Exam Notes
This page contains notes that are approved to be used on exams.
File Headers
| File Type | Header (Hex) | Header (ASCII/Unicode) |
|---|---|---|
| png | 89 50 4e 47 | ‰PNG |
| jpg | FF D8 FF E0 | ÿØÿà |
| bmp | 42 4D | BM |
| avi |
52 49 46 46 xx xx xx xx 41 56 49 20 4C 49 53 54 |
RIFF.... AVI LIST |
| wav |
52 49 46 46 xx xx xx xx 57 41 56 45 66 6D 74 20 |
RIFF.... WAVEfmt |
| mpg (video) | 00 00 01 Bx | .... |
| doc, ppt, xls | D0 CF 11 E0 A1 B1 1A E1 | ÐÏ.ࡱá |
| mp3 | FF Fx | ÿ. |
| 25 50 44 46 | ||
| docx, pptx, xlsx, zip | 50 4B 03 04 | PK.. |
Scaling and Prefixes
| Prefix | Symbol | Base 10 | Number of Bytes (Decimal) |
|---|---|---|---|
| kilo | K | 103 | 1,000 |
| mega | M | 106 | 1,000,000 |
| giga | G | 109 | 1,000,000,000 |
| tera | T | 1012 | 1,000,000,000,000 |
| peta | P | 1015 | 1,000,000,000,000,000 |
| exa | E | 1018 | 1,000,000,000,000,000,000 |
| zetta | Z | 1021 | 1,000,000,000,000,000,000,000 |
| Prefix | Symbol | Base 2 | Number of Bytes (Decimal) |
|---|---|---|---|
| kibi | Ki | 210 | 1,024 |
| mebi | Mi | 220 | 1,048,576 |
| gibi | Gi | 230 | 1,073,741,824 |
| tebi | Ti | 240 | 1,099,511,627,776 |
| pebi | Pi | 250 | 1,125,899,906,842,624 |
| exbi | Ei | 260 | 1,152,921,504,606,846,976 |
| zebi | Zi | 270 | 1,180,591,620,717,411,303,424 |
ASCII Table
Vigenere Cipher
