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encryption

• �Definition: Altering data so that it can not be read by anyone other than the intended recipient�Definition: Altering data so that it can not be read by anyone other than the intended recipient.
• �Encrypt and decrypt messages using a Caesar Cipher and a Substitution Cipher
• �Use brute force and statistical attacks to crack simple ciphers

key terms

• �Cipher – a method of encrypting text
• �Plaintext – the unencrypted data
• �Ciphertext – the encrypted data
• �Key – some information needed to encrypt/decrypt the data
• �Crack – to read encrypted data without being given the key beforehand
• �Brute Force – crack a cipher by trying every possible key until successful
• �Statistical Attack – crack a cipher by using statistics and estimates of the most likely values
• �Caesar Cipher – a simple cipher, where each letter is shifted a number of places up the alphabet
• �Substitution Cipher – a simple cipher where each letter is replaced by a different letter