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通訊網路原理與應用

通訊網路原理與應用. 第 9 章 從表示層 (presentation layer) 到應用層 (application layer). 表示層 (presentation layer) 解決的問題. 轉譯 (translation) 加密與解密 (encryption/decryption) 驗證 (authentication) 壓縮 (compression). 加密與解密的方法. 傳統的加密解密法 (conventional encryption/decryption) character-level encryption

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通訊網路原理與應用

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  1. 通訊網路原理與應用 第9章 從表示層(presentation layer)到應用層(application layer)

  2. 表示層(presentation layer)解決的問題 • 轉譯(translation) • 加密與解密(encryption/decryption) • 驗證(authentication) • 壓縮(compression)

  3. 加密與解密的方法 • 傳統的加密解密法(conventional encryption/decryption) • character-level encryption • bit-level encryption • 公鑰加密解密法(public key encryption /decryption)

  4. 多字母式的替換(polyalphabetic substitution)

  5. RSA的原理

  6. 簽章驗證的原理

  7. 壓縮(compression) • 無損失的資料壓縮(lossless data compression) • 有損失的資料壓縮(lossy data compression)

  8. ITU-T在應用層的發展 • MHS(mail handling system) • FTAM(file transfer, access and management) • VT(virtual terminal) • DS(directory system) • CMIP(common management information protocol)

  9. MHS的架構

  10. 虛擬終端機的功能

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