Common OS concepts

Question 1

Files descriptors

Answer 1

0 - standard input stdin
1 - standard output stdout
2 - standard error stderr

Question 2

Encryption flows

Answer 2

plain text -> encrypt -> cipher text -> decrypt -> plain text

Question 3

what are the two types of encryption

Answer 3

Symmetric & Asymmetric

Question 4

Name 2 types of Symmetric encryption.

Answer 4

AES,Blowfish,DES,RC$

Question 5

Name 2 types of Asymmetric encryption.

Answer 5

RSA, Diffie-hellman, SHA

Question 6

what is Symmetric encryption

Answer 6

Only one password all parties need that passoword

Question 7

what is Asymmetric encryption

Answer 7

use two keys public and private

Question 8

PGP

Answer 8

Pretty good encryption. Uses Both encryptions

Question 9

salt

Answer 9

is used to add to a harsh and not just use the standard hash

Question 10

hash

Answer 10

is meat to protect strings such as hash.

Question 11

MD5

Answer 11

Message digest are typically represented as a sequence of 32 hex digits.

Question 12

Sha1 & sha2

Answer 12

sha1 - 160 bits

sha2 - 256 or 512

Question 13

what is Encoding

Answer 13

transforming data into another format

example base64 or url

Question 14

what is ASLR

Answer 14

Address space layout randomization.

is a technique to increase security from a common memory based attacks such s buffer overflows and star smashing.