When was the earliest lock in China? Why were locks invented?

When primitive people lived in cave dwellings, they sometimes had to push boulders to block the entrance to their caves for safety, and it was not thieves but wild beasts that they were guarding against. After the advent of private ownership, thieves appeared, and the lock was born.

Locks existed in China as far back as 3,000 years ago. However, the earliest locks had no mechanism and were only made in the shape of ferocious animals such as tigers to try to scare thieves away, and could only be described as symbolic.

Lu Ban is said to be the first person to put a mechanism on a lock. As reflected in excavated artifacts and written records, the ancient locks worked by the elasticity of two plate springs. Until now, this kind of spring is still in use.

In foreign countries, although the ancient Greeks had found an extremely reliable lock, but because the key is larger, to be carried on the shoulder, it is difficult to popularize in the general family. Ancient Indians made another bird-shaped "lost lock", the keyhole hidden in the wings can be shaken. The rise of the modern lock? First by the 18th century British invented the "welding fishing lock". The popper lock, which we currently use extensively, was invented by American Nilus Yale Jr. in 1860.

And the invention of the key is a bit later than the lock? The ancient Egyptians were the first in the world to use keys. Their locks consisted of a wooden bolt inserted into a slot with a wooden peg at the top of the groove. Once the bolt was inserted into the groove, the wooden peg would be inserted into the hole in the bolt. This makes the bolt so strong that a key must be used to open it.

Since the Egyptian locks could only be used on the side with the bolt, which was not conducive to flexibility in opening and closing, the Greeks built on this and developed a lock that could be opened from the other side. The key made by the Greeks was a bent wooden stick, shaped and sized much like a small sickle used by farmers. But there were also keys that were up to 3 feet long and had to be carried on the shoulder to be moved, which was quite heavy.

The Romans, arguably the most sophisticated locksmiths of antiquity, were quite knowledgeable about the standards used to make keys, and already knew how to cut the pegs at the end of the key into a variety of different shapes.

/Print.asp?ThreadID=10790

In 405 BC, the Peloponnesian War between Athens and Sparta was winding down. The Spartan army was gradually gaining the upper hand and preparing to launch a final strike against Athens. At this time, the Persian Empire, which was originally on the side of Sparta, suddenly changed its attitude and stopped its assistance to Sparta, with the intention of making Athens and Sparta lose both of them in the ongoing war, so as to profit from it. Under such circumstances, Sparta urgently needed to find out the specific plan of action of the Persian Empire in order to adopt a new strategic approach. While this was going on, the Spartan army captured an Athenian messenger who was traveling from the Persian Empire back to Athens to deliver a letter. The Spartan soldiers searched the messenger carefully, but after a long search, nothing was found except an ordinary belt covered with a hodgepodge of Greek letters. Where was the information hidden? Lysander, the commander of the Spartan army, focused his attention on the belt; the information must be in the jumble of letters. He repeatedly pondered and studied these heavenly writings, rearranged the letters on the belt in various ways, but could not solve them. In the end, Lysander lost confidence, and while fiddling with the belt, he thought of other ways to get the information. When he inadvertently wrapped the belt in a spiral shape around the scabbard in his hand, a miracle occurred. It turned out that those messy letters on the belt actually formed a text. This was a piece of intelligence sent back by an Athenian spy, which told Athens that the Persian army was preparing a sudden attack on the Spartan army when it launched its final assault. Based on this information, the Spartan army immediately changed its battle plan and first attacked the unsuspecting Persian army in a swift and swift manner and defeated it at one stroke, thus relieving it of its worries. The Spartan army then returned to conquer Athens and finally won the war.

The belt intelligence sent back by the Athenian spies was the world's earliest coded intelligence, and the specific method of application was that the two sides of the communication first agreed on the rules for deciphering the code, and then the communication - the party will be the belt (or sheepskin, and other things) wrapped around the agreed length and thickness of the wooden stick to write on. After receiving the letter, if the receiving party does not wrap the belt around a stick of the same length and thickness, it can only see some letters without rules. Later, this method of coded communication was widely spread in Greece. The modern cipher telegraph is said to have been inspired by it and invented. !

What does a cipher do?

It's very existence is a matter of financial gain. This is exactly the same as any cipher invented in the first place, to keep its benefits from being taken away from others.

In the era of the rise of the Internet, passwords have also reached all corners of the world, and are no longer reserved for communications. It brings convenience and a lot of inconvenience at the same time!

Passwords in our lives?

I personally feel that nowadays passwords can be divided into roughly two categories

Cryptogram

Permission

/question/3025367.html