有一個問題. “Caesar cipher” qièqǔ cāicè yuǎn. cāi 怎麼可以猜猜看了呢?4 所以你會找到在信息裡面使用最多的字母, 字母’t’, 還是字母’e’. gēnjù “Caesar cipher” yǒu yīgè wèntí. Rúguǒ yǒurén nǐ de xìnxī, nàme tāmen kěyǐ nǐ zhuǎnyíle duō Rúguǒ tāmen duìle, tāmen jiù zhīdào xìnxī de nèiróngle, yīnwèi tāmen kěyǐ dú dào wénběn. Zěnme kěyǐ cāi cāi kànle ne? Yīnwèi yīngwén yǒu chángcháng shǐyòng de zìmǔ, suǒyǐ nǐ huì zhǎodào zài xìnxī lǐmiàn shǐyòng zuìduō de zìmǔ, ránhòu cāi cāi zhège zìmǔ shì zìmǔ'd', zìmǔ't', háishì zìmǔ'e'. Lìng yīgè xiǎngfǎ: Nǐ zhǐyào zuò yīgè zìmǔ pǐpèi. Dàn rénmen hái kěyǐ chángcháng shǐyòng de zìmǔ cāicè tā. Slide 20: Another attempt: make a random matching of letters. The Spartans wrapped leather containing letters around a long rod. If the width of the rod was correct, it spelled a word, but if the width was incorrect, then it wouldn’t make sense. People can still attack these methods by looking for the most common letters, though. 另外一個例子用不同的方法加密: Suíjī jìn 2“Spartan” jūnduì gān, zhōuwéi pígé. Pígé gān yuè kuāndù pínlǜ. Lìngwài yīgè lìzi yòng bùtóng de fāngfǎ jiāmì: jìnxíng zìmǔ de pǐpèi. “Spartan” de shǐyòng cháng de zài tā bāo shàng shàng yǒu zìmǔ. Rúguǒ nǐ de yǒu zhèngquè de kuāndù, nàme nǐ kěyǐ yuèdú zhège xìnxī. Rúguǒ bùduì, jiù bùnéng yuèdú tā. Dànshì, huàirén háishì kěyǐ jìsuàn zìmǔ Slide 21: Let’s try something different. 我們來試試另外一個. Wǒmen lái shì shì lìngwài yīgè.
“Caesar cipher” 有一個問題. 怎麼可以猜猜看了呢?4 所以你會找到在信息裡面使用最多的字母, 字母’t’, 還是字母’e’. “Caesar cipher” yǒu yīgè wèntí. Rúguǒ yǒurén qièqǔ nǐ de xìnxī, nàme tāmen kěyǐ cāicè nǐ zhuǎnyíle duō yuǎn. Rúguǒ tāmen cāi duìle, tāmen jiù zhīdào xìnxī de nèiróngle, yīnwèi tāmen kěyǐ dú dào wénběn. Zěnme kěyǐ cāi cāi kànle ne? Yīnwèi yīngwén yǒu chángcháng shǐyòng de zìmǔ, suǒyǐ nǐ huì zhǎodào zài xìnxī lǐmiàn shǐyòng zuìduō de zìmǔ, ránhòu cāi cāi zhège zìmǔ shì zìmǔ'd', zìmǔ't', háishì zìmǔ'e'. Lìng yīgè xiǎngfǎ: Nǐ zhǐyào zuò yīgè zìmǔ pǐpèi. Dàn rénmen hái kěyǐ gēnjù chángcháng shǐyòng de zìmǔ cāicè tā. Slide 20: Another attempt: make a random matching of letters. The Spartans wrapped leather containing letters around a long rod. If the width of the rod was correct, it spelled a word, but if the width was incorrect, then it wouldn’t make sense. People can still attack these methods by looking for the most common letters, though. 另外一個例子用不同的方法加密: 2“Spartan” Lìngwài yīgè lìzi yòng bùtóng de fāngfǎ jiāmì: Suíjī jìnxíng zìmǔ de pǐpèi. “Spartan” de jūnduì shǐyòng cháng de gān, zài tā zhōuwéi bāo shàng pígé. Pígé shàng yǒu zìmǔ. Rúguǒ nǐ de gān yǒu zhèngquè de kuāndù, nàme nǐ kěyǐ yuèdú zhège xìnxī. Rúguǒ kuāndù bùduì, jiù bùnéng yuèdú tā. Dànshì, huàirén háishì kěyǐ jìsuàn zìmǔ pínlǜ. Slide 21: Let’s try something different. 我們來試試另外一個. Wǒmen lái shì shì lìngwài yīgè. jìn yuè