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APCS Principles Unit 4

Terms in this set (15)

T or F: Companies are required by law to give users the option to personalize what data they can collect about them
False
Caesar Cipher
Shifts every letter a fixed amount
Vigenere Cipher
-Shifts letters by applying a series of Caesar cipher
(Uses a key- ABC)
- The longer the key the harder it is to crack
-Cracked easily by frequency analysis
Public Key encryption
-Computationally hard to decipher
-Used on the web- Allows for secure messages to be sent between parties without having to agree on or share a secret key
-Uses an asymmetric encryption scheme- encryption key is made public but decryption key is kept private
How to solve MOD problems
how many times does the number after the mod go into the number before the MOD and the remainder is the answer
*If number after MOD is bigger than the number before mod then the answer is the number before the MOD
2 characteristics of an ideal encryption scheme
a Private key and computationally hard
Big Data
A broad term for data sets so large or complex that traditional data processing applications are inadequate
Moore's Law
A prediction made by Gordon Moore that computing power will double every 2 years
Cipher
a generic term for a technique that perfomrs an encryption
Cracking an encryption
when you attempt to decode a secret message without knowing all the specifics of the cipher. You are trying to crack the encryption
Decryption
A process that reverses encryption. Taking a secret message and reproducing the original plain text
Random Substitution cipher
an encryption technique that maps each letter of the alphbet to randomly chose other letters of the alphabet
Asymmetric encryption
Used in public key encryption
a scheme in which the key to encrypt data is different than the key to decrypt the data
Firewall
software that runs on servers that only allows traffic through according to some set of secruity rules
SSL/TLS
encryption layer of HTTP that uses public key cryptography to establish a secure connection
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