PHP implementation of the RSA algorithm, how to deal with

PHP Implementation of RSA algorithm
Into the company internship one months, do PHP interns, every day in the study, but immediately to do graduation thesis, really can not draw time, now will be the subject of the sun:
Design and implementation of secure Web service based on public key cryptography
Describe:
Web server is the core of intranet Web site, the data of which is very important, once destroyed will cause irreparable damage to the enterprise, good management, good use, protect the resources in the Web server, is a vital task.
In order to ensure the security of Web services, the use of encrypted communication between the server and the browser can be used to verify the identity of the other party through the digital certificate.
Task:
1, familiar with the RSA algorithm in the public key cryptography system;
2, through the programmatic way to achieve secure communication between the Web server and the browser, the function to realize the exchange of public keys, to achieve all the information encrypted transmission;
3, can use the Protocol Analyzer to capture and compare encryption and encryption before the message.
I want to do it in PHP, but I don't know where to start,
I hope everyone to help, brainstorming, what methods have told me, thank you!

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Http://dev.csdn.net/htmls/73/73122.html
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2, through the programmatic way to achieve secure communication between the Web server and the browser, the function to realize the exchange of public keys, to achieve all the information encrypted transmission;
This can be implemented with HTTPS.

3, can use the Protocol Analyzer to capture and compare encryption and encryption before the message.
Using PHP to catch the message, may not be able to achieve AH, this has C # or C + +
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discuss
Into the company internship one months, do PHP interns, every day in the study, but immediately to do graduation thesis, really can not draw time, now will be the subject of the sun:
Design and implementation of secure Web service based on public key cryptography
Describe:
Web server is the core of intranet Web site, the data of which is very important, once destroyed will cause irreparable damage to the enterprise, good management, good use, protect the resources in the Web server, is a vital task.
In order to ensure the security of Web services, you can use the server and browse ...

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