A symmetriccryptography is a new cryptography. Digital signature is the most important application of asymmetric cryptography.
非对称加密技术是一种新的加密技术,数字签名是其最重要的应用。
2
Part 2 (chapters 4-7) introduces the basic techniques of modern cryptography, including symmetriccryptography (block ciphers, stream ciphers), Hash functions, public-key cryptography technology.
A symmetric algorithm requires that both the sender and receiver of the message use the same secret key; this is often referred to as secret key cryptography.