Introduction to Information Security for 14-Year-Olds: [Episode Edition]

The Mystery Behind the Smartphone

Wait, me too!? Information leaking without me even knowing!?

Hey everyone. You never think that a post on social media could lead to something like that, right...?

One day, my friend Yuki posted a photo on social media as usual, taken at a trendy cafe he went to with friends. Along with a sparkling comment like, "Today's cafe hopping is the best!"

The photo showed cute sweets on the table and the cityscape visible through the window. Yuki was happily watching his "likes" increase, but a few days later, something unbelievable happened.

He received a direct message from a stranger.
"You live near XX Cafe, right! Are you by any chance a student at YY Middle School?" He was horrified. The scenery of the shop captured in the photo and the conversation with his friends were about to reveal his neighborhood and school. He never imagined that just one photo could make his location so obvious. Yuki turned pale.

Hey, I bet there are some people out there thinking, "I've experienced that too!" Right? Like your location being revealed by a sign in the background, or your whereabouts being identified from a friend's post...

It's a "common occurrence," isn't it? Yuki, who thought it was fun at first, was genuinely terrified when he actually started getting messages from strangers and strangely detailed comments.

Don't you think information security is a topic from a world far away?
Actually, it's lurking right beside us—or rather, right inside our smartphones.

1. The "Invisible Pitfalls" Lurking Behind Your Smartphone

The smartphones in our pockets are like magic boxes, aren't they? We connect with friends, watch videos, play games... But behind that magic box, there are sometimes "invisible pitfalls" hidden.

One day, Yuki received a DM on social media from his friend Misaki's account. It said, "I suddenly need money, can you lend me some?"

It sounded just like Misaki, and for a moment, Yuki panicked, thinking, "Wait, what happened!?" But when he looked closely, wait... was there a subtle difference in the account name...?

Yuki realized something was off about the message exchange. "Could this be..." He immediately checked with the real Misaki, and as expected, she had no idea what he was talking about. It turned out to be a scam using a fake account impersonating Misaki.

Yuki said he couldn't stop sweating after almost believing it. If you see a friend's icon but the account name looks strange, or the message exchange feels different than usual, please stop and double-check.

There is another episode that made Yuki's blood run cold.
One day, Yuki was looking at strategy information for a game he was obsessed with. An attractive ad that looked like a treasure map, saying "Get Limited Items!" caught his eye.

Tempted by words like "Free," "Limited," and "For a limited time only," he clicked without thinking! He was then taken to a suspicious site that prompted him to enter his personal information. He got scared and closed the browser just before he was about to enter it, but it's terrifying to think about what would have happened if he had entered everything.

If he had clicked, he might have been flooded with spam emails or received bills for things he didn't recognize, forcing him to consult his family. Be careful, as sweet words often hide pitfalls.

2. Things you can do starting today! 3 super basics to protect your future self

　Now that we understand the fear of invisible pitfalls, let's move on to the question, "So, what should I do?"

　I will introduce three "super basics you can start today" that our ally, Mr. Kindaichi, the information security teacher, taught us.

2.1 Passwords are your "personal key"! Let's create the strongest key!

　Until now, Yuki had been using passwords that were easy to guess, like his birthday or the name of his favorite character.
　Mr. Kindaichi said, "Passwords are like the keys to your house or room. If you have a simple key that anyone can open, thieves can come and go as they please, right?".
　I see, that's true!

　The "strongest password" the teacher taught me was like a secret base code.
　You make it long, mix in uppercase and lowercase letters, and add numbers and symbols.
　For example, something like "I<3Sushi!@2025"? (This is just an example, so please don't copy it!)

　And the most important thing is "not to reuse passwords".
　Yuki was convinced by the teacher's words: "If your house, room, and bicycle all had the same key, if one was found out, everything would be in danger, right?".
　Having a different key for each service is the first step to protecting your future self.

2.2 SNS posts are "public diaries"! Once you put them out, you can't take them back!

　This happened when Yuki was about to post an interesting interaction with a friend on social media. Mr. Kindaichi appeared and said this:
　"Hey Yuki, think of that post as a 'public diary' that anyone can see."

　I was startled. After all, you tend to post on social media as if you're just chatting with friends, don't you?

　But the teacher continued, "Sometimes schools are identified from photos of uniforms, or your home is revealed from the background. Once information is put on the internet, even if you delete it, it remains somewhere."

　Just as it's hard to catch a bird once it has flown into the sky, it's hard to completely erase information once it's on the internet.
　Before posting,
　　"Is this information really okay to make public?"
　　"Who might see this?"
　Take a breath. And make sure to check your privacy settings. This is an important rule to protect our "public diaries".

2.3 Suspicious emails and sites: "Let sleeping dogs lie!"

　This happened when Yuki was about to open an email from an unknown address.
　Mr. Kindaichi stopped him like a hero in a period drama, saying, "Wait a minute! That might be a god you shouldn't touch."

　The teacher taught me points for identifying suspicious emails and sites.

　For example, if the sender of the email is someone you don't know, the subject line is overly provocative, or it rushes you by saying "Click here!"...

　If you think even for a second, "Huh?", please consider it a "god you shouldn't touch." Don't click, delete it immediately! This is a charm to protect us from danger.
　No matter how attractive it looks, there might be danger lurking behind it.

3. Information security is a "personal matter"! To protect your future self

　Didn't you think information security was just some difficult topic about computers?
　But as we discussed this time, it is actually closely related to our daily lives. Mr. Kindaichi also said this:

　One day, Yuki saw a post on the internet where a friend was deeply hurt. The blade of heartless words seemed to be gouging deep into his friend's heart.
　The teacher spoke quietly, "Yuki, on the other side of the screen, there is a 'heart' just like yours."}]

Information security isn't just about protecting your own personal information. It's also about protecting yourself and others from the blades of words—that is, cyberbullying and defamation.

When we look at smartphone or PC screens, we sometimes end up feeling like the person on the other side is just an 'object.' But on the other side of that screen, there is a living, breathing human being just like us, who cries and laughs.

Careless sharing of information can hurt someone. Even in the online world, we must not forget to be considerate of others, just as we do in the real world.

Information security is not just knowledge; it is the ultimate 'skill' to protect your future self and the people you care about.
We don't want to have any regrets like, 'If only I had done that back then...' do we?

Start your safe online life today!

How was that? I bet everything I talked about today is something you've thought, 'Oh, me too!' about.

Information security might sound difficult, but it's actually hidden in the common, everyday things we experience.

Smartphones and PCs are the best tools to enrich our lives. They show us new worlds, like a flying carpet or a magic door that can take us anywhere. But behind that convenience, there are also some dangerous pitfalls hidden.

With small steps you can take starting today, you can protect your future self and the people you care about.

Come on, let's start a safe and secure online life today!

Book Introduction

・Information Security Reader, 6th Edition [Print Replica] Kindle Edition
by Information-technology Promotion Agency, Japan (IPA)
by Jikkyo Shuppan (2024/4/26)
Understand the overview of information security with just this one book! Designed to be easy for beginners to understand through a progression of: Examples -> Basics -> For Individuals -> For Organizations -> Technology -> Laws and Systems -> IPA Activities. It can be used as teaching material in educational institutions, as well as for training new employees and managers in companies. The 6th edition adds new content tailored to the current era, such as telework security and zero trust.
(* Book descriptions, etc., are generally based on the descriptions on the linked site (Amazon). Please refer to the link for detailed content.)

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・Super Introduction to Information Security for First-Year Professionals Kindle Edition
by Hacker Kazu (Author), Ashita no Shigoto-ryoku Kenkyujo (Author)
by Technical Review (2025/3/4)
'System down due to a cyberattack! Users in total chaos!'
'Personal information leaked! Names, addresses, even credit card info...'
With news of information leaks and ransomware never-ending, is your daily behavior really safe?
In fact, just by knowing things like the correct way to manage passwords and how to share files safely, you can significantly reduce the risk of becoming a victim.
This book avoids difficult technical jargon as much as possible and uses diagrams and illustrations to explain, so you can understand it even without prior knowledge.
(* Book descriptions, etc., are generally based on the descriptions on the linked site (Amazon). Please refer to the link for detailed content.)

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