TAILIEUCHUNG - Lecture Information systems security - Chapter 5 (part 1): Cryptography basics

Chapter 5 (part 1) include objectives: Explain general cryptography concepts, explain basic hashing concepts, basic encryption concepts, explain and implement protocols, explain core concepts of public key cryptography. | Cryptography Basics Objectives Explain general cryptography concepts Explain basic hashing concepts. Basic encryption concepts. Explain and implement protocols Explain core concepts of public key cryptography Cryptography Cryptography – science of encrypting information. “scrambles” (xáo trộn) data so only authorized parties can “unscramble” and read data using two methods Can substitute – change one letter with a different letter (thay thế) Can transpose – scramble the order of letters, without actually changing one for another. (chuyển vị) The best cryptosystems both substitute and transpose. Basic Idea Cryptographic Terminology Cryptography - a method of storing and transmitting data in a form only intended for authorized parties to read or process. Cryptanalysis (phân tích mật mã) - science of studying, breaking, and reverse engineering algorithms and keys. Encryption (mã hóa)– the method of transforming data (plaintext) into an unreadable format. Plain text (cleartext): dữ liệu gốc – the format (usually readable) of data before being encrypted Cipher text (dữ liệu đã được mã hóa) – the “Scrambled” format of data after being encrypted Cryptographic Terminology Decryption (giải mã) – the method of turning cipher text back into plain text Encryption algorithm – a set or rules or procedures that dictates how to encrypt and decrypt data. Also called an encryption “cipher” Key – (crypto variable) a values used in the encryption process to encrypt and decrypt Cryptographic Terminology Key space (không gian khóa) – the range of possible values used to construct keys example: if a key can be 4 digits (0-9) key space = 10,000 (0000 – 9999) if it can be 6 digits key space = 1,000,000 (000,000 – 999,999) Key Clustering – Instance when two different keys generate the same cipher text from the same plaintext Work factor – estimated time and resources to break a cryptosystem Các mục tiêu của mã hóa confidentiality/privacy (Tính bí mật) Integrity (Tính toàn vẹn) .

• An ninh - Bảo mật
• Information systems security
• Lecture Information systems security
• Information security
• Cryptography basics
• Cryptographic terminology
• Transposition cipher
• Lecture On safety and security of information systems
• On safety and security of information systems
• Introduction to information systems security
• History of information security
• Bài giảng Bảo mật hệ thống thông tin
• Goals of information security
• Security process
• Security topologies
• Wireless network security
• Wireless security protections
• IEEE 802
• 11 security
• Protecting systems
• Harden operating systems
• Communications based attack
• Conducting security audits
• Privilege audits
• Privilege management
• Controls for information security
• Accounting information systems
• Lecture Accounting information systems
• Hệ thống thông tin kế toán
• Trust services framework
• Potential risks
• Privilege escalation
• Các phần mềm có hại
• Public key infrastructure
• Cryptographic attacks
• Public domain cryptography
• Access control
• Access control models
• Authentication models
• Virtual Private Network
• Authentication credentials
• Risk management
• Attributes of assets
• Determining relative value
• Cryptographic hash funtionns
• Simple hash functions
• Requirements and security
• Accounting information systems
• Lecture Accounting information systems
• Information systems controls
• System reliability
• Management information systems
• Information systems
• Lecture Management information systems
• Computer based information systems
• Managing information resources
• Monitoring activity
• Intrusion detection
• Secure network
• Malicious attacks
• Malicious Attack
• The common types of malicious attacks
• Basic terminology of cryptography
• History of cryptography
• Symmetric cipher
• Symmetric ciphers
• Block cipher principles
• Data encryption standard
• Advanced encryption standard
• Asymmetric ciphers
• Principles of public Key cryptosystems
• Four parts of access control
• Types of access control
• Firewall concept
• Commercial firewalls
• Network Security Fundamentals
• Guide to Network Security Fundamentals
• Security Baselines
• Disable nonessential systems
• Introduction to management information systems
• Business information technology
• Information security management
• Data safeguards are available