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asymmetric-cryptography's Introduction

C/C++ CI

Estudo de Criptografia Assimetrica

Trabalho da cadeira de Laboratório de Programação UERJ 2020.1

O que é

O objetivo desse trabalho é fornecer um programa que gere chaves públicas e privadas a partir de dois numeros primos quaisquer, e de posse destas chaves seja capaz de criptografar uma mensagem fornecida como entrada e porsteriormente descriptografa-la.

How to

Compilar os arquivos cripto.c e geranum.c utilizando o comando abaixo:

gcc cripto.c -o cripto -lm -std=c99 -Wall -Werror -pedantic && gcc geranum.c -o geranum -lm -std=c99 -Wall -Werror -pedantic

geranum

O programa geranum recebe dois numeros primos como parametros de entrada. Ex: ./geranum 13 17

Como resposta serão gerados dois arquivos contendo a chave pública (numcripto.txt) e chave privada (numdescripto.txt).

cripto

O programa cripto pode receber duas oções:

  • '-d' Descriptografa a mensagem fornecida como entrada.
  • '-c' Criptografa a mensagem fornecida como entrada. Obs.: Para que o programa possa ser executado, é necessário ter gerado antes as chaves de criptografia através de geranum Ex: ./cripto -c < mensagem.txt > saida.crp

./cripto -d < saida.crp > saida.txt

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