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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
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