Session 3: Software security / Memory safety¶

Class¶

Document

What I’ve learnt¶

Basic words(but it’s really important)¶

I’ve learnt really basic words and system for the computer function.

Words	meaning	notes
bit	smallest piece of information that computer can store. electric charge(1) or nothing(0)	0 or 1
byte	It represents $2^8$ = 256 distinct values, from 0 to 255	1 byte = 8 bits
hexadecimal	decimal is unwieldy for the binary system(computer uses) and hexadecimal is easy to recognize the number.

Homework¶

1. Install QEMU¶

This QEMU is already installed in the VM, so I just check it.

This is a protection system using keys, public key and private key. Only people who have the correct key can access the document or messages.

2. Download the Protostar exploit virtual machine¶

I downloaded the Protostar from the site and start the QEMU.

protostar

Research¶

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“Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.”

Useful links¶

Code Example¶

Use the three backticks to separate code.

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

Image¶

The following markdown code:

![Sample Photo](../images/sample-photo.jpg)

Turn into: Sample Photo