Christopher Hadnagy Books

Social Engineering

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No matter how sophisticated your security equipment and procedures may be, their most, easily exploitable aspect is, and has always been, the human infrastructure. The skilled malicious social engi...

Social Engineering

By Christopher Hadnagy

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Unmasking the Social Engineer

By Paul Ekman, Paul F. Kelly, Christopher Hadnagy

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Phishing Dark Waters

By Robin Dreeke, Christopher Hadnagy, Michele Fincher

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Phishing Dark Waters

By Robin Dreeke, Christopher Hadnagy, Michele Fincher

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Unmasking the Social Engineer

By Paul Ekman, Paul F. Kelly, Christopher Hadnagy

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Social Engineering and Nonverbal Behavior Set

By Christopher Hadnagy

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Social Engineering and Nonverbal Behavior Set

By Christopher Hadnagy

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Phishing Dark Waters

By Robin Dreeke, Christopher Hadnagy, Michele Fincher

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Social Engineering

By Christopher Hadnagy

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.