ITM 820 Lecture Notes - Lecture 2: Wireless Sensor Network, Digital Signature, Public-Key Cryptography
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22 Jul 2016
School
Department
Course
Professor
Week 2
ITM 820
2 types of encryption
A. Symmetric Encryption
B. A Symmetric
Symmetric
- Use a single key for encryption and decryption (shared key)
oDES (Data encrypt sys) 56 bit encryption
o3 DES 128 bit encryption – 165 bit
oAES (advanced encryption sys)
oReplaces DES, 256 bit encryption
oVery high security
oBlock cipher text
Problems with shared keys:
a) Must find a mechanism for secure key sharing
b) Compatibility issues
2 methods of Symmetric encryption
1. Block of text
2. Bit-stream (stream)
NTFS file encryption is based on AES
Email encryption use PGP encryption
Key = 2
A -> C (+2)
A Symmetric:
-it uses 2 different keys for encryption and decryption
-RSA
-SSL, TLS, Certificate
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