Write some software application

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.

Skills: .NET, C++ Programming, Java, Javascript, Web Security

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About the Employer:
( 5 reviews ) Tampa, United States

Project ID: #13738662

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