AAA Adrina Arsa Andriy
Contents
To Be Determined
Team Members
- Adrian Sauvageot, Developer
- ...
Progress
Assignment 1
About
Our group has decided to each look at a different programming problem that could be sped up through paralysing it.
Adrian Sauvageot's Findings
Program To Parallelize
I chose to look into a cryptography library. Upon searching for libraries, I was able to find an open source library called CRYPTO++. This library is able to encrypt lines of text, and then decrypt them, based on a key, which is also a string.
The library allows the programmer to select a string. The string would then be secretly shared across two platforms, where it would be stored. The data to be sent would be encrypted on a computer, sent over the network, and then decrypted on the other computer.
I decided to look at the application as if someone was to send a large amount of encrypted data in a large string. To encrypt the string, there is data dependency; encrypting "The Quick Brown Fox Jumped Over The Moon" could give an encrypted code of:
C:ÖÜ+┘~ ╦÷bܼ↨▲+¶.f¾W.▀#§cÆ▼H╣♥¿aOv:Ss╚Ðr│y!%·∟
If you typed the same thing twice, you would get:
C:ÖÜ+┘~ ╦÷bܼ↨▲+¶.f¾W.▀#§cÆ▼H╣♥éý┌ï0샨ï╩↑R┘^õ¡#£2ÌÕøÈ榪ç}FÉñW{òpÂ╩☺üqÿgG‗iã$(♦G]<}*▲`eJÔÓW╗õí
However, it would be possible take a large string, break it into several pieces, and encrypt each piece separately.
For example, if a string was to be broken up after each ".", each part of the large string would be encoded separately, and sent over the network along with a header that contained the strings order. IE:
encryptedPacket{
int id;
string encodedString;
}
The strings could be encoded parallely, and then again decoded parallely.
This would be able to decrease the time taken to encode the strings if they were large. The data would still be encoded while being sent over the network.
Hot Spot Identification By Profiling
In order to identify the hot spots of the program, I used Visual Studio. (Unfortunately, for this library I could not use the Seneca Matrix system, as my account did not have sufficient privileges to install the library.)
This program was called with a very large string that was split into pieces by spiting it on the "."
The explode function (which is a function I created) is the function that splits the string into pieces. This function could be paralleled to speed up the process of spiting up the string. Since this takes almost 20% of the total time it would be worth speeding up.
The other function that takes up a lot of resources is the Cryptopp::StringSource::StringSource function. This is part of the function that takes the String and encodes it. In the StringSource function, the strings that are being encrypted, or decrypted are being copied, being encrypted/decrypted, and stored.
Because the data would be split into smaller pieces by the explode function, this could be paralleled. Since this takes almost 55% of the time of the program, it would be worth speeding up.
