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CRYPTOGRAPHY AND SYSTEM SECURITY (System Security (Security Services (Non…
CRYPTOGRAPHY AND SYSTEM SECURITY
Cryptography
definition
Cryptography is a method of protecting
information and communications through the use of codes so that only those for whom the information is intended can read and process it. The pre-fix "crypt" means "hidden" or "vault" and the suffix "graphy" stands for "writing."
A cyptosystem is of either of 2 types
Asymmetric
A system in which different keys are used for encryption and decryption
Symmetric
A system in which keys used for encryption and decryption are same . Some are the various techniques used
Transposition Cipher
keyless(Rail Cipher)
key
Double Columnar
Single Columnar
center to perifer
given key value
odd even
Substitution Cipher
Monoalphabetic cipher
Polyalphabetical Cipher
Shift / Caesar Cipher
Play-fair Cipher
Hill Cipher
System Security
Security Services
Non Repudiation
Access Control
Data Confidentiality
Integrity
Authentication
A weakness in system is known as vulnerability
if not patched , this vulnerability becomes a threat
if this vulnerability(threat) is exploited it becomes an attack
Goals
integrity
availiblity
confidentiality
types of threats
interruption
modification
interception
fabrication
Network Security and Application
Spoofing
IP
DNS
ARP
Source address
Internet Security Protocols
Firewalls
HoneyPot
IPSEC
IDS
SSL
Flooding
UDP
TCP SYN
ICMP
Security Mechanism
specific
access control data integrity
notarization routing control
encipherment digital signature
authentication exchange
traffic padding
pervasive
security recovery
event detection
security audits
security label
trusted functionality