Computer Information Systems

Question (a) If an intruder happens to see a one-time password, H j ( k ) H^j(k) for some 1 ≤ j < n 1 \leq j < n , what should be the computational task for the intruder to get the next password? To determine the computational task for the intruder to get the next password, H j − 1 ( k ) H^{j-1}(k) , the intruder would need to compute the hash function in reverse. However, hash functions like SHA-3 are designed to be one-way functions, meaning they are computationally infeasible to invert. Therefore, the intruder cannot feasibly compute H j − 1 ( k ) H^{j-1}(k) from H j ( k ) H^j(k) directly due to the one-way property of cryptographic hash functions. The task is computationally infeasible, implying it is practically impossible to obtain the next password H j − 1 ( k ) H^{j-1}(k) if the hash function is secure. Question (b) What is the security problem if the passwords are dispensed in the order that H ( k ) H(k) comes first, then H 2 ( k ) H^2(k) , ⋯ \cdots ⋯ , to H n ( k ) H^n(k) ? If the passwords are dispensed in the order H ( k ) H(k) , H 2 ( k ) H^2(k) , <

Computer science

delete the 1 resistor in the network of Fig. 16.50 and set

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Computer science

Computer science

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