Cryptography algorithms

Two cryptography algorithms DES(Not 3DES) and AES algorithms should be implemented in four modes Electronic Code Book(ECB), Cipher block Chaining(CBC),Output feedback mode(OFB), Counter Mode(CTR). Initially when executing program the user gives message from the command prompt [url removed, login to view] program should allow the user to select one of the two algorithms and after selecting it should ask for the mode. Then for the given input message it should give the Encrypted and decrypted message. Key is randomly generated by the program.


1) No need of GUI.

2) InitializationVector(IV) is also randomly generated by program.

3) Cryptography related libraries can't used as the user need to change the S-BOX values

Skills: Java, Python

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About the Employer:
( 1 review ) Denton, United States

Project ID: #6515603

9 freelancers are bidding on average $86 for this job


Hi Sir, I am ready to work for you.I have 9 years of experience in C/C++, python , java, PHP and, MySQL. please see some of my works also check my reviews you will get better idea about my skill.I deliver quality work More

$105 USD in 3 days
(149 Reviews)

Hello, I am oracle certified professional java programmer and I have [login to view URL], I am ready to help you, thanks

$100 USD in 3 days
(96 Reviews)

I can write a DES and AES encryption routine from scratch for you, and annotate important algorithm points like sboxes. Should have it done within a day or two.

$111 USD in 1 day
(33 Reviews)

Hi, I'm interested. I can delivery in 3 days and I will fulfill all your requirement. Thanks, Howie

$83 USD in 3 days
(10 Reviews)

A proposal has not yet been provided

$100 USD in 3 days
(5 Reviews)

Hi, I'm a very experienced developer. Studied high school for gifted students in math & university in computer science, I know what I should do. Just give me the job and get it done.

$50 USD in 3 days
(1 Review)

Dear Prospect Hiring Manager. Thank you for giving me a chance to bid on your project. i am a serious bidder here and i have already worked on a similar project before and can deliver as u have mentioned I have More

$100 USD in 5 days
(0 Reviews)

Đề xuất vẫn chưa được gửi

$70 USD in 3 days
(0 Reviews)

hello sir, I will be able to do the project in given time . Please do consider the bid. With regards, N L Ramachandrachudamani

$77 USD in 3 days
(0 Reviews)

As a student of Information Technology I've completed full time course on Cryptography and Computer Security. I am also good at Python and Java/ I've already done similar works for my projects. So I think I am perfect More

$55 USD in 2 days
(0 Reviews)

I'm ready to begin your project. It is almost ready in my archive. I can do it in C or in VB.NET. You will be satisfied.

$50 USD in 1 day
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A proposal has not yet been provided

$133 USD in 3 days
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