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martin haller a blog about corporate it protection and management in the head of the network administrator new posts about me cooperation contact new articles to your email inbox search for cz in the head of the network administrator martin haller a blog about corporate it protection and management posts know how microsoft entra id passkeys fido2 what to configure and why practical recommendations for configuring passkey fido2 in entra id when to enforce attestation how key restrictions work and why the difference between device bound and synced passkeys matters by martinhaller 2026 03 09 0 it security dark web monitoring infostealers reveal everything your logins identity and even your home address by martinhaller 2025 08 06 0 it security talk microsoft entra id defense our recommendations for setting up the entra id tenant conditional access policies what to monitor and with which tools to audit entra id by martinhaller 2024 01 15 0 it security talk microsoft entra id lateral movement persistencetalk after a successful phishing attempt attackers aim to elevate their privileges and maintain access to the compromised entra id environment for as long as possible by martinhaller 2024 01 08 0 it security talk microsoft entra id attack surface technical training on how attackers gain access to office 365 microsoft entra id by martinhaller 2023 11 13 2 it security moving to azure active directory i want to strengthen the security level of our environment and i think that aad can help us with that for the following reasons by martinhaller 2023 11 06 0 know how our insights from security audits in companies a list of frequently recurring basic errors that we encountered during audits by martinhaller 2023 10 30 0 it security why i want to deploy edr to all customers what is edr what does it offer why do i think it is great technology for any company dealing with it security by martinhaller 2023 10 23 0 it security overblown expectations from security technologies four frequent and unrealistic expectations from siem and sandbox i often encounter by martinhaller 2023 10 16 0 it security cutting down trees in our forest last week hackers managed to break in and encrypt one server of our customer by martinhaller 2023 10 09 0 it security the myth of cybersecurity training for employees in other words why employee training is not what most companies need by martinhaller 2023 10 02 0 ransomware attack on it companies kaseya vsa thanks to the cloud and globalization we are connected more than we think the mistake of the kaseya producer seriously damaged the customers and customers of their customers by martinhaller 2021 08 23 0 ransomware insights from interventions during a ransomware attack bitcoin in retreat rising ransom and fading honesty our new experience from the world of ransomware by martinhaller 2021 06 03 0 it security how to start a career in cybersecurity tips for starting a career in cybersecurity distilled experiences of my friends and me courses websites certifications duration by martinhaller 2021 04 15 0 it security how difficult is to detect a data leak data leak after a hacker attack companies usually ensure the public that no personal data has been leaked but how do they know it by martinhaller 2021 03 26 0 it security business e mail compromise leading cyberattacks business e mail compromise cyber attacks type counterfeiting emails identity theft aimed at making money how do the bec attacks work by martinhaller 2020 09 15 0 ransomware what does ransom negotiation look like demonstration of real communication between ransomware victims and hackers ransom negotiation contract prices pro customer approach and non stop support by martinhaller 2020 07 24 0 it security how could hackers attack vltava basin osint research how to use publicly available information and find a security flaw in the network osint method and vltava basin hack case study by martinhaller 2020 06 22 0 ransomware how to recover a network after a ransomware attack how to restore a corporate computer network after a ransomware attack what to start with i m sharing the hard earned experience so that you can restore operations as soon as possible by martinhaller 2020 06 15 0 it security why using vpn to secure rdp will not stop hackers wondering how to increase rdp remote desktop security let me tell you how hackers most often hack rdps and why vpn won t change anything about it by martinhaller 2020 06 08 0 1 2 4 next where you can meet me 2 9 2026 praha cyb3r days 2026 ai agenti v yolo módu nová éra shadow it 10 10 2026 praha hacker fest 2026 mcp model context problém 13 10 2026 praha cyber security 2026 ai ve firmách tři bezpečnostní výzvy které dnes vidíme v praxi categories from practice 4 it security 31 know how 21 personal 2 ransomware 4 unsolvable problems 5 martin haller patron it cz copyright 2026 martin haller