Determines the set of valid key sizes for the symmetric cryptographic algorithms 確定對(duì)稱加密算法的有效密鑰大小設(shè)置。
The paper discusses the development of web , browser / server mode conception and the content and mechanism of network security based on web , and also describes the basic conception and system of cipher theory , symmetric - based data encryption standard and advanced encryption standard and asymmetric - based rsa . it presents a detailed design of secrecy net of digital government , and advances a des - and - rsa - based security model of information exchange , which makes use of symmetric cryptographic algorithm to encrypt plaintext , and introduces public - key algorithm rsa to encrypt session key to compose digital envelope and to realize digital signature 本文論述了web的發(fā)展及其browser / server模式概念,以及基于web的網(wǎng)絡(luò)安全的內(nèi)容與機(jī)制;闡述了密碼學(xué)的基本概念、分類,對(duì)稱密鑰密碼體制des與aes以及公開密鑰密碼體制rsa ;最后,利用一種基于des和rsa的信息交換安全模型,詳細(xì)地給出了一個(gè)數(shù)字政府的保密網(wǎng)系統(tǒng)設(shè)計(jì)方案。