with different keys (public/private) we have:

  • EK1(M) = C

  • DK2(C) = M

  • DK2(EK1(M)) = M


















Dostları ilə paylaş:


Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©muhaz.org 2017
rəhbərliyinə müraciət

    Ana səhifə