Crystal Business Center

ул. "Осогово" 40, Sofia, Bulgaria, 1303

Crystal Business Center is located in the central part of Sofia, on the corner of "Osogovo" street. and "Todor Aleksandrov...

Subcategories (9)

Image for Open Source Intelligence (OSINT) category
Open Source Intelligence (OSINT)
Image for Information System Security category
Information System Security
Image for Security Management category
Security Management
Image for Corporate Compliance category
Corporate Compliance
Image for CCSK category
CCSK
Image for Information Security Risk category
Information Security Risk
Image for Cyber Warfare category
Cyber Warfare
Image for Hands on Security category
Hands on Security
Image for Secure Code category
Secure Code

Explore Our Courses

CISM - Certified Information Security Manager

 28 Hours
Description: Disclaimer: Please be advised that this updated CISM exam content outline is applicable to exams starting 1 June 2022. CISM® is the most prestigious and demanding qualification for Information Security Managers around the globe today. This qualification provides you with a platform to become part of an elite peer network who have the ability to constantly learn and relearn the growing opportunities/ challenges in Information Security Management. Our CISM training methodology provides an in-depth coverage of contents across the Four CISM domains with a clear focus on building concepts and solving ISACA released CISM exam questions. The course is an intense training and hard-core exam preparation for ISACA’s Certified Information Security Manager (CISM®) Examination. Our instructors encourage all attending delegates to go through the ISACA released CISM QA&E (Questions, Answers and Explanations) as exam preparation - you get this FREE as part of our course. The QA&E is exceptional in helping delegates understand the ISACA style of questions, approach to solving these questions and it helps rapid memory assimilation of the CISM concepts during live classroom sessions.
All our trainers have extensive experience in delivering CISM training. We will thoroughly prepare you for the CISM examination. Goal: The ultimate goal is to pass your CISM examination first time. Objectives:
  • Use the knowledge gained in a practical manner beneficial to your organisation
  • Establish and maintain an Information security governance framework to achieve your organization goals and objectives
  • Manage Information risk to an acceptable level to meet the business and compliance requirements
  • Establish and maintain information security architectures (people, process, technology)
  • Integrate information security requirements into contracts and activities of third parties/ suppliers
  • Plan, establish and manage the capability to detect, investigate, respond to and recover from information security incidents to minimize business impact
Target Audience:
  • Security professionals with 3-5 years of front-line experience
  • Information security managers or those with management responsibilities
  • Information security staff, information security assurance providers who require an in-depth understanding of information security management including: CISO’s, CIO’s, CSO’s, privacy officers, risk managers, security auditors and compliance personnel, BCP / DR personnel, executive and operational managers responsible for assurance functions
Read more...

Cloudflare Essentials: CDN, Security, and DDoS Mitigation

 14 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at beginner to intermediate-level system administrators and security professionals who wish to learn how to implement Cloudflare for content delivery and cloud security, as well as mitigate DDoS attacks. By the end of this training, participants will be able to:
  • Configure Cloudflare for their websites.
  • Set up DNS records and SSL certificates.
  • Implement Cloudflare for content delivery and caching.
  • Protect their websites from DDoS attacks.
  • Implement firewall rules to restrict traffic to their websites.
Read more...

Automotive Cyber Security Fundamentals

 21 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at engineers who wish to safeguard connected vehicles from cyber attacks.By the end of this training, participants will be able to:
  • Implement cybersecurity in automotive systems.
  • Choose the most suitable technologies, tools, and approaches.
Read more...

Business Continuity Practitioner

 14 Hours
This course is designed to help the attendee to build organizational resilience against a range of threats so that organizations can respond effectively to incidents, maintain the availability of business operations and safeguard its interests. 
Read more...

BeyondCorp: Implementing Zero Trust Security

 14 Hours
BeyondCorp is an open source Zero Trust security framework that allows employees to work securely from any location without the need for a traditional VPN. In this instructor-led, live training, participants will learn hands-on how to set up a Zero Security system as they set up and deploy BeyondCorop in a live-lab environment. By the end of this training, participants will be able to:
  • Assess their organization's existing security model.
  • Shift access controls from the perimeter to individual devices and users.
  • Deploy applications using a user and device-centric authentication and authorization workflow.
  • Understand, plan and implement a Zero Trust network within their organization.
Audience
  • Network engineers
  • Cyber security professionals
  • System architects
  • IT managers
Format of the Course
  • Part lecture, part discussion, exercises and heavy hands-on practice
Note
  • To request a customized training for this course, please contact us to arrange.
Read more...

CAS for Administrators

 7 Hours
In this instructor-led, live training Sofia (online or onsite), we discuss CAS's architecture and features and practice installing and configuring a CAS server. By the end of this training, participants will be able to:
  • Have an understanding of CAS's implementation of SSO (Single-Sign-On Authentication).
  • Have the necessary practice to deploy and manage their own authentication server.
Read more...

Crypto Currencies and the Blockchain

 7 Hours
This course help you to understand what is special about Bitcoin, we need to understand how it works at a technical level. We’ll address the important questions about Bitcoin, such as:
How does Bitcoin work? What makes Bitcoin different? How secure are your Bitcoins? How anonymous are Bitcoin users? What determines the price of Bitcoins? Can cryptocurrencies be regulated? What might the future hold?   
 
Read more...

Cyber Crisis & Communications Planning

 7 Hours
This course discusses how to manage an incident response team, how the first responder act, given the frequency and complexity of today's cyber attacks, incident response is a critical function for organizations. Incident response is the last line of defense, detecting and efficiently responding to incidents requires strong management processes, and managing an incident response team requires special skills and knowledge
 
Read more...

Cyber Crime in Business

 7 Hours
This one day course show the cyber crime impact on the business and how the hackers can effect the business through the cyber crimes, the course discuss the history of cyber crime and security terminologies of the hacking and cyber security, finally it will discuss how to stop this risk on the business    
    
 
Read more...

Cyber Defence (SOC) Analyst Foundation

 7 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at beginner to intermediate-level security analysts and system administrators who wish to establish a foundational understanding of Cyber Defence (SOC) analysis. By the end of this training, participants will be able to:
  • Understand the principles of Security Management in a Cyber Defence context.
  • Execute effective Incident Response strategies to mitigate security incidents.
  • Implement Security Education practices to enhance organizational awareness and preparedness.
  • Manage and analyze Security Information for proactive threat identification.
  • Utilize Event Management techniques to monitor and respond to security events.
  • Implement Vulnerability Management processes to identify and address system vulnerabilities.
  • Develop skills in Threat Detection to identify and respond to potential cyber threats.
  • Participate in Simulated Attacks to test and improve incident response capabilities.
Read more...

Certified Information System Security Professional (CISSP) CBK Review

 35 Hours
A CISSP is an information assurance professional who defines the architecture, design, management and/or controls that assure the security of business environments. The vast breadth of knowledge and the experience it takes to pass the exam is what sets a CISSP apart. The credential demonstrates a globally recognized level of competence provided by the (ISC)2® CBK®, which covers critical topics in security today, including cloud computing, mobile security, application development security, risk management and more. This course helps you review the 10 domains of the information security practices. It also serves as a strong learning tool for mastering concepts and topics related to all aspects of information systems security. Objectives:
  • To review of the main topics of CISSP CBK (Common Body of Knowledge).
  • To prepare for a CISSP examination
Read more...

Cloud Security Seminar

 7 Hours
  • After this one day seminar the attendee will be able to demonstrate knowledge and understanding of Cloud Computing.
Read more...

Capture the Flag (CTF)

 14 Hours
This class will help the attendees to scan, test, hack on secure their own systems, get in-depth knowledge and practical experience with the current essential security systems. the attendees know how perimeter defenses work and then be lead into scanning and attacking their own networks, no real network is harmed, the attendees then will learn how intruders escalate privileges and what steps can be taken to secure a system, Intrusion Detection, Policy Creation, Social Engineering, DDoS Attacks, Buffer Overflows and Virus Creation.    
 
Read more...

Cyber Emergency Response Team (CERT)

 7 Hours
This course discusses how to manage an incident response team. how the first responder act, given the frequency and complexity of today's cyber attacks, incident response is a critical function for organizations. Incident response is the last line of defense, detecting and efficiently responding to incidents requires strong management processes, and managing an incident response team requires special skills and knowledge
Read more...

Managing Cyber Risks in the Supply Chain

 7 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at supply chain professionals who wish to establish effective control and oversight of their supply chain, especially as it relates to cybersecurity. By the end of this training, participants will be able to:
  • Understand the security oversights that can bring about significant damage and disruption to a supply chain.
  • Break down a complex security problem into manageable and actionable parts.
  • Address common supply chain vulnerabilities by analyzing high risk areas and engaging with stakeholders.
  • Adopt best practices in securing a supply chain.
  • Noticeably reduce or eliminate the biggest risks to an organization's supply chain.
Read more...

Cybersecurity Advanced

 21 Hours
This instructor-led, live training (online or onsite) is aimed at advanced users who wish to use improve their knowledge.  
Read more...

Cyber Security Awareness Training

 7 Hours
Cyber Security is the practice of applying technologies, controls, and processes to protect computer systems, servers, networks, devices, programs, and data from malicious cyber attacks. This instructor-led, live training (online or onsite) is aimed at anyone who wish to learn how to protect internet-connected systems from different kinds of cyber threats. By the end of this training, participants will be able to:
  • Understand the concept of Cyber Security.
  • Learn and understand the different Cyber Security threats.
  • Learn processes and best practices to protect internet-connected systems from cyber attacks.
Format of the Course
  • Interactive lecture and discussion.
  • Lots of exercises and practice.
  • Hands-on implementation in a live-lab environment.
Course Customization Options
  • To request a customized training for this course, please contact us to arrange.
Read more...

Cybersecurity Fundamentals - A Practical Course

 14 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at IT professionals who wish to learn and apply the fundamentals of Cybersecurity practices, processes, and tools in their organization. By the end of this training, participants will be able to:
  • Understand the Cybersecurity concepts, definitions, architecture, and principles.
  • Learn how to secure and protect digital assets (networks, systems, applications, and data).
  • Implement security models, frameworks, operational techniques, and incident handling.
  • Evaluate and mitigate the impact of cyber attacks, risks, threats, and vulnerabilities.
  • Gain insights on cybersecurity challenges with emerging technologies.
Read more...

Cyber Security Body of Knowledge (CyBOK)

 35 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at software engineers and IT professionals who wish to gain a deeper knowledge on CyBOK and strengthen theoretical and applied skills in cyber security. By the end of this training, participants will be able to:
  • Understand the fundamental concepts, definitions, and principles of cyber security.
  • Acquire in-depth expertise in cyber security by implementing the CyBOK knowledge areas.
  • Gain extensive and foundational knowledge to operationalize the CyBOK framework.
  • Facilitate community and organization enablement to increase focus on data security and privacy.
  • Expand opportunities to earn specialization and credentials for cyber security professions.
Read more...

Cyber Resilience RESILIA Foundation

 14 Hours
The RESILIA  course starts with the purpose, key terms, the distinction between resilience and security, and the benefits of implementing cyber resilience. It introduces risk management and the key activities needed to address risks and opportunities. Further, it explains the relevance of common management standards and best practice frameworks to achieve cyber resilience. Subsequently, it identifies the cyber resilience processes, the associated control objectives, interactions and activities that should be aligned with corresponding ITSM activities. In the final part of the course, it describes the segregation of duties and dual controls related to cyber resilience roles and responsibilities.    
 
Read more...

The Dark Web

 7 Hours
The course is intended for those requiring intelligence or evidence from the Dark Web. This will usually be those working in government or law enforcement though may also be in the private sector.
Read more...

Digital Investigations - Advanced

 21 Hours
In this course, you will learn the principles and techniques for digital forensics investigation and the spectrum of available computer forensics tools. You will learn about core forensics procedures to ensure court admissibility of evidence, as well as the legal and ethical implications. You will learn how to perform a forensic investigation on both Unix/Linux and Windows systems with different file systems. with many advanced topics like wireless, network, web, DB and Mobile crimes investigation    
 
Read more...

Digital Investigations - Introduction

 14 Hours
Digital Forensics and Investigations is a comprehensive entry level course to teach the basic theoretical concepts of digital forensics as well as the practical side of digital forensics, i.e. how to conduct digital forensic investigations. This course is designed for a wide range of people such as law enforcers, crime investigators, managers in larger organizations, technical personnel in larger organizations, and anyone else interested in a general background of digital forensics.    
 
Read more...

Data Protection Practitioner

 14 Hours
This two days course s designed for those with some data protection responsibilities in an
organization or who, for other reasons, wish to achieve and demonstrate a broad
understanding of the law, including the EU General Data Protection Regulation (GDPR) and
the UK Data Protection Bill and their practical application. It is recognized that those with
overall responsibility for data protection within an organization will need to develop a detailed
understanding of the law"    
Read more...

Ethical Hacker

 35 Hours
This class will immerse the students into an interactive environment where they will be shown how to scan, test, hack and secure their own systems. The lab intensive environment gives each student in-depth knowledge and practical experience with the current essential security systems. Students will begin by understanding how perimeter defenses work and then be lead into scanning and attacking their own networks, no real network is harmed. Students then learn how intruders escalate privileges and what steps can be taken to secure a system. Students will also learn about Intrusion Detection, Policy Creation, Social Engineering, DDoS Attacks, Buffer Overflows and Virus Creation. When a student leaves this intensive 5 day class they will have hands on understanding and experience in Ethical Hacking. The purpose of the Ethical Hacking Training is to:
  • Establish and govern minimum standards for credentialing professional information security specialists in ethical hacking measures.
  • Inform the public that credentialed individuals meet or exceed the minimum standards.
  • Reinforce ethical hacking as a unique and self-regulating profession.
Audience: The Course is ideal for those working in positions such as, but not limited to:
  • Security Engineers
  • Security Consultants
  • Security Managers
  • IT Director/Managers
  • Security Auditors
  • IT Systems Administrators
  • IT Network Administrators
  • Network Architects
  • Developers
Read more...

Executive Cyber Security Awareness

 7 Hours
This course provides leaders and managers with an overview of issues and activities associated with cybersecurity. Leaders will receive information in various topics that will build their knowledge and hone executive decision-making in regard to the cybersecurity threat.    
  By the end of this training, participants will be able to:
  • Understand the Internet, social network Privacy
  • Know PII and why it is important
  • Know how to secure the Online Activates
  • Know how to maintain the Privacy of business users
  • Know more of the Cyber laws that protect the Privacy
Format of the Course
  • Interactive lecture and discussion.
  • Lots of exercises and practice.
  • Hands-on implementation in a live-lab environment.
Course Customization Options
  • To request a customized training for this course, please contact us to arrange.
Read more...

IoT Security Architecture

 14 Hours
In this instructor-led, live training in Sofia, participants will understand Internet of Things (IoT) architectures and learn the different IoT security solutions applicable to their organization. By the end of this training, participants will be able to:
  • Understand IoT architectures.
  • Understand emerging IoT security threats and solutions.
  • Implement technologies for IoT security in their organization.
Read more...

Understanding and Managing the Threat of Malware

 7 Hours
This instructor-led, live training in Sofia (online or onsite) is aimed at computer users who wish to understand malware and take appropriate measures to minimize its threat. By the end of this training, participants will be able to:
  • Understand the concept of malware.
  • Identify the different types of malware.
  • Take necessary steps to mitigate malware (procedural, technological, awareness, etc).
Read more...

MasterClass Certified Ethical Hacker Program

 28 Hours
The Certified Ethical Hacker certification is a sought-after cybersecurity certification around the world. This program incorporates instruction and practice to get students ready to take the CEH certification exam as well as the CEH Practical Exam. Candidates who successfully pass both exams earn the CEH Master credential as well as their CEH certification. Students are given the choice to add either the CPENT or the CHFI course to their package. Training for either the Certified Penetration Testing Professional (CPENT) course or the Computer Hacking Forensic Investigator (CHFI) course will be given to each student via EC-Council’s online, self-paced, streaming video program. CPENT (Pen-test):
Teaches students how to apply the concepts and tools taught in the CEH program to a pen-test methodology in a live cyber range. CHFI (Computer Forensics):
Teaches students a methodological approach to computer forensics including searching and seizing, chain-of-custody, acquisition, preservation, analysis and reporting of digital evidence. Course Description CEH provides an in-depth understanding of ethical hacking phases, various attack vectors, and preventative countermeasures. It will teach you how hackers think and act maliciously so you will be better positioned to set up your security infrastructure and defend against future attacks. An understanding of system weaknesses and vulnerabilities helps organizations strengthen their system security controls to minimize the risk of an incident. CEH was built to incorporate a hands-on environment and systematic process across each ethical hacking domain and methodology, giving you the opportunity to work towards proving the required knowledge and skills needed to achieve the CEH credential. You will be exposed to an entirely different posture toward the responsibilities and measures required to be secure. Who Should Attend
  • Law enforcement personnel
  • System administrators
  • Security officers
  • Defense and military personnel
  • Legal professionals
  • Bankers
  • Security professionals
About the Certified Ethical Hacker Master To earn the CEH Master certification, you must pass the CEH Practical exam. The CEH Practical Exam was designed to give students a chance to prove they can execute the principals taught in the CEH course. The practical exam requires you to demonstrate the application of ethical hacking techniques such as threat vector identification, network scanning, OS detection, vulnerability analysis, system hacking, and more. The CEH Practical does not contain simulations. Rather, you will be challenging a live range which was designed to mimic a corporate network through the use of live virtual machines, networks, and applications. Successfully completing the challenges found in the CEH Practical Exam is the next step after attaining the Certified Ethical Hacker (CEH) certification. Successfully passing both the CEH exam and the CEH Practical will earn you the additional certification of CEH Master. About the Certified Ethical Hacker Practical To prove that you are skilled in ethical hacking, we test your abilities with real-world challenges in a real-world environment, using labs and tools requiring you to complete specific ethical hacking challenges within a time limit, just as you would face in the real world. The EC-Council CEH (Practical) exam is comprised of a complex network that replicates a large organization’s real-life network and consists of various network systems (including DMZ, Firewalls, etc.). You must apply your ethical hacking skills to discover and exploit real-time vulnerabilities while also auditing the systems. About CPENT EC-Council’s Certified Penetration Tester (CPENT) program is all about the pen test and will teach you to perform in an enterprise network environment that must be attacked, exploited, evaded, and defended. If you have only been working in flat networks, CPENT’s live practice range will teach you to take your skills to the next level by teaching you to pen test IoT systems, OT systems, as well as how to write your own exploits, build your own tools, conduct advanced binaries exploitation, double pivot to access hidden networks, and customization of scripts and exploits to get into the innermost segments of the network. About CHFI The Computer Hacking Forensic Investigator (CHFI) course delivers the security discipline of digital forensics from a vendor-neutral perspective. CHFI is a comprehensive course covering major forensic investigation scenarios and enabling students to acquire necessary hands-on experience with various forensic investigation techniques and standard forensic tools necessary to successfully carry out a computer forensic investigation.
Read more...

Advanced PHP and Secure Coding Course

 35 Hours
Advanced PHP and Secure Coding Course
Read more...

Last Updated:

Testimonials (25)

The fact that it was seen that he has vast knowledge about the field, he was open to communication with the students, he even took breaks in which we discussed certain topics in the group. It provided us with resources to continue our individual study. He always took breaks to answer questions.

David - Siemens
Course - Cybersecurity Fundamentals - A Practical Course

Machine Translated

Pushing changes on an ongoing basis, when on the 3rd day I started to get more lost than before and it was harder to spot the error quickly, I was quickly able to check out the latest changes and stay up to date with the material

Paulina
Course - Advanced Java Security

Machine Translated

Being approachable and pushing us into interaction

Daniel - EY GLOBAL SERVICES (POLAND) SP Z O O
Course - CISSP - Certified Information Systems Security Professional

I found new things.

Cristian
Course - OpenStack Security

Hazem has a very recent experience passing the exam and knows the gotchas and the way how ISC structures their questions.

Ivan - EY GLOBAL SERVICES (POLAND) SP Z O O
Course - Certified Information System Security Professional (CISSP) CBK Review

I enjoyed the hands on labs because they were engaging and very knowledge sharing

Sinoxolo - Vodacom
Course - Cyber Security Body of Knowledge (CyBOK)

Pentester skills what demonstrate teacher

Oleksii Adamovych - EY GLOBAL SERVICES (POLAND) SP Z O O
Course - Ethical Hacker

Examples from "life" are provided and I was very interested in the topic of personality types

Tomek - Amer Sports Poland
Course - Governance, Risk Management & Compliance (GRC) Fundamentals

Machine Translated

The oral skills and human side of the trainer (Augustin).

Jeremy Chicon - TE Connectivity
Course - NB-IoT for Developers

I extracted valuable information that I will be able to present in my company as a solution to one of the processes

Paweł - Santander
Course - Public Key Infrastructure

Machine Translated

The way to receive the information from the trainer

Mohamed Romdhani - Shams Power
Course - CISM - Certified Information Security Manager

I enjoyed refreshing my knowledge on the various subjects on cyber security. I was increasingly interested around cyber attacks, how they happen and what we (as an organisation) could potentially do to try and mitigate any risks. I did raise a question around AI in cyber attacks, and the answer was very in depth and interesting with a live example given on the spot.

Siobhan
Course - Executive Cyber Security Awareness

See live real-time implementation of activities using sample application investigation/cracking tools.

Paweł - Ośrodek Przetwarzania Informacji – Państwowy Instytut Badawczy

Machine Translated

Azure web security, it was more what i was expecting, the penetration testing i would never do in my job

Toby
Course - Application Security in the Cloud

I enjoyed the whole training session, very handy for a potential new career option, which i have been considering.

Christopher - The Growth Company
Course - Cyber Security Awareness Training

the balance between lectures and practice, the rhythm, the trainer knowledge and pedagogic skill

Armando Pinto - EID
Course - C/C++ Secure Coding

learning about Basel

Daksha Vallabh - Standard Bank of SA Ltd
Course - Basel III – Certified Basel Professional

Risk optimization is more clear than the other subjects

Munirah Alsahli - GOSI
Course - CGEIT – Certified in the Governance of Enterprise IT

The instructor has a very wide range of knowledge and is committed to what he does. He is able to interest the listener with his course. The scope of the training fully met my expectations.

Karolina Pfajfer - EY GLOBAL SERVICES (POLAND) SP Z O O
Course - MasterClass Certified Ethical Hacker Program

The Burpe suite i need more training in this

Gontse Ntshegi - Vodacom
Course - Android Security

Lot's of information explained very well. Good examples, interesting exercises. Trainer showed us his real world experience.

Gergely Bathó - GE Medical Systems Polska Sp. Z O.O.
Course - Application Security for Developers

- Understanding that ATT&CK creates a map that makes it easy to see, where an organization is protected and where the vulnerable areas are. Then to identify the security gaps that are most significant from a risk perspective. - Learn that each technique comes with a list of mitigations and detections that incident response teams can employ to detect and defend. - Learn about the various sources and communities for deriving Defensive Recommendations.

CHU YAN LEE - PacificLight Power Pte Ltd
Course - MITRE ATT&CK

Very knowledgeable trainer, was able to adjust to audience knowledge, excellent industry experience and ability to relate to audience needs Excellent content preparation , tailored to needs discussed beforehand. Good supplement reading materials prepared by trainer

Oliver Steinig - Bosch
Course - IoT Security Architecture

The trainer was very motivated and knowledgeable. The trainer was not only capable of information transfer, she also brought it with humor to lighten the dry theoretical training subject.

Marco van den Berg - ZiuZ Medical B.V.
Course - HIPAA Compliance for Developers

I genuinely enjoyed the real examples of the trainer.

Joana Gomes
Course - Compliance and the Management of Compliance Risk

Upcoming Courses

Other regions in Bulgaria

Other Countries

These courses are also available in other countries

Consulting

Cyber Security Consulting
Online Cyber Security training in Sofia, Cybersecurity training courses in Sofia, Weekend Cybersecurity courses in Sofia, Evening Cyber Security training in Sofia, Cyber Security instructor-led in Sofia, Cybersecurity classes in Sofia, Cybersecurity one on one training in Sofia, Cyber Security instructor-led in Sofia, Evening Cybersecurity courses in Sofia, Cyber Security trainer in Sofia, Cybersecurity boot camp in Sofia, Cybersecurity private courses in Sofia, Cybersecurity coaching in Sofia, Cyber Security instructor in Sofia, Cyber Security on-site in Sofia, Weekend Cybersecurity training in Sofia, Online Cybersecurity training in Sofia
1