Cryptography: Challenge Response System Design

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Hello, To help design a challenge response crypto system. We have gone through your requirements. We are the team of 20+ employees and over past 10 years we have completed 300+ projects in web and mobile application development projects. We work on iOS and Android application development. We are proficient using WordPress, Woocommerce , PSD to HTML5 Responsive Design , HTML5 to Wordpress, PSD to Wordpress , PHP 5, MySql, Ajax, HTML5, CSS3, PSD Website Mockup / Layout Designs ,different APIs and Payment Gateways, CodeIgniter , E-commerce, CMS, Bootstrap. We are 24/7 available. Feel free to reach us for any kind of your job. WE WILL HAPPY TO ASSIST : Thanks Regards, Subha

if you want a .net solution in c# for cryptography , I Am interested to have a chat.

hi i have experience to working on crypto currency please check my website bitrush.nl. i have used multiple api for conversion Pay after satisfaction. I gone through Your project details. I will assure you 100% satisfactory job. As i am having vast experience of 3 years in web development specially on php, mysql and wordpress. Beside doing your job in proffesional manner i may offer you some additional functionality on this. chat once with me before hire anyone. thanks for reading Roshan

I have experience in cryptography and web security and web penetration testing. Still need more details on the project