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  1. Freelancers

Aleksandr Tumanov

Offer Aleksandr work on your next project.

Ukraine Kyiv, Ukraine
7 months 11 days back
Available for hire available for hire
4 Safes completed
4 years back
2 clients
on the service 7 years
Freelancer Aleksandr T. — Ukraine, Kyiv. Core skill — C & C++, C#

Rating

Successful projects
100%
Average rating
No data
Rating
309
C & C++
41 place out of 1370
C#
447 place out of 1198
3 projects
C & C++
2 projects
App Development for Android
1 project
C#
1 project
Cybersecurity & Data Protection

Skills and abilities

Programming

Services

Portfolio


  • Crypto Library with X.509 Certificates

    C & C++
    Projects and Technologies Used:
     digital signature generation, verification, encryption and decryption of data using X.509 certificates;
    support of various certificate chain validation procedures;
    Supporting two methods of identifying subscribers and recipients (Issuer - Serial Number and Subject Key Identifier);
    … use of different modes of selection of the certificate with associated closed key to generate signature;
    use of different methods of assignment of recipients when encrypting data;
    – Generation of attached and detached digital signatures with one or more subscribers;
    Provide different search modes for the signature certificate during the signature check: in local certificate storage, contacting the external DLL, calling the assigned COM object, accessing the Web service that supports the assigned interface;
    - the ability to add the time stamp (RFC3161 "Time-Stamp Protocol (TSP)" and RFC3126 "Electronic Signature Formats for long-term electronic signatures") to the generated signature;
    verification of the signature containing a stamp of time;
    - obtaining signature parameters, as well as attributes for each of the signatories;
    - the inspection of the signature at the given time;
    Work is planned in a multi-way environment.

Reviews and compliments on completed projects 4

8 February 2022 9 USD
C++ Шифрование изменить AES - CBC на ECB

Quality
Professionalism
Cost
Contactability
Deadlines

Changes were needed in a short time.
The work was done quickly and right from the first time.
very satisfied

Pavel Igorenko | Personal | Response review

13 January 2022 180 USD
C++ шифрование для android

Quality
Professionalism
Cost
Contactability
Deadlines

Very pleased with the result, everything was done as proper and clean as possible.
Speed and quality are excellent, all points at the height.

Pavel Igorenko | Personal | Response review

27 December 2021 180 USD
C / C++ Writing the encryption function

Quality
Professionalism
Cost
Contactability
Deadlines

He performed the task quickly and qualitatively, with consultation and pointed out possible problems.

Pavel Igorenko | Safe Safe | Response review

5 October 2020 321 USD
Registration of fiscal checks on the website of tax according to the new API ground

Quality
Professionalism
Cost
Contactability
Deadlines

Everything is cool! There are no questions, everything is done quality, a lot of time has been spent to discuss the topic.

Adam Golovenko | Safe Safe | Response review

Activity

  Latest proposals 10
DesktopApp development Personal project
3000 USD
C++ Шифрование изменить AES - CBC на ECB Personal project
9 USD
C++ шифрование для android Personal project
180 USD
Разработка ПО
56 USD
C / C++ Writing the encryption function
180 USD
Вытащить код формирования хэша блокчейна
1020 USD
Шифрование на С в Visual Studio 2019
11 USD
Приложение защищённой передачи данных по протоколу TLS
338 USD
Разработка Software под задачу
2040 USD
Нужен аудит кода на С++
204 USD