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On average, 7 Cryptography projects are completed every quarter on Upwork.


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Cryptography Upwork freelancers typically receive a client rating of 4.85.

Last updated: October 1, 2015

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Axel Díaz

Axel Díaz

Python/Django developer senior

Venezuela - Tests: 2 - Portfolio: 2

I am a Computer Engineer in Venezuela, driven by diverse and strong passions. Web developer and programmer of applications usually python / django. Specialist cryptography, electronic certification and security. Enthusiastic, optimistic and open to new experiences and challenges. With over 5 years experience. I have also had the opportunity to work on several ambitious projects in a responsible and dedicated.

$20.00 /hr
0 hours

Déborah Mendes

Déborah Mendes

Master Student - Computer Science


My name is Deborah, I am a master student in Computer Science, I have deep knowledge of PHP, Java, HTML, C, C++ and Lua. I also have experience working with functional languages, such as Haskell and with logic programming, such as Prolog. I have been assistant for the course "Programming Languages" at my University for three years. I am looking for opportunities to work in short to medium sized projects. I can program very fast, so I can deliver projects in short time. I am a native Portuguese speaker from Brazil and I am fluent in English. I am looking for any translation projects related to these languages.

$20.00 /hr
0 hours

Andrei Volkov

Andrei Volkov Agency Contractor

Linux specialist (Sec/Opt/Dev, C/Perl/Python/PHP/BASH)

Belarus - Tests: 5 - Portfolio: 13

Important: ------------------- Enhanced shield of your Web application with mod_security! Should be always. It is task #1 after installation ANY web application! ------------------- About Me and more: ------------------- I have over 16 years of work experience with Linux systems. This is the list of software and technologies with which I deal. This list is not full and expands day by day. I always can find right decisions if I found some problems. And I am always interested in looking for mostly economical and productive solutions. Of course, Cpanel, WHM, Webmin, Plesk .... I know how are working these web-wrappers and I support their. I can will tune and to make the checking of these wrappers. But that more important !! I can work without this))) Directly use configuration files of services and etc etc. Usually, it is better way on dedicated servers. ) TCP, IPv4 , IPv6, IPX ... - WiFi, WEP, WPA, WPA2 ... - SElinux, Apparmor, Smack, Tomoyo ... - LAMP ( Apache, Nginx, PHP, Perl, Mysql, Mongo), REDMINE ... - Cpanel, Zpanel, ISP ... - MySQL clustering and replication DNS servers ... - SENDMAIL, EXIM, POSTFIX (POSTFIXADMIN,MYSQL,DOVECOT,POLICYD) ... - HPC system: Torque, Maui, Moab for HPC clusters, Infiniband, FC interconnect, iSCSI, SCST, DRBD, OFED, OPENMPI ... - OpenLDAP ... - VPN with OpenVPN, PPTP, StrongVPN ... - Nagios, Zabbix, Ganglia, OSSEC ... - SVN, CVS, GIT ... - KVM, Xen, OpenStack, Proxmox ... - NBD, RAID, LVM ... etc etc During these years I have been in a large number of tasks related to administration of network devices, as well as with simple and complex server systems. I manage servers for the HPC tasks and for network infrastructure of Internet and Intranet - DNS,DHCP,*FTP,HTTP(S),MAIL etc etc. The main goals - the monitoring of the performance and the security. I also implement tasks of data backup and troubleshooting, support for the users. I have comprehensive work skills with systems based on Debian, Redhat, CentOS, SLES, OpenSuse. I've got more than 8 years of experience in developing the different software with use of C, Perl, Python, Bash, HTML on system and user levels. For example, very important skill in developing and the modification of RPM packages (rpmbuild, rebuild, kernels), custom kernels and etc etc. ------------------- Often: ------------------- How the standart service for VPS's and VDS's projects and dedicated servers: IDS, IPS, the control of contents of log's files, the control of load of the cpu, the memory, the hard disks; the backups of the databases and the files; install or update software, consultations. Emergency call via sms to cell phone. ------------------- STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. VERY OFFTEN: IF YOURS WP WAS HACKED 1. disable plugins 2. execute # diff -r dir1 dir2 3. repeat for plugins if you have last version of WP code: ~ 80% cases - problems: plugin low quality (look on author: from where and who is) ~ 15% cases - problems: theme low quality (look on author: from where and who is) ~ 5% 0day of WP also you need disable all shell function in php and enable suphp/suexec modes. STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. I am getting a lot questions about reliability and quality distributives/clones Ubuntu. Results on practice - Ubuntu clones - worst for server. It is truth. If you $buntu guy, I can't help you right now. I only can recommend Debian way for server. =============== 3. Nginx of course is good program. For small/middle vps. But in serious projects - apache. Nginx will be suitable for frontend. It is only practice. Always for all web application should be mod_security module. Firewall of level of web application on 7 level of OSI. Each web application/site should be under own user in environment of vps or on dedicated servers. =============== 4. By topic Wordpress. For optimisation services of OS , namely system IO(type of disks or partitions) and DB(type of engines of tables), need to use empty installation (default variants). Most problems of work WP contains in itself - customized plugins or themes. For analyze pages need begin with such services as =============== Sunday - day of rest. Or in emergency case - payment with double rate. best regards, Andrei / PS: With love from USSR. ;-)

Associated with: UPWORK.LINK

100% Job Success
$16.00 /hr
1,023 hours

Dmitry Paramonov

Dmitry Paramonov

Python System/Web Developer

Russia - Tests: 5 - Portfolio: 3

Python is my favourite language and I use it for implementing various system utilities and web backends (with Django framework). I am a server-side guy but despite this I also know how client-side (JavaScript, etc.) stuff works. Besides Python I like functional languages: Haskell, Ocaml, Lisp (Scheme) but they are just my hobby.

100% Job Success
$27.78 /hr
1,765 hours

Charandeep Singh

Charandeep Singh

MCPD, .Net, Java , MVC, Azure, Jquery, Web APIs, Mobile, Development

India - Tests: 1

Myself Deep Kamboj, having more than 14 years of experience in developing full stack applications including Web, Desktop, Web and Windows Services . I have been doing programming in C++, C ,C# , Visual Basic, and Java. I have worked on ASP.NET, MVC, Entity Framework, JQuery and have work on lots of medium to high end users projects. I have worked on different relation database, SQL SERVER and DB2, I am also Microsoft Certified Technology Specialist [MCTS], Sun Certified Java Programmer [SCJP] and Microsoft Certified System Engineer [MCSE].

36% Job Success
$12.50 /hr
224 hours

Girish V.

Girish V.

Perl,node.js and TCP/IP networking expert

India - Tests: 7 - Portfolio: 4

Girish is a seasoned UNIX professional with rich networking experience working with protocols, low level protocols encoding, solving tough interop issues, reading RFCs, implementing standards, working on e-mail spam control, mail servers, firewalls etc. Also have excellent node.js and jquery skills. I am also experienced in MEAN, mongodb, facebook integration, oauth2 et al Specific expertise is on OpenBSD, perl coding, C and web technologies such as jQuery , javascript and products development. Familiar with IPsec, L2TP, OpenVPN, PPTP VPN technologies, spam control, email technologies. Also experienced in security areas, crypto, algorithms and UNIX environment's challenges and technologies. A systems programmer with high focus on programming correctness and efficiency.

74% Job Success
$44.44 /hr
302 hours

Muhammad U.

Muhammad U.

Oracle Siebel CRM, Joomla, Smart Card, Java Card

Pakistan - Tests: 4 - Portfolio: 4

From last 5 years I have been developing tools, working with Enterprise solutions and developing websites for internal and external purpose. I have 03 years of experience working with Oracle Siebel CRM. I have been working in IBM as a Siebel Configurator on a challenging PTCL CRM project. I have complete knowledge of Siebel Configuration, Siebel objects, Siebel Web services, Siebel Integration, Siebel Components, Data Maps, Applets, BCs, Business Services, Workflows, Integration Objects etc I also have vast experience of Smart Card, SIM Card and high-load website projects, I would like to get long-term relations with customers. I am Proficient in client/server applications development and maintenance. Hard-working, Fast Learner with good communication skills. I also possess extensive knowledge in the following areas: Java, Jquery, Java, script, SQL, Ajax, OOP, and software design and testing and quality assurance.

$15.00 /hr
0 hours

Chuen KaLam

Chuen KaLam

iOS/Android/php/ffmpeg/opengl/video streaming/cryptography

Hong Kong - Tests: 12 - Portfolio: 7

Maximum satisfaction to clients. I am an ios & android expert with rich experience and skills for video streaming, video & audio & image processing, chatting, cryptography, etc. I have rich experiences of front-end ecommerce website and back-end web services also. I am a good helper and adviser for your success. And your success is my success too. My main skills are - iOS App Development(Objective C, SWIFT, iOS 8 & 9 UI & features) - Android App Development(JAVA, JNI, Material design) - Web service Development(REST API, PHP, Python, Node.js, Angular js) - PayPal, Strip, Braintree, Apple Pay - Video streaming & processing - OpenGL, Imagemagick, OpenCV - FFmpeg, AVFoundation, MediaCodec, Librtmp, VLC - AWS, Parse, Firebase, Google Platform, iCloud, Dropbox, Pubnub, - Wowza, FMS, Red5

$30.00 /hr
0 hours

Muhammad awais F.

Muhammad awais F. Agency Contractor

C#,VB,VBA, Web Scrapping, Office automation, Website development

Pakistan - Tests: 11 - Portfolio: 11

Over all 12+ years’ experience in Business Analysis, Software Design, Software Development, & Project Management. 7+ year’s extensive experience in enterprise software development using Microsoft’s .NET platform. Completed 23 odesk jobs successfully. Worked more than 1500 hours. Please contact me if you need best results in C# Application Development Visual Basic.NET MS Access and Excel ( office automation and VBA) Visual Basic 6 MS SQL Server (DB Design,Optimization, Stored Procedures etc) ASP.NET PHP Website Scrapping

Associated with: Bitwise Soft

100% Job Success
$15.00 /hr
1,836 hours