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Cryptography Upwork freelancers typically receive a client rating of 4.85.

Last updated: October 1, 2015

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Mark Heramis

Mark Heramis

Programmer and SEO

Philippines - Tests: 2 - Portfolio: 1

Hey there! I'm Mark Heramis - your savvy web development specialist. I'm here to help you fire up your business with web based solutions that work like a charm. I share ideas & offer services related to web development, web design, and of course, search engine optimization (SEO). I am open to new technological advancement and can quickly adopt to it. I learn fast, work hard, and pay attendion to details. I am cooperative and is willing to take the extra miles to achieve the expected ends. How to reach me Skype: chum.heramis Email: Time: 4pm - 5am philippine time In case we have incompatible time, you can send me an email to schedule for a discussion.

$5.00 /hr
60 hours

Andrew Grigorev

Andrew Grigorev

Python developer with strong Linux background

Russia - Tests: 3

My career started at the university, in the data center network laboratory. There I became familar with FreeBSD and Linux, TCP/IP networks, and different services and started to use Python for my university tasks. Also, there I became interested in participating in computer security competitions, called CTF, and I have some success in it. Today I'm a professional Python developer working in Yandex, one of the largest Russian IT companies. If you need a Python programmer with great experience of Django, Flask, Tornado and other frameworks, who is familar with MySQL and PostgreSQL databases (but doesn't hesitate to use MongoDB, Redis, etc.) and has strong Linux administration skills - I'm the right person. Basic web-design skills and JavaScript knowledge are included. Also, I have some experience in writing crypto applications. Using Python with M2Crypto or C with OpenSSL or gcrypt.

$16.67 /hr
0 hours

Jorge Lopez

Jorge Lopez

Ethical Hacker and Digital Forensic Investigator

Mexico - Tests: 4

For the past seven years, I have been learning about the information security world, working as an CEH (Certified Ethical Hacker). With some of my co-workers, i have participated in a lot of projects, strictly focused on Information Security. Also, as we evolve and grow in this area, we have trained ourselves in Forensics Sciences, attending clients who need to know what happened after a contingency. I consider myself a self-taught person that likes to grow and that is not afraid of challenges or difficult cases. At this moment my priority is to teach and so much to share the little knowledge I have gained over the years, as well as learn from those who have traveled a different path and with this keep on growing.

$111.11 /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

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

Nathu N.

Nathu N.

Computer Engineer / Software Developer

Philippines - Tests: 16 - Portfolio: 14

Areas of Specialization / Interest: Microprocessors Programming: •PIC (Assembly or C - MPLab) •ATMEL (C Language - Keil uVision) •Arduino (C - Arduino IDE) •Raspberry Pi (Python) Desktop Applications developed in: •Windows -Visual Basic.NET -C#.NET -C/C++ -Java -Python •Linux -Java -C/C++ -Python •Mac -Java -C/C++ -Objective C (Cocoa) -Python Database Implementation -MySQL Malware Analyst Malware Researcher Encryption Enthusiast Software Protection/Security and Licensing Cryptography .NET Reverse Engineering Engineering Applications •Altera Quartus •MultiSIM Circuit Simulation •ARES PCB Design •ISIS Circuit Simulation •MatLab (Matrix Laboratory) •MPLab Website: LinkedIn:

100% Job Success
$20.00 /hr
81 hours