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 variable key length - from 32 bits to 448bits with 16-round Feistel cipher and uses large key-dependent S-boxes. Moreover it encrypts selective information on a 32-bit processor at the rate of 18 clock cycles/byte and can run in less than 5K of memory. It is easy to implementThe algorithmic rule utilize in RC4 low-level formatting phase is a key scheduling algorithm(KSA). This algorithm takes the secret key K of length l as the input and begins with the initialization of the internal state S to set it as identity replacing 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 metric as j = (j + Si + Ki mod l) mod N. Upon swapping value in Si becomes value in Sj and vice versa.From this, it is clear that, only way to keep the initial permutation state unchanged is to keep the value of i and j equal. In order to do that, the value of k should be chosen in much(prenominal) 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 values within the angle 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 case)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 increment to a marginal value of i+(i-1) (Except for i=0) for each iteration. Hence 2i-1+K = N+i. Assuming N =256, we can say K should be equal to 257-i pull out for i=0, in which case it can be either 256 or 0 to achieve the desired result. Now K takesAnswer It is not potential to perform encryption operations in parallel on multiple blocks of plaintext in DES CBC mode because in