Understanding cryptography even solutions manual Cryptography is the science of secret writing with the goal of hiding the meaning of a message. Cryptanalysis is science and sometimes art of. 8- ANSWERS TO QUESTIONS 2.1 Plaintext, encryption algorithm, secret key, ciphertext, decryption algorithm. 2.2 Permutation and substitution. 2.3 One key for symmetric ciphers, two keys for asymmetric ciphers. 2.4 A stream cipher is one that encrypts a digital data stream one bit or one byte at a time. A block cipher is one in which a block of plaintext is treated as a whole.
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- Exercise 1.5
Exercise 1.5
As we learned in this chapter, modular arithmetic is the basis of many cryptosystems. As a consequence, we will address this topic with several problems in this and upcoming chapters.
Compute the result without a calculator:
- 15 · 29 mod 13
- 2 · 29 mod 13
- 2 · 3 mod 13
- −11 · 3 mod 13
The results should be given in the range from 0,1,…, modulus-1. Briefly describe the relation between the different parts of the problem.
Understanding Cryptography Even Solutions Manual
Solution
This solution is verified as correct by the official Solutions for Odd-Numbered Questions manual.
We can compute these by reducing the individual terms (since all members of an equivalence class behave the same), performing the arithmetic and then reducing the result:
1.
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4.