

Articles
by
Y. Talwar 
Total Records (
2 ) for
Y. Talwar 





Y. Talwar
,
C.E.Veni Madhavan
and
Navin Rajpal


RijndaelThe AES^{[13]} is 128bit block cipher based on an elegant algebraic structure over F_{2}^{8}. This cipher employs a simple approach to its substitution, permutation (SP) operations. We take a close look at its internals; the byte substitution transformation function is the only nonlinear function in Rijndael  The AES. This transformation comprises of two steps operating on each byte. Here we are trying to remodel this to one step operation using indicator vector matrix representation. This representation is further extended to mathematically represent one complete encryption or decryption round of Rijndael the using indicator vector matrix representation that can be explored for better cryptoanalysis^{[4,5]} of the cipher. 




Y. Talwar
,
C.E. Veni Madhavan
and
Navin Rajpal


RijndaelThe AES is 128bit block cipher based on an elegant algebraic structure over F_{2}^{8}. This cipher employs a simple approach to its substitution, permutation (SP) operations. We take a close look on the Key Expansion Mechanism of Rijndael  The AES. This study highlights on the presence of the cascading effect in its key expansion mechanism. Thus, lowering the bruteforce key guess attack by a factor of 2^{31}. Hence, for the key size of 128 bits the key diversity is 2^{97} instead of 2^{128}. 





