Editing Symmetric Crypto (section)

== <span style="color: #FFFFFF;">Remembering</span> ==
* '''Symmetric Cryptography''' — A type of encryption where only one secret key is used to encrypt and decrypt information.
* '''Plaintext''' — The original, readable message (e.g., "Hello World").
* '''Ciphertext''' — The scrambled, unreadable message produced by encryption.
* '''Encryption''' — The process of converting plaintext into ciphertext.
* '''Decryption''' — The process of converting ciphertext back into plaintext.
* '''Key''' — A string of characters or numbers used by a cryptographic algorithm to transform data.
* '''AES (Advanced Encryption Standard)''' — The global standard for symmetric encryption (used by governments and banks).
* '''Block Cipher''' — An encryption method that scrambles data in fixed-size "chunks" (e.g., 128-bit blocks).
* '''Stream Cipher''' — An encryption method that scrambles data one bit or byte at a time (e.g., used in fast video streaming).
* '''Key Exchange Problem''' — The major weakness of symmetric cryptography: how do you share the secret key with someone without a spy intercepting it?
* '''Brute Force Attack''' — Trying every possible key until the correct one is found.
* '''Entropy''' — A measure of the randomness or unpredictability of a key.
* '''Initialization Vector (IV)''' — A random number added to the start of encryption to ensure that the same message doesn't result in the same ciphertext twice.
* '''DES (Data Encryption Standard)''' — An older, now insecure symmetric algorithm that was replaced by AES.
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