Big Idea 5.6 Safe Computing

Personal Identifiable Information (PII)

Personal Identifiable Information or PII is a type of information that is specific to you. For example, your age or race would be an example but something like your favorite cat isn’t (Will insists your diet is a PII but it’s not).

There are times when we want to post our PII online. For example, you would want to upload it to your job profile or a site like LinkedIn because you want people to see it. However, be careful where you upload this data. It will be known by everyone since it’s public.

Some things that you should be cautious about to upload (gray area) would be:

  • Birth date
  • Place of birth
  • Address
  • Phone number
  • Maiden names
  • Drivers License Number

There are things, however, that you will most likely have to upload publicly OR can be found with a quick search. For example:

  • Name
  • Date of Birth
  • SSN
  • Bank Account info
  • Email
  • Picture
  • What high school you attended
  • What college you went to
  • Properties you own
  • State/City of residence
  • Previous residence

You could upload this online (some you have to. Ex: home address for Amazon) but be careful where you upload it. You don’t want to post your mother’s maiden name on social media.

Things that you should keep confidential would be:

  • Private credentials for accounts and what-not
  • Two-factor authentication
  • This is common for sensitive things like financial data
  • Social security numbers
  • Tax records
  • Medical information
  • Financial data

Most if not all financial and government documents should be kept private. However, there will be times when you need to share this. For example, if you are applying for a RealID (form of identification), you will need to submit your social security number.

POPCORN HACK 1:

How do you decide what personal information to share online and what to keep confidential?

Beware, Establish practices for your own Safety

Authentication

Authentication measures protect devices and information from unauthorized access.

Strong Passwords

The easier the password is to guess, the easier it is to make a mess. Strong passwords:

  • 10 or more characters
  • Must contain a symbol
  • Must contain a number
  • Must contain lowercase and uppercase letters
  • Avoid dictionary words/things known about you (ex. “Password”, “123456”, your birthday, your name, your pet’s name, etc.) The above are things hackers can look for while guessing your password

    Types of Authentication

  • What the user knows (ex. passwords, answers to security questions, etc.)
  • What you are (ex. biometric data like eye scan, palm print, thumbprint, etc.)
  • What you have (ex. keycards, etc.)

    Multi-factor Authentication

    When one or more of these authentication measures are used, it is considered multi-factor authentication.

Precautions

  • Run Virus scans to help prevent malicious code from getting into and affecting your system.
  • Keeping the operating system and other software up to date can also fix errors that would allow a virus or malware to compromise a system.

POPCORN HACK 2:

How can multi-factor authentication enhance security?

Nefarious Uses of Internet

Virus and Malware

Virus

  • Viruses can allow unauthorized access by modifying the operating system to accept any user without authentication.
  • Virus malicious programs that can copy themselves and gain access to systems that they are not supposed to be in.

    Malware

  • Malware is often intended to damage a computing system or take partial control over its operation.
  • Infiltrates a system by posing as legitimate programs or by attaching itself to legitimate programs, like an email attachment.
  • Malware is often sent in attachments to things in email. Often they request you to click on an attachment and it starts the process of adding a virus to your computer.

    Phishing: Phishing is an attempt to trick a user into providing personal information (PII) by using social manipulation. Phishing emails look like they’re from a trusted source. They may appear to be an email from a bank or credit card company or a store. They could also be from a Nigerian prince or a fish who is phishing.

They try to trick you into clicking a link and may try to scare you or lure you with the promise of something like money. The link could cause unexpected harm. They may install a virus or keylogger on your computer. A keylogger records keystrokes made by the user which can be used to get credentials. They could also turn your computer into a rogue access point or a fake wireless network which can be used to infect other computers.

Factors to Increase Security of System

Encryption is a good way to increase security of a system.

  • Passwords vs. keys: A password is something used to login or unlock an account, while a key is used to encrypt/decrypt the data being used or transferred by that account.
    Demoing cryptography
  • Symmetric Encryption - Basic ciphers or codes
  • Symmetric encryption uses one key to encrypt and decrypt
    • Examples: Caesar Cipher, Morse Code, Rail Fence Cipher, PSK, etc.
  • Asymmetric encryption is much more secure. It uses public keys to encrypt and private keys to decrypt.
    • Examples: RSA, Diffie-Hellman, Public Key Encryption

“Alice and Bob”

Alice wants to send an encrypted message to her friend Bob. With symmetric key encryption, the following process ensues:


Pretty simple, right! You know what else is simple? Trying to share the encryption/decryption key without letting anyone else know. Enter: Asymmetric Encryption

POPCORN HACK 3:

What are the key differences between symmetric and asymmetric encryption?

SSL/TLS

Uses a Certificate Authority(CA) to generate a signed certificate that proves the server’s legitamacy.

Authentication: SSL/TLS certificates ensure the identity of the server and sometimes the client. They contain information about the entity they are issued to, including the domain name and public key.

Encryption: SSL/TLS certificates facilitate encrypted communication between the client and server. They enable the encryption of data transmitted over the internet, preventing eavesdropping and unauthorized access.

Certificate Authorities (CAs): CAs issue SSL/TLS certificates after verifying the identity of the certificate requester. They act as trusted third parties that sign and validate the authenticity of certificates.

Public and Private Keys: SSL/TLS certificates use asymmetric encryption, involving a public key to encrypt data and a private key to decrypt it. The public key is embedded in the certificate while the corresponding private key is securely held by the server.

Handshake Protocol: When a client connects to a server, they engage in a handshake protocol to establish a secure connection. This involves agreeing on encryption algorithms, exchanging keys, and verifying the authenticity of the certificates.

Expiration and Renewal: SSL/TLS certificates have a validity period. They need to be periodically renewed to maintain secure communication. Expired certificates can disrupt services and pose security risks.

HTTPS: SSL/TLS certificates are commonly used in web browsers to enable HTTPS connections. They signal a secure connection, ensuring data integrity, confidentiality, and authenticity between the web server and the user’s browser.

  • Ex: When we used certbot to make our backend server run using HTTPS in the passion project

Firewall and antivirus Firewall and antivirus software is a really good and easy way to protect your computer. Pretty much all computers come with this software and are enabled as a default. Just make sure to not disable it!

Homework

  1. Describe PII you have seen on a project in CompSci Principles.

On every project in CSP, people put their names. This is an example of a PII, one that you could disclose without much trouble in most situations.

  1. Describe good and bad passwords? What is another step that is used to assist in authentication?

Strong passwords are generally longer (10 or more characters) and meet certain complexity requirements. They avoid common dictionary words or personal things that might be easily guessed. Bad passwords are easy to guess or too simple and can be brute forced. Another step that can be used to assist in authentication is possibly through physical things that the user possesses, like a keycard or token.

  1. Try to describe Symmetric and Asymmetric encryption.

Symmetric encryption is, as the name suggests, symmetric. This means that the information sent is encrypted and decrypted using the same key that those on opposite ends both have.

Asymmetric encryption is where one user has a public key that everyone has knowledge of. Another user can encrypt their information with this public key and send it to the first user. However, the information cannot be decrypted using the public key. The private key, which only the first user should have, is used to decode whatever is sent over by the second user.

  1. Provide an example of encryption we used in AWS deployment.

In logging into the AWS console, we used the TLS and SSL protocols. These protocols establish a secure connection between the user’s browser and the server through exchanging encryption keys. The encryption includes SHA and RSA algorithms, and includes symmetric and asymmetric encryption types. This ensures that all the login information exchanged between the user and the server is encrypted.

  1. Create a python script that lets the user input a password that is checked by the program
    BONUS: Use online wordlists to compare the password, preventing dictionary attacks
# Code Here for Q5
'''
Strong passwords:
- 10 or more characters 
- Must contain a symbol
- Must contain a number
- Must contain lowercase and uppercase letters
- Avoid dictionary words/things known about you
'''

p = input("Enter your password: ")
print('Your password is: '+p)

# Check 10+ chars
print("10 or more characters check: ")
if len(p) >= 10: # must be >= 10 characters
    print('PASS')
elif len(p) < 10:
    print('FAIL')

# Check contain symbol
print("Contain symbol check: ")
mybool = False
symbolasciivals = [] # add all the ascii values of symbols into list
for i in range(33,48):
    symbolasciivals.append(i)
for i in range(58,65):
    symbolasciivals.append(i)
for i in range(91,97):
    symbolasciivals.append(i)
for i in range(123,127):
    symbolasciivals.append(i)
for char in p: # check characters one by one
    if ord(char) in symbolasciivals:
        mybool = True
        break # as soon as the first symbol is found, break because we need just 1
if mybool:
    print('PASS')
else:
    print('FAIL')

# Check contain number
print("Contain number check: ")
numbool = False
numascii = [i for i in range(48,58)] # list comprehension to add ascii values of digits
for char in p:
    if ord(char) in numascii:
        numbool = True
        break # again, break as soon as one digit is found
if numbool:
    print('PASS')
else:
    print('FAIL')
    
# Check contain both lowercase and uppercase
print("Contain lowercase and uppercase check: ")
upper = [i for i in range(65,91)] # initialize the upper and lower ascii value lists
lower = [i for i in range(97,123)]
lowerbool = False
upperbool = False
for char in p:
    if ord(char) in lower:
        lowerbool = True
        break
for char in p:
    if ord(char) in upper:
        upperbool = True
        break
if lowerbool and upperbool:
    print('PASS') # both lowerbool and upperbool have to be True for the test to pass
else:
    print('FAIL')

# Check if safe from dictionary attacks
import nltk
from nltk.corpus import words # use the ntlk wordlist from python

common_words_set = set(words.words())

print("Does not use common words found in online wordlist check: ")
# segment the password into chunks, broken up by non-alphabet characters
s = p.lower() # only consider lowercase words
splitpass = []
chunk = ''
for i in range(len(s)):
    if ord(s[i]) not in lower:
        if len(chunk) > 3:
            splitpass.append(chunk) # only care about words over 3 characters
        chunk = ''
    elif i == len(s)-1: # if last character, have to add it to the chunk
        if ord(s[i]) in lower:
            chunk += s[i]
        splitpass.append(chunk)
    else:
        chunk += s[i]
print('Words found in your password: ')
print(splitpass)
wordbool = False
for word in splitpass:
    if word in common_words_set:
        wordbool = True
        break # if one common word is found, it's joever
if not wordbool:
    print('PASS')
elif wordbool:
    print('FAIL')


Your password is: among_sussy_baka_a6969
10 or more characters check: 
PASS
Contain symbol check: 
PASS
Contain number check: 
PASS
Contain lowercase and uppercase check: 
FAIL
Does not use common words found in online wordlist check: 
Words found in your password: 
['among', 'sussy', 'baka']
FAIL