JusticeTech System

Authentication Proving that someone or something is really who they claim to be. For example, when your phone communicates with a website, cryptographic mechanisms can help establish that you're communicating with the legitimate server.

2. Integrity Making sure information hasn't been changed. Imagine you send something like "Give John ₦5,000." then Someone changes it to "Give John ₦50,000." That's a serious problem. Cryptographic techniques can help detect that the information was modified. That's integrity.

Cryptography isn't just "making things secret" This is one of the most important things to understand. Cryptography can provide several different security properties. The major ones are: 1. Confidentiality Keeping information secret. Example: You send a private message to your friend. Someone intercepts it, but they can't understand it. That's confidentiality.

I'd teaching without leaving any stone untouched

What's an algorithm? An algorithm is simply a defined procedure for solving a problem. Imagine telling someone to make fried rice, first heat the pan, then add oil, then add vegetables.. That's a procedure. So cryptographic algorithms are procedures for performing cryptographic operations. Examples include: AES RSA ChaCha20 SHA-256 ECC

Hold but what is Algorithm because i made mention of Encryption Algorithm...

What is a cryptographic key? A key is information that controls how cryptography performs an operation. Think about your house. Your house might have a lock, but having the lock isn't enough. You need the correct key right? Cryptography works similarly for example: Message >> Encryption algorithm + Key >> Encrypted message Try and change the key, and you generally get a different result.

Another major terminology we need to know is: Cryptography key Now what is cryptography key?

What is Ciphertext? Ciphertext is the transformed output produced when plaintext is encrypted. The ciphertext is designed to look meaningless to someone who doesn't have the information needed to decrypt it. Also just remember that: Ciphertext = encrypted data.

Now let's go to ciphertext....

For those who don't still know what plaintext and ciphertext is Plaintext is the original information before encryption. Also It is the message or data in its normal, understandable form. For example, suppose you want to send your friend this message below: Meet me at school Before encryption, that's plaintext. It doesn't have to literally be text. Plaintext can refer to any unencrypted data, including: A message A password A document An image A file Computer data Just remember that: Plaintext = the original, readable data.

I hope you are following?

For example: Imagine TimmyFk sending Daniel a locked box with a message. That's similar to encryption. Then Danuel uses the correct key to unlock it. That's similar to decryption.

Decryption Decryption changes the ciphertext back into readable information. Ciphertext >> Plaintext

Encryption vs Decryption These two words are extremely important. Encryption Encryption changes readable information into an unreadable form. Plaintext >> Ciphertext

So let's proceed.....

I won't be able to teach on CRYPTOGRAPHY without talking about encryption and decryption However if you want to get the most simplified teaching on encryption and decryption kindly scroll up i have done justice to them with simplified teaching

In CRYPTOGRAPHY 1. The original information is called plaintext. 2. The scrambled information is called ciphertext. 3. The secret value used by the cryptographic system is called a key. Now study this flow: Plaintext >> Encryption + Key >> Ciphertext While Ciphertext >> Decryption + Key >> Plaintext

What exactly is cryptography? Cryptography is the science of protecting information by transforming it so that only the intended person can understand or use it. The word comes from Greek: Kryptos which means hidden Graphia which means writing So you can think of cryptography as secret writing.

Imagine you have a secret diary. You don't want your classmates to read it, so you invent a special way of writing that makes the words look like complete nonsense. For example: Original: MEET ME AT 5 becomes Encrypted: QHHW PH DW 5 Your friend knows the secret method for changing it back, but someone who finds the message doesn't. That basic idea is cryptography. Get your writing materials and get in to class