投稿時間:2023-08-23 17:16:20 RSSフィード2023-08-23 17:00 分まとめ(20件)

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IT	気になる、記になる…	｢Apple 心斎橋｣、2階フロアを改装中	https://taisy0.com/2023/08/23/175701.html	apple	2023-08-23 07:32:36
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] 20代非正規雇用者の「理想の年収」　2位「300～350万円未満」、1位は？	https://www.itmedia.co.jp/business/articles/2308/23/news134.html	itmedia	2023-08-23 16:45:00
IT	ITmedia 総合記事一覧	[ITmedia News] SNSで募集、個人情報を送らせて脅迫→捨て駒に　「闇バイト」勧誘の手口、警察庁が公開	https://www.itmedia.co.jp/news/articles/2308/23/news146.html	itmedianewssns	2023-08-23 16:32:00
IT	ITmedia 総合記事一覧	[ITmedia News] ThreadsのWeb版は「数日以内に」実装へ	https://www.itmedia.co.jp/news/articles/2308/23/news140.html	itmedianewsthreads	2023-08-23 16:17:00
IT	ITmedia 総合記事一覧	[ITmedia PC USER] サンワ、86型までの電子黒板にも対応した大型テレビスタンド	https://www.itmedia.co.jp/pcuser/articles/2308/23/news139.html	itmediapcuser	2023-08-23 16:11:00
TECH	Techable（テッカブル）	茨城県那珂市とAgriee、衛星データを活用したスマート農業の実証実験を開始	https://techable.jp/archives/217778	agriee	2023-08-23 07:00:57
js	JavaScriptタグが付けられた新着投稿 - Qiita	Grid.js　セルデータの編集について	https://qiita.com/watmot/items/4b1e56604430f43c5ba6	gridjs	2023-08-23 16:07:56
Linux	Ubuntuタグが付けられた新着投稿 - Qiita	Apache2のインストール手順	https://qiita.com/pyon_kiti_jp/items/7000b9a04aa2899bf9a8	apache	2023-08-23 16:36:40
技術ブログ	Developers.IO	motoでDynamoDBをモックするときはmock_dynamodbを使用することになったので歴史を振り返ってみた	https://dev.classmethod.jp/articles/moto-mock-dynamodb-history/	dynamodb	2023-08-23 07:17:06
海外TECH	DEV Community	Understanding the Vigenère Cipher	https://dev.to/cognivibes/understanding-the-vigenere-cipher-16g5	Understanding the Vigenère Cipher About Vigenère CipherThe Vigenère cipher is a classic encryption technique that dates back to the th century It was invented by a French diplomat and cryptographer named Blaise de Vigenère hence the name It was known as “le chiffre indéchiffrable which means “the indecipherable cipher and remained unbroken until British polymath Charles Babbage broke it in the th century How it worksThe Vigenère cipher is a polyalphabetic substitution cipher that uses a keyword to encrypt and decrypt messages The key idea behind the Vigenère cipher is to use multiple Caesar ciphers Hacking the Caesar Cipher cogniVibes Learn to encrypt or decrypt a Caesar Cipher or hack it cognivibes github io based on the letters of the keyword Let s say we have a plaintext message PPP consisting of nnn letters P p p … pnP p p ldots p nP p​ p​ … pn​​ We also have a keyword KKK consisting of mmm letters K k k … kmK k k ldots k mK k​ k​ … km​​ where m≤nm leq nm≤n To encrypt the message we repeat the keyword until it matches the length of the plaintext Let K′ k k … km k k … km …K k k ldots k m k k ldots k m ldotsK′ k​ k​ … km​ k​ k​ … km​ … repeated until it matches the length of PPP To encrypt each letter pip ipi​​in the plaintext we find the corresponding letter kjk jkj​​in the keyword K′K K′ where jjj is the index of pip ipi​​modulo mmm Then we shift the letter pip ipi​​by the index of kjk jkj​​in the alphabet Let EEE represent the encrypted message The mathematical representation of the encryption process is given by Ei pi kj mod  E i p i k j mod Ei​ pi​ kj​ modwhere EiE iEi​​is the iii th letter of the encrypted message and j i mod  mj i mod mj i modm To decrypt the message we use a similar process We repeat the keyword until it matches the length of the ciphertext Let K′′ k k … km k k … km …K k k ldots k m k k ldots k m ldotsK′′ k​ k​ … km​ k​ k​ … km​ … repeated until it matches the length of EEE To decrypt each letter EiE iEi​​in the ciphertext we find the corresponding letter kjk jkj​​in the keyword K′K K′ where jjj is the index of EiE iEi​​modulo mmm Then we shift the letter Ei​E i​Ei​​ back by the index of kjk jkj​​in the alphabet Let DDD represent the decrypted message The mathematical representation of the decryption process is given by Di Ei kj mod   D i Ei kj mod Di​ Ei kj mod where DiD iDi​​is the iii th letter of the decrypted message and j i mod   mj i mod mj i mod m Note that in these equations we use modular arithmetic with since there are letters in the English alphabet Additionally we assume a simple mapping where AAA is represented by BBB by and so on ExampleLet s use the word KEY as the keyword and encrypt the plaintext message HELLO using the Vigenère cipher First we repeat the keyword KEY to match the length of the plaintext HELLO Thus the repeated keyword becomes KEYKE The corresponding numerical representation of the plaintext message HELLO is H→E→L→L→O→H rightarrow E rightarrow L rightarrow L rightarrow O rightarrow H→E→L→L→O→Using the mathematical encryption formula Ei pi kj mod   E i p i k j mod Ei​ pi​ kj​ mod  we can calculate the encrypted values as follows E mod   →RE mod   →IE mod   →JE mod   →VE mod   →SE mod rightarrow R E mod rightarrow I E mod rightarrow J E mod rightarrow V E mod rightarrow SE​ mod →RE​ mod →IE​ mod →JE​ mod →VE​ mod →SThus the encrypted message is RIJVS To decrypt the ciphertext RIJVS back to the original plaintext we repeat the keyword KEY to match the length of the ciphertext Thus the repeated keyword becomes KEYKE Using the mathematical decryption formula Di Ei kj mod   D i E i k j mod Di​ Ei​ kj​ mod  we can calculate the decrypted values as follows D mod   →HD mod   →ED mod   →LD mod   →LD mod   →OD mod rightarrow H D mod rightarrow E D mod rightarrow L D mod rightarrow L D mod rightarrow OD​ mod →HD​ mod →ED​ mod →LD​ mod →LD​ mod →OThus the decrypted message is HELLO Vigenère TableEncryption decryption in case of Vigenere Cipher is a tedious task The Vigenère table also known as the Vigenère square or the Tabula Recta is used to simplify the process of encryption and decryption It consists of a grid or matrix that provides a systematic way of encrypting and decrypting messages using the Vigenère cipher The table is formed by aligning multiple Caesar ciphers together each with a different shift value determined by a keyword The rows and columns of the table represent the letters of the alphabet and each cell contains the letter resulting from combining the row and column letters using the Caesar cipher The CodeThe encryption decryption script as well as the hacking script can be downloaded from here cogniVibes vigenere cipher About Vigenère CipherThe Vigenère cipher is a classic encryption technique that dates back to the th century It was invented by a French diplomat and cryptographer named Blaise de Vigenère hence the name It was known as “le chiffre indéchiffrable which means “the indecipherable cipher and remained unbroken until British polymath Charles Babbage broke it in the th century How it worksThe Vigenère cipher is a polyalphabetic substitution cipher that uses a keyword to encrypt and decrypt messages The key idea behind the Vigenère cipher is to use multiple Caesar ciphers based on the letters of the keyword Let s say we have a plaintext message P consisting of n letters P p p ldots p n ​ We also have a keyword K consisting of m letters K k k ldots k m ​ where m leq n To encrypt the message we repeat the keyword until… View on GitHub Here is the source code of encryption decryption py def vigenere cipher text keyword mode result keyword length len keyword keyword keyword upper key index for i char in enumerate text if char isalpha ascii offset ord A if char isupper else ord a keyword shift ord keyword key index keyword length ord A if mode decrypt keyword shift keyword shift Reverse the shift for decryption char chr ord char ascii offset keyword shift ascii offset key index result char return result Get modewhile True print Do you want to e ncrypt or d ecrypt response input gt lower if response startswith e action encrypt break elif response startswith d action decrypt break print Please enter the letter e or d print Enter the message message input gt print Enter the keyword keyword input gt upper Perform encryption decryptionresult vigenere cipher message keyword action Display the resultprint f Result result The vigenere cipher function performs the encryption or decryption operation based on the provided parameters It initializes an empty string called result to store the final result It calculates the length of the keyword and converts it to uppercase Next it iterates through each character in the text input If the character is a letter it determines whether it is uppercase or lowercase and assigns an ASCII offset accordingly It calculates the shift value for the current character based on the corresponding letter in the keyword If the mode is set to decrypt it reverses the shift value Then it applies the shift to the current character by subtracting the ASCII offset adding the keyword shift and taking the modulo to wrap around the alphabet Finally it converts the shifted value back to a character using the ASCII offset and appends it to the result string The key index is incremented to ensure the keyword characters are used cyclically After processing all characters in the text the result string contains the encrypted or decrypted message depending on the mode The code prompts the user to enter the encryption or decryption mode encrypt or decrypt and stores the response in the action variable It keeps asking for input until a valid mode is provided Then it asks the user to enter the message and keyword storing them in the message and keyword variables respectively The vigenere cipher function is called with the provided inputs message keyword and action and the result is stored in the result variable The Program in ActionHere is a sample output that we get upon executing the program Do you want to e ncrypt or d ecrypt gt eEnter the message gt Enemy is approaching Send troops immediately Enter the keyword gt MoonlightResult Qbszj qy hibfcnnpouz Esbq ezuvie wazplohmqzm Do you want to e ncrypt or d ecrypt gt dEnter the message gt Qbszj qy hibfcnnpouz Esbq ezuvie wazplohmqzm Enter the keyword gt MoonlightResult Enemy is approaching Send troops immediately Here the key used is Moonlight ConclusionThere are several ways to hack the Vigenère Cipher such as Kasiski examination Friedman test frequency analysis dictionary attack etc However these are advanced methods and require complex application of combinatorics and statistics Discussing even one of those would require a separate post For now we will focus on encryption and decryption I will surely post a Vigenère hack tutorial in future Note Vigenère Cipher although complex is still too easy to break using modern methods and should not be used for serious encryption purposes	2023-08-23 07:00:38
金融	金融資本市場分析 | 大和総研グループ	東証フォローアップ会議の今後の注目点	https://www.dir.co.jp/report/research/capital-mkt/securities/20230823_023956.html	フォローアップ会議で議論が予定されているもののうち、注目されるのは、「資本コスト等を意識した対応」のフォローアップである。	2023-08-23 16:45:00
ニュース	Newsweek	韓国、日本の弁護士を名乗る爆破予告相次ぐ、真相は？	https://www.newsweekjapan.jp/stories/world/2023/08/post-102474.php	通報を受けた警察は、在韓日本大使館周辺等の警備を強化し、予告各所を捜索したが爆弾らしき物は見つからなかった。	2023-08-23 16:18:44
マーケティング	MarkeZine	博報堂DYHDとVpon JAPAN、日本と台湾のクロスボーダーマーケティング支援のため共同研究開始	http://markezine.jp/article/detail/43190	vponjapan	2023-08-23 16:15:00
IT	週刊アスキー	キティやクロミたちがキュートなハロウィーン衣装で登場！ サンリオキャラクターパーク ハーモニーランド「Happy Halloween」9月15日から	https://weekly.ascii.jp/elem/000/004/151/4151484/	halloween	2023-08-23 16:40:00
IT	週刊アスキー	『ウマ娘』第6弾の新育成シナリオが8月24日より追加！	https://weekly.ascii.jp/elem/000/004/151/4151517/	reachforthestars	2023-08-23 16:30:00
IT	週刊アスキー	『DQウォーク』情報動画が公開！ストーリー14章および怒涛の復刻祭りが到来	https://weekly.ascii.jp/elem/000/004/151/4151538/	位置情報ゲーム	2023-08-23 16:20:00
IT	週刊アスキー	数量限定！ 新宿ミロードなどで、シャンプーとトリートメントの自販機が登場	https://weekly.ascii.jp/elem/000/004/151/4151473/	aiico	2023-08-23 16:10:00
IT	週刊アスキー	ASUS IoT、産業用途に適したシングルボードコンピューター「Tinker Board 3Nシリーズ」発表	https://weekly.ascii.jp/elem/000/004/151/4151521/	asusiot	2023-08-23 16:30:00
IT	週刊アスキー	あの大物芸人が夢を語ったであろうチューハイが商品化！ 浅草「捕鯨舩」の缶チューハイ	https://weekly.ascii.jp/elem/000/004/151/4151445/	合同酒精	2023-08-23 16:40:00
IT	週刊アスキー	激辛好きへ挑戦状！ ハラペーニョ超えの「セラーノペッパー」を使用、ピザーラ史上最辛のピザ	https://weekly.ascii.jp/elem/000/004/151/4151449/	pizzala	2023-08-23 16:15:00