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1)What are the six principle elements of a public-key cryptosystem? 2)What are three broad categories of applications of public-key cryptosystems? 3)What is a function that maps a domain into a range

1)What are the six principle elements of a public-key cryptosystem?

2)What are three broad categories of applications of public-key cryptosystems?

3)What is a function that maps a domain into a range such that every function value has a unique inverse, with the condition that the calculation of the function is easy where as the calculation of the inverse is infeasible?

4)What is a function that is easy to calculate in one direction and infeasible to calculate in the other direction unless certain addi tional information is known?

5)In a public-key system using RSA,you intercept the ciphertextC = 10 sent to a user whose public key is e = 5, n = 35. What is the plaintextM?

6)In an RSA system,the public key of a given user is e =31,n =3599.What is the private key of this user?

Hing: First us trial and error to determine p and q; then use the extended Euclidean algorithm to find the multiplicative inverse of 31 modulo φ(n).

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