Topics in cryptography

Cryptography is a type of math used to protect information. It keeps secrets so that only the person who is supposed to see the information can access it. It does this by making it difficult for anyone else to read the information by using special codes. Codes are like secret messages that use a key (a type of code) to change the letters around. If someone tries to read the secret message without the correct key, they will not be able to understand it. Cryptography is also used to make sure that no one changes or alters the information after it is sent, so that the person who receives it is sure that the same information was sent by the person who sent it.