Information Processing Fundamentals [Session1]Introduction: Basic operation and file system of the OS

Password

[The purpose of this section]
Understand the importance of a password and acquire the knowledge of what makes a good password

Passwords are Very Important

If you create a password without care
If you write your password down on a piece of paper
If you tell your password to somebody

　　　　　↓↓↓
Somebody may steal or modify your data
Somebody may commit wrongful acts using your name
Somebody may steal or modify the data of others
The whole system may be taken over by somebody

Good Passwords and Bad Passwords

(Bad password)
- Short
- Can easily be guessed by others
  - Your name or a famous person’s name, words found in a dictionary
  - Simple sets of characters

(Good password)
- Long (8 characters or more)
- Including more than 3 types of characters from among upper case characters, lower case characters, numeric characters, and symbols
- Difficult to for others to guess, but easy for the user to remember
  1. Create a short sentence that is easy to remember (such as lyrics of your favorite song)
  2. Change some of the characters in the sentence
  　(Example)
  - 5% rate is for what tax? → 5%Ha?zEI
  - Symbol # means halftone above → k#=1/2oaGeru
  - Subtraction can be addition → hk3=+De4I!
  - Astonishing tips → At!uRa-waZ
  - Where are you from, from Higo, where is Higo → antgt-dks,h5s

(Note) In some systems, a password starting with a symbol cannot be used.

・If you have time, refer to importance of a Password and how to create a good password
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