SystemsSec 2018W Lecture 14 - Revision history

Sophia: /* Notes */

2018-03-01T22:00:06Z

Notes

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 [https://homeostasis.scs.carleton.ca/~soma/systemssec-2018w/lectures/comp4108-2018w-lec14-28Feb2018.m4a Lecture 14 audio.]
-==Notes==
+==Notes Student 1==
 ► Many strategies are wrong: If there is one single bug in any major system we use, everything falls apart
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 The body is not an engineering system: Separation of concern is not there, they are all just cells.

Telidy: /* Notes */

2018-03-01T04:31:12Z

Notes

← Older revision		Revision as of 04:31, 1 March 2018
Line 27:		Line 27:

	*Analogies:		*Analogies:
	:DNA = "Stored code"		::DNA = "Stored code"
	::→ Backbone = "Framework"		:::→ Backbone = "Framework"

	:Proteins = "Running code"		::Proteins = "Running code"

	:T-cells = Has randomized detectors to find bad things. If binded to a regular cell, gets killed		::T-cells = Has randomized detectors to find bad things. If binded to a regular cell, gets killed
	::→ Auto-immune disease		:::→ Auto-immune disease
	::::- T-cell recognizes some behaviour and reacts with it		:::::- T-cell recognizes some behaviour and reacts with it
	::::- To prevent mistakes (ie. autoimmune disease)		:::::- To prevent mistakes (ie. autoimmune disease)
	:::::○ Only battles when there is evidence cells are dying		::::::○ Only battles when there is evidence cells are dying


	VIRUSES		VIRUSES
	:*Chunk of DNA/RNA (in between DNA/RNA and proteins) surrounded by proteins		*Chunk of DNA/RNA (in between DNA/RNA and proteins) surrounded by proteins
	:*When comes in contact with cell, injects DNA into cell		*When comes in contact with cell, injects DNA into cell
	::- Overflow cell (cell running malicious code) until it explode, and continue to other cells		:- Overflow cell (cell running malicious code) until it explode, and continue to other cells
	::-Cells have vulnerabilities		:-Cells have vulnerabilities
	:::□ Viruses targets fact that cells have semi-permeable membranes		::□ Viruses targets fact that cells have semi-permeable membranes
	::- Defence		:- Defence
	:::□ Cells have different membranes		::□ Cells have different membranes


	IMMUNE SYSTEM		IMMUNE SYSTEM
	:*Regular proteins will output certain peptide, immune system checks if its the right one		*Regular proteins will output certain peptide, immune system checks if its the right one
	::- Virus imitates the protein		:- Virus imitates the protein
	:*Red, hot: Immune system discovered dead cells and investigates		*Red, hot: Immune system discovered dead cells and investigates
	:*Incompatible MHC: Organ rejects new organ		*Incompatible MHC: Organ rejects new organ


	DIGESTIVE SYSTEM		DIGESTIVE SYSTEM
	:*When your good bacteria turns bad, fecal transplant		*When your good bacteria turns bad, fecal transplant


	The body is not an engineering system: Separation of concern is not there, they are all just cells.		The body is not an engineering system: Separation of concern is not there, they are all just cells.

Telidy: /* Notes */

2018-03-01T04:28:32Z

Notes

← Older revision		Revision as of 04:28, 1 March 2018
Line 4:		Line 4:

	==Notes==		==Notes==
			► Many strategies are wrong: If there is one single bug in any major system we use, everything falls apart

			► We can do better, but the way we do things now is not sustainable

			→ Existence proof: Biology

			:1. Everything starts with a random process

			:2. How do biology systems protect itself again adversaries?


			ANIMALS
			*Animals face threats (ie. Falls of cliff, gets eaten)

			*Threats from really small things (huge factor in mortality, ie. humans lifespan doubled because of disease control):
			:→ They see the animal as a resource, so why not use it?
			:→ Most important defence: Barrier defence
			::- Skin
			:→ But we can't keep everything out: Basic chemistry
			::- Stomach acid to react with what came into your body
			::- Digestive enzymes (enzyme: biological catalyst) breaks down proteins

			*Analogies:
			:DNA = "Stored code"
			::→ Backbone = "Framework"

			:Proteins = "Running code"

			:T-cells = Has randomized detectors to find bad things. If binded to a regular cell, gets killed
			::→ Auto-immune disease
			::::- T-cell recognizes some behaviour and reacts with it
			::::- To prevent mistakes (ie. autoimmune disease)
			:::::○ Only battles when there is evidence cells are dying


			VIRUSES
			:*Chunk of DNA/RNA (in between DNA/RNA and proteins) surrounded by proteins
			:*When comes in contact with cell, injects DNA into cell
			::- Overflow cell (cell running malicious code) until it explode, and continue to other cells
			::-Cells have vulnerabilities
			:::□ Viruses targets fact that cells have semi-permeable membranes
			::- Defence
			:::□ Cells have different membranes


			IMMUNE SYSTEM
			:*Regular proteins will output certain peptide, immune system checks if its the right one
			::- Virus imitates the protein
			:*Red, hot: Immune system discovered dead cells and investigates
			:*Incompatible MHC: Organ rejects new organ


			DIGESTIVE SYSTEM
			:*When your good bacteria turns bad, fecal transplant


			The body is not an engineering system: Separation of concern is not there, they are all just cells.

Soma: Created page with "==Audio== [https://homeostasis.scs.carleton.ca/~soma/systemssec-2018w/lectures/comp4108-2018w-lec14-28Feb2018.m4a Lecture 14 audio.] ==Notes=="

2018-02-28T19:11:00Z

Created page with "==Audio== [https://homeostasis.scs.carleton.ca/~soma/systemssec-2018w/lectures/comp4108-2018w-lec14-28Feb2018.m4a Lecture 14 audio.] ==Notes=="

New page

==Audio==

[https://homeostasis.scs.carleton.ca/~soma/systemssec-2018w/lectures/comp4108-2018w-lec14-28Feb2018.m4a Lecture 14 audio.]

==Notes==