Find Jobs
Hire Freelancers

Write some software application

$10-30 USD

Cerrado
Publicado hace casi 7 años

$10-30 USD

Pagado a la entrega
Assigned Project • Secure Instant Point-to-Point (P2P) Messaging • In this project, you need to design a secure instant messaging tool for Alice and Bob (like Gtalk, skype or ICQ chat). The system supports the following functions – Alice and Bob can use the tool to send instant messages to each other. Alice and Bob share the same password (or passphrase), they must use the password to set up the tool to correctly encrypt and decrypt messages shared between each other. – Each message during Internet transmission must be encrypted using a 56-bit key. You can use any computer language (Java, C++, Python) and leverage any existing opensource software, tools, or commands (e.g., md5sum, sha1sum) to design the system. Design Issues • With a 56-bit key, what cipher you should use? • DO NOT directly use the password as the key, how can you generate the same key between Alice and Bob to encrypt messages? • What will be used for padding? A graphical user interface (GUI) is preferred. – Display ciphertext and plaintext • How should Alice and Bob set up an initial connection and also maintain the connection with each other on the Internet? – You may refer to socket/network programming in a particular computer language Extra Credits • Design a key management mechanism to periodically update the key used between Alice and Bob. Justify why the design can enhance security.
ID del proyecto: 13738662

Información sobre el proyecto

5 propuestas
Proyecto remoto
Activo hace 7 años

¿Buscas ganar dinero?

Beneficios de presentar ofertas en Freelancer

Fija tu plazo y presupuesto
Cobra por tu trabajo
Describe tu propuesta
Es gratis registrarse y presentar ofertas en los trabajos
5 freelancers están ofertando un promedio de $99 USD por este trabajo
Avatar del usuario
I am very proficient in c and c++. I have 16 years c++ developing experience now, and have worked for more than 7 years. My work is online game developing, and mainly focus on server side, using c++ under Linux environment. I made many great projects using c++, for example, I made the tools which could convert java codes into c++ scripts, of course garbage collection included, this was very similar to a compiler, and was very complex. I also made our own mobile game using c++, I can show you the demo of client, if you like. I am very proficient in java also. I have a very good review on Freelancer.com, I never miss a project once I accept the job, you can check my review. Trust me, please let expert help you.
$150 USD en 3 días
4,8 (90 comentarios)
6,6
6,6
Avatar del usuario
A proposal has not yet been provided
$277 USD en 3 días
4,9 (4 comentarios)
2,9
2,9
Avatar del usuario
Hello there, I have read the description very precisely and for that I would like to utilize my interpersonal skills and years of experience to get this project done in a mean time as well as in a reasonable budget. I'm a full stack developer having diverse knowledge of front-end and back-end development including Html5 Css3 bootstrap php phpmysql WordPress joomla and all other open source platforms. Quality work is extremely assured. So let's talk..
$15 USD en 1 día
0,0 (0 comentarios)
0,0
0,0

Sobre este cliente

Bandera de UNITED STATES
Tampa, United States
5,0
5
Forma de pago verificada
Miembro desde nov 7, 2016

Verificación del cliente

¡Gracias! Te hemos enviado un enlace para reclamar tu crédito gratuito.
Algo salió mal al enviar tu correo electrónico. Por favor, intenta de nuevo.
Usuarios registrados Total de empleos publicados
Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)
Copyright © 2024 Freelancer Technology Pty Limited (ACN 142 189 759)
Cargando visualización previa
Permiso concedido para Geolocalización.
Tu sesión de acceso ha expirado y has sido desconectado. Por favor, inica sesión nuevamente.