Cryptography, the science of writing codes and cryptography to ensure information security, is one of the most important factors contributing to the creation of today's cryptocurrencies and blockchain. However, the encryption techniques used today are the result of an extremely long history of development. Since ancient times, people have used cryptography to transmit information securely. Here is the fascinating history of cryptography that has led to the advanced and sophisticated methods used in modern digital encryption.

Originated in ancient times

Early encryption techniques are known to have existed in ancient times, when most early civilizations appear to have used cryptography to some degree. Symbolic substitution, the most basic form of encoding, appears in both ancient Egyptian and Mesopotamian scripts. The first known example of this type of cipher was found in the tomb of an Egyptian nobleman named Khnumhotep II, who lived about 3,900 years ago.

The purpose of replacing the symbol in the inscription on Knhumhotep's tomb is not to hide information, but to add to its linguistic appeal. The first known example of cryptography being used to protect sensitive information was around 3,500 years ago when a scribe from Mesopotamia used cryptography to hide a ceramic glaze recipe, used on clay tablets.

After the ancient period, cryptography was widely used to protect important military information, cryptography is still not used for this purpose to this day. In the Greek city-state of Sparta, messages were encrypted by writing on a strip of parchment wrapped around a cryptographic stick of a specific size, making the message indecipherable until it was received by someone. Get the prize using a similar stick. Likewise, spies in ancient India are known to have used encrypted messages as early as the 2nd century BC.

Perhaps the most advanced cryptography in the ancient world is credited to the Romans. A prominent example is the Roman cipher, known as the Caesar cipher, in which each letter in the message is replaced by a letter one letter away from it in the Latin alphabet. By knowing this mechanism and how far the letters are shifted, the receiver can successfully decode the message.

Developed during the Middle Ages and Renaissance

During the Middle Ages, cryptography became increasingly important, but substitution ciphers, with the Caesar cipher as an example, remained the standard. Cryptanalysis, the science that studies methods for deriving meaning from encrypted information, has begun to catch up with the still relatively primitive science of cryptography. Al-Kindi, a famous Arabic mathematician, developed a technique called frequency analysis around 800 AD, showing that substitution ciphers were easy to crack. For the first time, those working on decoding encrypted messages had access to a systematic method of decoding. This pushes cryptography further to maintain its usefulness.

In 1465, Leone Alberti developed multi-ontology encryption, considered a solution against Al-Kindi's frequency analysis technique. In a polyalphabetic cipher, a message is encrypted using two separate alphabets. One is the alphabet used to write the original message, the other is a completely different alphabet through which the original message will be encoded. Combined with traditional substitution ciphers, multi-instance ciphers enhance the security of encrypted information. Unless the reader knows the alphabet on which the original message is based, frequency analysis techniques will not be effective.

New methods of encoding information were also developed during the Renaissance, including an early method of binary encryption invented by the famous scholar Sir Francis Bacon in 1623.

Advances in recent centuries

Cryptography continued to thrive for centuries. A major breakthrough in cryptography was described, although probably never built, by Thomas Jefferson in the 1790s. His invention was called the 36-circle cipher wheel. on the moving wheel used to obtain complex encoding results. The concept was so advanced that it served as the basis for American military cryptography until the end of World War II.

World War II also saw a great example of similar cryptography, known as the Enigma machine. Like the cipher wheel, this device, used by the Nazis, used spinning wheels to encode a message, making it virtually unreadable without another Enigma machine. After all, early computer technology was used to help crack the Enigma code. The successful decoding of Enigma messages is still considered an important contribution to the Allied victory.

Cryptography in the computer age

With the rise of computers, cryptography has evolved far beyond the analog technology era. 128-bit mathematical encryption, far stronger than any ancient or medieval cipher, is now standard for many sensor devices and computer systems. Starting in 1990, a completely new form of encryption, called quantum cryptography, has been developed by computer scientists in the hope of once again increasing the level of protection of encryption. modernization.

Recently, encryption techniques have also been applied to cryptocurrencies. Cryptocurrencies leverage a number of advanced cryptographic techniques, including hash functions, public key cryptography, and digital signatures. These techniques are used mainly to ensure the security of data stored on blockchains and to authenticate transactions. A special form of encryption, called Elliptic Curve Digital Signature Algorithm (ECDSA), gives Bitcoin and other cryptocurrency systems added security and ensures that money can only be used by the rightful owner.

Cryptography has come a long way in the past 4,000 years, and it's not likely to stop any time soon. As long as there is sensitive data that needs to be protected, cryptography will continue to grow. Although the cryptographic systems used in today's cryptocurrency blockchains are some of the most advanced forms of cryptography, they are also part of a long line of developments throughout human history. type.