Symmetric Cryptography - Courses
Symmetric Cryptography - Courses
Symmetric Cryptography - Courses
SHOW LESS
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Random Permutation (Block Cipher)<br />
• In<br />
• fixed size short string (plaintext) M,<br />
• DES -- 64 bits<br />
• Key K<br />
• Out<br />
• same fixed size short string<br />
(ciphertext) C<br />
Friday, September 28, 2012<br />
as Random Oracle<br />
13<br />
Queries<br />
Responses<br />
Notation<br />
! C = { M } K<br />
! M = { C } K<br />
Properties<br />
! Invertible<br />
K 1<br />
K 2<br />
13
Change language