File:NLC416-13jh008770-62849 密碼學概論.pdf

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search
Go to page
next page →
next page →
next page →

Original file ‎(795 × 1,435 pixels, file size: 614 KB, MIME type: application/pdf, 16 pages)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

密碼學概論   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Author
徐鴻濤講
image of artwork listed in title parameter on this page
Title
密碼學概論
Publisher
[中央訓練團黨政訓練班]
Description

目錄
（一） 密碼重要性
1 第一次世界大戰時之「坦能堡」戰役與「齊茂門」事件
2 此次戰爭各頭密碼鬥爭概況及我國現時密碼泄漏之一般情形
（二） 密碼內容概釋
1 以數字或字純益工表單字或成語兩用作秘密通信之符號者謂之密碼
2 密碼計可分為二大系統
甲 密語系包括「密本」「密語表」
乙 密碼系包括「移位」「代碼」及「加減碼」各種密表及機器密碼均屬之
3 密碼之機秘條件無「常性」及「循環」
（三） 現代各國密碼趨勢
1 由簡單「移位」進加繁複「移位」由「字母代字母」進而「數字代字母」
2 由用本進而第二重變化及機器碼或第三重變化
（四） 我國密碼現狀
1 我國們密碼脫胎於明碼本明碼本之缺點
2 黨政軍高級機關編纂密本頗多進步懼距全體使用二重密碼之途尚遠
3 各部分自編密本而未送審者甚多其泄漏可能性最大
4 根據電台無線電底審查研究不合標準者達百分之四十以上
（五） 如何鞏固我國密碼陣營
1 編纂及使用密本密碼須以「機密」「速迅」「確實」三原則為標準
2 密本表之保管與寄遞須特別嚴密謹慎
3 電稿避免公文常套通報公布或轉電須顧及是否影響密本
4 不可任用毫無訓練之人員充任譯電員因則泄漏國家機密
（六） 結論

Language Chinese
Publication date 民國三十三年[1944]
Source
institution QS:P195,Q732353
(民國時期文獻 民國圖書)
館藏信息
InfoField
MG/TN918/1
主題
InfoField
保密通信
中圖分類
InfoField
TN918
載體形態
InfoField
12頁

Licensing[edit]

This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
Public domain
This image is now in the public domain in China because its term of copyright has expired.

According to copyright laws of the People's Republic of China (with legal jurisdiction in the mainland only, excluding Hong Kong and Macao), amended November 11, 2020, Works of legal persons or organizations without legal personality, or service works, or audiovisual works, enter the public domain 50 years after they were first published, or if unpublished 50 years from creation. For photography works of natural persons whose copyright protection period expires before June 1, 2021 belong to the public domain. All other works of natural persons enter the public domain 50 years after the death of the creator.
According to copyright laws of Republic of China (currently with jurisdiction in Taiwan, Penghu, Kinmen, Matsu, etc.), all photographs and cinematographic works, and all works whose copyright holder is a juristic person, enter the public domain 50 years after they were first published, or if unpublished 50 years from creation, and all other applicable works enter the public domain 50 years after the death of the creator.

Important note: Works of foreign (non-U.S.) origin must be out of copyright or freely licensed in both their home country and the United States in order to be accepted on Commons. Works of Chinese origin that have entered the public domain in the U.S. due to certain circumstances (such as publication in noncompliance with U.S. copyright formalities) may have had their U.S. copyright restored under the Uruguay Round Agreements Act (URAA) if the work was under copyright in its country of origin on the date that the URAA took effect in that country. (For the People's Republic of China, the URAA took effect on January 1, 1996. For the Republic of China (ROC), the URAA took effect on January 1, 2002.[1])
To uploader: Please provide where the image was first published and who created it or held its copyright.

You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.

čeština ∙ Deutsch ∙ English ∙ português ∙ română ∙ slovenščina ∙ Tagalog ∙ Tiếng Việt ∙ македонски ∙ русский ∙ മലയാളം ∙ ไทย ∙ 한국어 ∙ 日本語 ∙ 简体中文‎ ∙ 繁體中文 ∙ +/−


This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.

Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag.
This image contains digital watermarking or credits in the image itself. The usage of visible watermarks is discouraged. If a non-watermarked version of the image is available, please upload it under the same file name and then remove this template. Ensure that removed information is present in the image description page and replace this template with {{Metadata from image}} or {{Attribution metadata from licensed image}}.

Caution: Before removing a watermark from a copyrighted image, please read the WMF's analysis of the legal ramifications of doing so, as well as Commons' proposed policy regarding watermarks.

If the old version is still useful, for example if removing the watermark damages the image significantly, upload the new version under a different title so that both can be used. After uploading the non-watermarked version, replace this template with {{Superseded|new filename|version without watermarks}}.
Bahasa Indonesia ∙ italiano ∙ eesti ∙ sicilianu ∙ Deutsch ∙ català ∙ magyar ∙ čeština ∙ română ∙ español ∙ português ∙ English ∙ hrvatski ∙ Plattdüütsch ∙ français ∙ Nederlands ∙ polski ∙ galego ∙ slovenščina ∙ suomi ∙ svenska ∙ Ελληνικά ∙ беларуская (тарашкевіца)‎ ∙ български ∙ македонски ∙ русский ∙ українська ∙ മലയാളം ∙ ไทย ∙ 日本語 ∙ 中文 ∙ 中文（简体）‎ ∙ 中文（繁體）‎ ∙ עברית ∙ العربية ∙ فارسی ∙ +/−

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current08:01, 11 June 2023Thumbnail for version as of 08:01, 11 June 2023795 × 1,435, 16 pages (614 KB)PencakeBot (talk | contribs)Upload 密碼學概論 (1/1) by 徐鴻濤講 (batch task; nlc:data_416,13jh008770,62849; 民國圖書.8; 密碼學概論)

You cannot overwrite this file.

The following page uses this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:NLC416-13jh008770-62849_密碼學概論.pdf&oldid=775336830"