Mobile App Development 2021W Lecture 3 - Revision history

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	[https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/lec03-cmd.zip]		[https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/lec03-cmd.zip lec03-cmd.zip]

	===lec03-cmd/main.swift===		===lec03-cmd/main.swift===

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Soma at 00:38, 20 January 2021

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	- the app store controls what is trusted		- the app store controls what is trusted
	</pre>		</pre>

			==Code==

			<syntaxhighlight lang="swift" line>
			import
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Soma at 00:37, 20 January 2021

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	Video from the lecture given on January 18, 2020 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec03-20210118.m4v is now available].		Video from the lecture given on January 18, 2020 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec03-20210118.m4v is now available].

			==Notes==

			<pre>
			Lecture 3
			------------

			Tutorial 1
			command line Swift
			Swift language concepts
			- class vs struct
			- types

			Most programming languages have ways to represent collections of data
			We normally call these objects nowadays, but objects have a few other properties
			abstract data types are what objects are based on

			normally we want to associate code with data
			- variabes and functions to go with it

			an abstract data type is this combination

			objects are abstract data types + inheritance

			roughly in swift, struct's are abstract data types, class's are objects
			- no inheritance with struct's

			but there's one other big difference
			- classes are reference types
			- struct's are value types



			Certificates
			- when you install an application, how do you know who created it?
			- is the code coming from a trusted source?
			- code signing certificates are how we make sure that code is legit
			- could still be malicious, but at least we'll know who to blame

			Every developer should have their own certificate that they use to sign their code

			when you install a program, the operating system checks the signature on the code
			to see if it is valid and associated with a trusted certificate
			- if it isn't, it doesn't allow the code to run (or it puts up big warnings that can
			be overridden)
			- "untrusted publisher" messages

			Underlying certificates is public key cryptography
			- a certificate is just a public key with associated metadata (i.e., someone's name
			email address, etc)

			Basic idea of public key crypto signatures
			- create a sig with private key
			- associated public key can verify signature
			- if it is verified, you know the signed data has not been tampered with
			and it was signed by someone with the private key

			Certificates are the basis of app stores
			- devices will only run code signed by trusted certificates
			- the app store controls what is trusted
			</pre>

Soma: Created page with "==Video== Video from the lecture given on January 18, 2020 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec03-20210118.m4v is now available]."

2021-01-19T03:38:04Z

Created page with "==Video== Video from the lecture given on January 18, 2020 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec03-20210118.m4v is now available]."

New page

==Video==

Video from the lecture given on January 18, 2020 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec03-20210118.m4v is now available].