Managing complexity by "abstracting away" information and detail, in order to focus on the relevant concepts.
Digital information generally comprises data that is created by, or prepared for, electronic systems and devices such as computers, screens, calculators, communication devices and so on, and can be stored on those devices or in the Cloud
A number system defines how we represent numbers. It defines which digits we can use, and what value each position (place value) in a number has.
The number base of a number system defines how many digits are in the number system, and the base of the exponent for each place value in a number.
The number system we use in out everyday lives. It has 10 digits, 0-9.
Number system that has 2 digits, 0 and 1. This is how computers represent numbers at the base level.
Bit means "binary digit". A bit is a single digit in a binary number. A bit can either be 0 or 1.
ASCII is the standard protocol for encoding text information as bits. The ASCII table assigns a unique binary number to every text character.
An image can be represented as a grid of values. Each value encodes the color at that position in the image.
Images are made up of pixels, which are essentially a grid of values. Each value, or pixel, encodes the color at that position in the image.
The hexadecimal number system is the Base 16 number system. It is a number system that only uses 16 digits (0 1 2 3 4 5 6 7 8 9 A B C D E F)
Number system that has 16 digits 1 - 9 and A - F.
The RGB encoding scheme allows us to encode colors as numeric data. It defines the amount of Red, Green, and Blue light in a pixel. Each color channel can have a value between 0 and 255.
A procedure that applies a particular function to an image's pixels to change its appearance
The process of encoding information, using fewer bits than the original representation. We can use algorithms to compress the data to use less bits for storage and then decompress it when we want to view it again.
Lossless Compression involves no loss of information. If data have been "losslessly" compressed, the original data can be recovered exactly from the compressed data after a compress/expand cycle.
Throwing away some of the data to save space. We can throw away a lot of data without any noticeable difference from the original.
Scrambling digital information into an unreadable form. Only those with verified authority (password, key, etc) can unscramble it to read it.
An encryption method in which each letter of the message is shifted by a certain amount, called the key
The same key is used to encrypt and decrypt (e.g., Caesar, Vigenere)
One key encrypts, a different key decrypts.
Public key encryption is a type of asymmetric key encryption. There’s one key that encrypts the information and there is a different key that decrypts the information.
A shared secret that allows the recipient to convert ciphertext into plaintext.
The conversion of encrypted data into its original form.
