Ensuring the Confidentiality of Nuclear Information at Cloud Using Modular Encryption Standard

Table 3

Comparative analysis.

Algorithm	Alg. structure	Key size	Block size	Rounds	S-box	Round modules (functions)	Key transformation/scheduling	Differentiating factors	Identification	Classification
DES [6]	Feistel structure	56 bits	64	16	8	Permutation, expansion, substitution	Permutation based	No key encryption, a single type of key	No	No
3DES [7]	Feistel structure	112/168 bits	64	48	8	Permutation, expansion, substitution	Permutation based	No key encryption, a single type of key	No	No
AES [8]	Substitution-permutation	128, 192, 256 bits	128	10, 12, 14	1	Shift rows, mix column, add keys	S-box based	No key encryption, three types of keys	No	No
Blowfish [8]	Feistel structure	32–448 bits	64	16	4	Substitution, swapping	Permutation, substitution based	No key encryption	No	No
RC5 [9]	Feistel structure	64	128	20	8	XOR, left rotation, right rotation	“Magic constant” utilization	No key encryption	No	No
MES (proposed)	Substitution -permutation	128, 160, 192, 224, 256 bits	56 bits by extender/contractor module	9	1	Even and odd round permutation; substitution, shifting, key addition	Contraction, mathematical operations, encryption	Key encryption, five types of keys	Yes	Yes