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When sailing on the sea, fresh water is the most important material. However, it is actually very difficult to preserve. The water will not taste fresh after a few days. Drinking it after it becomes smelly may cause illness.

In addition, not eating fresh vegetables for a long time will also cause other problems. Early sailors would prepare a lot of wine in oak barrels, which was not only a pleasure, but also a substitute for fresh water.

This discovery was not known to the world until the 15th century. Before that, sailing was very dangerous. Even if the crew did not die from pirates and unpredictable weather, they would die from septicemia. Becoming a sailor was a forced choice.

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Arriving at the port not only means getting supplies, but also means being safe. The key is getting the nourishment of "love".

Those sailors who came ashore usually "hunted for beauty" in taverns. As for the senior officials, whether they were wealthy businessmen or navy, they would be invited to dances.

Port cities are often like this. There are both opera houses where nobles can socialize, and pubs where "lower people" can socialize. However, no matter how separated their worlds are, there will always be some overlapping places, such as the Café de Flore, and

Places like the post office.

Italy's cuttlefish pasta is very famous, and Pomona had wanted to eat that dark dish for a long time, but Monica and Alessandro didn't let her order it in Fabio's restaurant.

The Antica Trattoria Poste Vecie restaurant is a converted post office in Venice. Locals don’t come to this place very often, it’s mainly visited by tourists.

Everyone knows that things in tourist attractions are bound to be a bit more expensive. Fortunately, this restaurant is more down-to-earth and the seafood is very fresh. But Pomona doesn’t come here just for the food. This restaurant has a history of 500 years.

, it has been like this since the Middle Ages, and the surrounding inns have been there for hundreds of years. It reminds Pomona of the Leaky Cauldron.

A good private tour guide should understand the preferences of the guests. Some people like shopping, some people like Renaissance tours, and some people like romance. Monica herself has never encountered Pomona’s adventure mode. She finds it novel and fun, but it’s fun.

In Guiwan, money also needs to be earned. How can Pomona’s money be so easy to earn? She taught Monica and Alessandro how to play a game and how to encrypt a message.

The first well-known cipher was the Caesar cipher, which was used by Julius Caesar around 58 BC. In his military orders, Caesar shifted every letter to prevent his enemies from intercepting Caesar's cipher.

After the military order, he directly obtained his real information.

Caesar encryption is the simplest encryption method. Both parties to the encryption must first reach a consensus on the displacement number of the letters. For example, if the encryption displacement number agreed upon by both parties is 3, then each letter sent must undergo 3 displacements, and A becomes

becomes D, B becomes E, and C becomes, assuming the plaintext is "attack", after Caesar encryption with a displacement of 3, it will become "dwwtfn". Then the encrypted text is sent to the recipient through the sender

, so that even if the enemy catches the messenger, they will only get a bunch of incomprehensible text. However, the generals who successfully get the ciphertext can get the true message by subtracting 3 from each letter of the ciphertext.

plaintext information, and this process is called decryption.

This encryption method was used by the West for hundreds of years until an Arab deciphered it. If you calculate the frequency of each letter in the text of any English book, you will find an amazing secret, that is, in English

In text, the most frequently used letter is always e. This is determined by the nature of English text. People who write ciphertext do not realize that in cryptography, this is called a fingerprint.

Around the 15th century, someone proposed a poly-table cipher to achieve this purpose. The difference between the poly-table cipher and the Caesar cipher is that it does not use a single number for displacement encryption, but refers to a displacement word. This encryption method is

The first step is to determine the displacement word, assuming it is "world", and then convert the word into a number according to its position in the alphabet. The characters of "world" correspond to "21, 15, 18, 12,

4", then this sequence of numbers is repeated during the information encoding process, and the plaintext information is shifted according to this sequence. Assume that the plaintext is "abcde fghij", and the encrypted ciphertext is "vrvqj bwavo". In this way, the ciphertext is

When the text is sent to a companion, the companion can decrypt the message based on the pre-agreed secret words and subtract the corresponding displacement. If the ciphertext is intercepted and the eavesdropper calculates the frequency of letter use, he will find a flatter

distribution, the "fingerprint" is difficult to detect.

The word used to encrypt is the key. Once you know the key, it will be faster to decipher the ciphertext. But if you don’t know it, it doesn’t mean you can’t decipher it. The premise is that the person must be very smart and calm down and spend time researching. Now Moni

The card and Ellen Sandro are encrypting according to the key given by Pomona.

A woman is like an encrypted book. Those who have the key can read it very quickly, but those who don't know the key can't understand it. If they give up, then they have nothing to do with the secret knowledge.

This restaurant is located diagonally across from the Franghetti Museum. There is a magical alarm clock near the museum. Legend has it that this old alarm clock belonged to a black magic witch who lived nearby and enjoyed using the clock to mark the time when bills were due.

The house where the witch lived when she died had been closed for years and no one wanted to live there.

Many years later, people began to joke about witches and alarm clocks, so the original alarm clock was removed. However, after the removal, some disturbing phenomena began to appear, such as noises, strange sounds, and items that disappeared inexplicably. Therefore, the alarm clock came back.

Arrive at the original place.

Human beings have curiosity and fear about unknown things. When curiosity defeats fear, it is the driving force for human progress. When fear defeats curiosity, they will shrink back. People in middle age often feel that they are afraid of change, because at that time

People no longer have the time and energy to make mistakes as they did when they were young.

The position of Doge of Venice was first established in 726 to replace the previous tribunes. The earliest Doge was a representative of the Byzantine Empire and was also a church and military leader. As Venice gradually developed into an oligarchy, some of the key functions of the Doge

Gradually it was replaced by other officials and the Venetian Assembly, and the Doge became a representative position.

The governor's powers were not specifically limited, and were mostly held by members of several large families. In the early days, several governors allowed their sons to hold public offices, which led to the position tending to be a hereditary monarchy. Later, the Republic stipulated that the governor was not allowed to nominate himself

successor.

After 1172, the right to elect the Doge was handed over to a committee of forty elected by the Grand Council of Venice. New regulations were made for the election in 1268 to minimize the influence of individual families in the election. The Grand Council drew lots to select nine people,

These nine people went through multiple complex drawing and election steps to select the 41 people who actually have the right to vote. Each step requires a minimum support rate of up to three-quarters or at least more than half to pass.

There are also new regulations. For example, other officials must be present when he opens foreign letters. Governors are also not allowed to own land in foreign countries. After the death of a governor, his political performance will be evaluated. If there is dereliction of duty, the parliament will confiscate his real estate.

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This was mainly due to the influence of the papal election and the Crusades. All along, these profit supremacists have not taken God seriously. The Crusades allowed them to see the terrible power of faith. In order to avoid Venice again

Becoming a puppet of the emperor and the church only allowed the drama of opening the letter and continuing to be monitored.

There were post stations in ancient China, and this kind of information transmission was spread to Persia by envoys. It was mainly used to transmit military intelligence. Later, I heard that lychees were transmitted to Concubine Yang Guifei.

The earliest international postal services in Europe during the Middle Ages were established by commercial guilds for their members. The first, and perhaps the first, international postal service was the Metzger Post established by the German Preserved Guild in the 12th century. At that time, the Metzger Post was established.

An additional condition for building a shop is that it must have a horse and be responsible for carrying mail.

The Metzger Post continued to operate until the end of the 16th century, when it was annexed by the Holy Roman Empire Post Office. In 1301, the Florentine Cloth Shop Merchant Guild established a post office to operate postal services from Florence to major French commodity fairs. Members of the guild paid

Give their mail carriers an assessment.

The monastery post office was established in the early 12th century to handle postal services between various monasteries affiliated with the Grand Order of Italy and France and their general offices. The monastery messenger was called the "messenger" because he delivered parchment letters.

Named after it. These letters are composed of a letter. From one monastery to another, more and more pieces of parchment are connected end to end and sewn together. It takes several pieces of paper to carry such a letter for a week.

In a matter of months, the envelope may be huge by the time you reach the end of the journey.

At the beginning of the 13th century, various universities established a postal service, and students were divided into several "national" groups. Each "national" group had messengers to maintain regular communication with the students' respective home countries and hometowns. For example, the predecessor of the University of Paris, the Paris Soleil

The British group of this seminary has sent messengers to London, Oxford, Dublin, Glasgow, Edinburgh, Aberdeen, Bergen, Uppsala, Krakow, Hungary, Bohemia, Moravia,

The princely territories of Pomerania, Silesia and Germany. The university post office differed from other early postal systems in that they allowed the delivery of private letters to the general public. The income from these post offices was used to pay the salaries of teaching staff. University posts in central Europe

The postal service continued into the 18th century.

Of course, military intelligence is accurate, fast and has the best encryption. It is ideal to provide an express post station eight hundred miles away, but maintaining such a huge postal system requires huge expenses.

Later, these inns were also used part-time for official exchanges and reception of envoys. It was no longer realistic to rely solely on state funding. During the Arab Empire, there were also postal problems. Pigeons were not always safe. In order to transmit information safely, reasonably, and covertly, human beings can be said to be twisted.

Use your brain.

Pomona didn't dare to enjoy the food slowly while someone was chasing her, but they did need a place to sit and write.

I no longer plan to go to Pomona, another information distribution center in Venice, Café de Flore. Women may not be confused by love, but they will still be confused by money, just like the senators are no longer obsessed with women, but are still obsessed with power.

The boss will not know what is written in this encrypted letter. He is like a "porter" who knows nothing and is only responsible for delivering the letter.

Poor Harry Potter.

"Are you done?" Pomona urged them both to hand in their papers like a proctor.

"It'll be ready soon!" Monica and Alessandro said anxiously.

Pomona shrugged, called the waiter, and ordered three Antica coconut-flavored ice creams.

Good children should be rewarded. When Gabrielle Truman defeated the Ravenclaw prefects, she gave him a coconut ice cream. What should she do? She just liked the taste and couldn't stop eating it.
Chapter completed!