CGX#4: Ascii Encoding (Encoding, Training, CGX)
ASCII Encoding
Hello future Hackers,
We have created the next lesson.
This time we talk about ascii encoding.
Again, the challenge is more informative and gives no points.
Happy Challenging!
- gizmore and x
We have created the next lesson.
This time we talk about ascii encoding.
Again, the challenge is more informative and gives no points.
Happy Challenging!
- gizmore and x
Проблема CGX#4
В этом уроке есть интерактивная задача:
72 101 108 108 111 32 71 117 101 115 116 46 32 83 111 108 117 116 105 111 110 58 32 52 66 48 84 88 70 67 107
Проблема генерируется случайным образом и привязана к вашему сеансу.
Удачи!
Команда WeChall
72 101 108 108 111 32 71 117 101 115 116 46 32 83 111 108 117 116 105 111 110 58 32 52 66 48 84 88 70 67 107
Проблема генерируется случайным образом и привязана к вашему сеансу.
Удачи!
Команда WeChall
Computers can only work with numbers.
We need a mapping, for converting numbers to written characters, to display text to humans.
The [ASCII](https://en.wikipedia.org/wiki/ASCII)
[encoding](../README.md)
was one of the first encoding to solve this problem.
## ASCII
- 1 byte per character.
- Original 7 bit + 1 bit [checksum]()
- [ASCII Table](https://www.asciitable.com/)
## Other encodings
- C64 Screencode (A=1, B=2, ...)
- 8bit ASCII / extended ASCII
- Win ISO
- Unicode with UTF 8/16/32
## PHP Implementation
- number to letter (chr())
- letter to number (ord())
- string encodings in PHP