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so this video is going to be a very basic introduction to what encryption actually is.

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encryption is not super complicated, but at its core, the goal is really to protect data.

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data or messages or anything like that.

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the goal of encryption is to hide it from those who shouldn't be able to read it and be able to be read by those who should.

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at the most basic level, that is all encryption is meant to do.

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and that is the entire goal of encryption.

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obviously, with technology these days, encryption has come a long way because it helps protect all the information we send every single day.

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the most basic example of encryption would be taking a very simple message, maybe even a message that contains some sensitive data like this one here, and using some sort of encryption to then to then jumble that message up.

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so anyone that doesn't understand how to unjumble it up, can't read it.

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if anyone was to see the message here, it's just a bunch of nonsense.

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the encrypted message doesn't make sense.

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the sender or receiver should understand how to decrypt the message to see the original contents and therefore be able to read the original message.

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at the simplest level, encryption works in one clear way.

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you have your original message.

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this is your plain text, and then you have an encryption method.

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you have some way to actually encrypt the message.

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and then you have your output, which is known as the ciphertext or the encrypted message.

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and these are the three fundamental building blocks of encryption, the plain text, the ciphertext, and the encryption method itself, which can be called different things, a type of cipher.

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so to take a simple example, you have a message like hello, and you want to use some sort of basic cipher, in this case, like a caesar cipher, and it outputs this as the cipher text.

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now a caesar cipher is one of the most fundamental and basic types of ciphers.

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if you have that hello message, essentially what a caesar cipher does is takes a look at the entire alphabet and using the shift code, in this case, a shift of one, it will output an encrypted version of that message by shifting each letter in the alphabet by one.

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so an h in this example would become an i and e would become an f and l would become an m and an o would become a p. and then the output of text would be i f mmp.

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now this is a very basic type of cipher, obviously, because it's very easy to reverse engineer it to understand what happened.

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if you only had the ifmmp portion, you could very easily say, oh, what if i shifted each letter in the alphabet by one?

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well, you would get back your original text, which is hello.

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but this is the most basic cipher you can come up with with a caesar cipher with a shift of one.

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meaning you just shift the letters one place in the alphabet and that is your encryption method.

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so obviously this is the most basic version of encryption you can have, but encryption nowadays is much, much more complicated.

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it usually involves very long keys that can be 200, 500, even 3000, characters long.

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and those keys you go through a special algorithm and that special algorithm contains a bunch of special math that is really hard to reverse engineer.

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and we'll dive into all of that throughout this encryption course.

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but if you're watching this video through the free course here at dark web academy, you probably won't get introduced to too much of that.

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so all you need to know is that encryption keeps things secure.

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hopefully you enjoyed this video.

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if you have any questions, let me know.

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otherwise, we'll see you in the next one.