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If one round of encryption is performed each clock cycle, then we can say that 64 bits of data are encrypted in 16 clock cycles. If you spot any mistakes, please leave a comment in the Disqus box at the bottom of the page.ġ. I haven’t yet verified this solution independently.

What clock frequency is required for encrypting a fast network link running at a speed of 1 Gb/sec? What is the clock frequency if we want to support a speed of 8 Gb/sec?.

Ignore the time needed for the initial and final permutation. Develop an expression for the required clock frequency for encrypting a stream of data with a data rate r.

Let’s assume that one core iteration can be performed in one clock cycle.

(An alternative approach would be to build a hardware pipeline with 16 stages, resulting in 16-fold increased hardware costs.) This hardware kernel is then used 16 consecutive times in order to generate the encrypted output. The speed of a DES implementation is mainly determined by the time required to do one core iteration. In this problem we want to study the clock frequency requirements for a hardware implementation of DES in real-world applications. Then \[y^\prime = DES_\) will be the complement of what it would have received had the key and input not been bitwise inverted before encryption, since we know that the final round will produce output with this property.Cryptography understanding-cryptography even-numbered-solutions

Return to index Exercise 4.1 Exercise 4.2 Exercise 4.3 Exercise 4.4 Exercise 4.5. cryptography understanding-cryptography even-numbered-solutions. We denote the bitwise complement of a number \(A\) (that is, all bits are flipped) by \(A^\prime\). Understanding Cryptography by Christof Paar and Jan Pelzl - Chapter 4 Solutions - Ex4.6 Sunday. We investigate the property in this problem.

Cryptography understanding-cryptography even-numbered-solutionsĭES has a somewhat surprising property related to bitwise complements of its inputs and outputs.