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Write a C program (or a Python program) that can both encryp...

Write a C program (or a Python program) that can both encrypt and decrypt a message using the Caesar Cipher. The program should handle upper/lower cases and non-alphabet characters correctly. That is, upper case letters should be rotated to upper case letters, lower case letters should be rotated to...

Project 4: Web Security Setting Up You are provided with bo...

Project 4: Web Security Setting Up You are provided with both root and regular user access to this virtual machine. The credentials are: Username Password root root user user You should only use the user account to complete the project. root is provided for your convenience in case y...

1. Warm-up: cryptographic hash functions and guessing games,...

1. Warm-up: cryptographic hash functions and guessing games, 5 marks Recall that the parity of an integer N refers to the property of N being even or odd. Suppose Bob is the proud owner of a random number generator that generates truly random integers of arbitrary size and is completely tamper-pr...

Problem 3 — RSA primes too close together, 18 marks) ...

Problem 3 — RSA primes too close together, 18 marks) This problem explores a difference of squares approach to factoring an RSA modulus due to Fermat, and hence also known as Fermat factorization. Fermat’s idea was to attempt to find a representation of an integer n as a difference of...

Programming Problem Problem 9 — A secure password bas...

Programming Problem Problem 9 — A secure password based authentication and key exchange protocol Overview. This problem considers the full, secure version of the password-based key agreement protocol. This protocol, executed by Client and a Server, allows the Client to demonstrate to the S...

Programming Problem Problem 6 — Password attack on a...

Programming Problem Problem 6 — Password attack on an authenticated encryption scheme Overview. Suppose Bob has designed his own authenticated encryption scheme, using the hash then-encrypt paradigm, with AES-128 in CBC mode for encryption, and SHA1 for the key derivation function and mess...

No programs, no calculators in this problem that spoil the f...

No programs, no calculators in this problem that spoil the fun! Working inZ3[x]: (a) Show that f(x) =x⁴+x−1 is irreducible (b) How many elements does the finite field F=Z3[x]/(f(x)) contain? (c) Find the multiplicative inverse of 2x²−x−1 in F.

Explain why the trivial protocol for Alice and Bob to comput...

Explain why the trivial protocol for Alice and Bob to compute f(x,y)=x⨁y, where x,y∈{0,1}, satisfies the definition of secure 2-party computation. The trivial protocol is that Alice sends x to Bob, Bob computes f(x,y) and sends it to Alice.

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