Final Exam Research Paper Example | Topics and Well Written Essays - 1000 words

Final Exam - Research Paper ExampleOn the other hand, bblowfish is a symmetric block cipher and operates in 64-bit block size and a unsettled key length - from 32 bits to 448bits with 16-round Feistel cipher and uses large key-dependent S-boxes. Moreover it encrypts data on a 32-bit central processor at the rate of 18 clock cycles/byte and can run in less than 5K of memory. It is easy to seeThe algorithm used in RC4 initialization phase is a key scheduling algorithm(KSA). This algorithm takes the conundrum key K of length l as the input and begins with the initialization of the internal state S to set it as identity permutation and then uses the key K to generate a random permutation. Thus the algorithm can be summed up asUpon initialization, the internal state S would be 0 1 2 3 N-1. During the next step, the value of j is calculated as j = (j + Si + Ki modern l) mod N. Upon swapping value in Si becomes value in Sj and vice versa.From this, it is clear that, only way to forest all the initial permutation state unchanged is to keep the value of i and j equal. In state to do that, the value of k should be chosen in such a way that, whenever j is calculated using this formula, it always needs to be equal to the value of i.Upon investing the formula, if we make the set within the bracket i.e j = (j + Si + Ki mod l) mod N equal to N+ i, then upon mod the result will be equal to i. Upon analysis, we can say(in this incident)j+i+Ki, since the value of j depends on itself which in turn depends on the previous value of Si (=i) we can say that j will increase to a minimum value of i+(i-1) (Except for i=0) for each iteration. Hence 2i-1+K = N+i. assume N =256, we can say K should be equal to 257-i except for i=0, in which case it can be either 256 or 0 to achieve the desired result. Now K takes resolving It is not possible to perform encryption operations in parallel on multiple blocks of plaintext in DES CBC mode because in