Nt2580 Class Notes

In: Computers and Technology

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Data encryption is the only thing that will secure data transmission.


Confidentiality: Keeps information secret from all but authorized people
Integrity: Can enforce integrity with hashes
Authentication: Provides a way to authenticate entities
Non-repudiation: Prevents a party from denying a previous statement or action

Cryptology in Business
• Increasing concern about the security of data.
• More sophisticated attacks
• Tremendous growth of computer-related fraud and data theft
• Data protection as a business priority
Intrabusiness Security: Privacy, integrity, authorization, and access control.
Interbusienss Security: Message authentication, signature, receipt and conformation, and non-repudiation
Extrabusiness Security: Anonymity, time stamping, revocation, and ownership

Applications and Uses
• Cryptography uses can be found in categories, such as: o Anti-malware o Compliance or auditing o Forensics o Transaction security o Wireless security

Symmetric Key Crypto Standards
Triple DES (Data Encryption Standard): Consists of three passes of DES using multiple keys
IDEA (International Data Encryption Algorithm): Uses a 128-but key and runs faster than DES
Blowfish: Faster than DES or IDEA
AES (Advanced Encryption Standard): Strong and fast. Defacto standard today.
RC2: Designed by Ronald Rivest
RC4: Used in Internet browsers

Symmetric Key Principles
• The same key encrypts and decrypts
• Symmetric Algorithms can be fast and are well suited to encrypting lots of data
• They are often used once and then discarded

Asymmetric Key Principle
Any data encrypted by a Public Key can be decrypted only by the corresponding Private Key.

Asymmetric Key Crypto Standards
Standard Description
Rivest, Shamir, and Adleman
(RSA) encryption algorithm Considered by many as the standard for encryption.…...

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