lecture 1 - Flashcards
What can user level do
- using devices to make files
-you as a user are intentionally acting on data - Saving a ticket, a picture, modifying a document, encrypting a password and saving it in a text file, hiding text by changing the font to white.
what can a file system do
Data has to be saved on something. That something has to be organised in a standard way so different computers can use it (Disks, Thumbdrives, memory cards, SIMS etc.)
Therefore, examination of FS, shows how files are saved, deleted, left over residual data can be recovered.
what happens on application level
- An application is a piece of software.
-Software will often save data, for a purpose, but it may not be entirely obvious to a user.
-Sometimes a user will want to add or convert data using an application.
-Your Internet history is saved by the Browser
-The Photograph you took might have the GPS Locations embedded into it.
-You might want to Encrypt data with something a bit beefier than a Caesar cipher.
what does an operating system do
The OS saves a lot of things in the process of trying to be helpful and convenient for you.
OS is where access control and security (i.e. stopping or limiting the user doing things) lives.
what extensions go with each file
.txt is a text file
.jpg is a jpeg picture file
.pdf is a Portable Document Format (PDF) file
.docx and .xlsx are Word and Excel (newer version) files
.rtf is a Rich Text Format (word-like) document
