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First, let’s define ASM. The term was coined by Gartner somewhere in 2020. It is a new tool in the defensive cybersecurity arsenal for organizations. ASM should help organizations have a better view of their internet-exposed assets, as well as help them identify the unknown ones. Many solutions have appeared since then under the ASM category, but they are not all made equal. A good ASM solution must incorporate Attack Surface Discovery (ASD), which is the ability to find unknown assets. We have been active in both ASD & ASM categories for 6 years now, before these terms were even a thing.
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https://www.helpnetsecurity.com/2023/08/29/patrice-auffret-onyphe-asm-solution/