CRYPTO
1992
Springer
13 years 9 months ago
1992
Springer
We prove that the set of DES permutations (encryption and decryption for each DES key) is not closed under functional composition. This implies that, in general, multiple DES-encry...
ITCC
2005
IEEE
13 years 10 months ago
2005
IEEE
As a general design criterion, a symmetric key cipher should not be closed under functional composition due to the implications on the security of the cipher. However, there are s...