18/09/2025
The History of Digital Cash and Full Encryption
From the birth of money to the future
⚫ Money was created to eliminate the inconvenience of barter. In addition to precious metals like gold and silver, paper money, and other currencies, humankind has continued to evolve in its quest for more convenient and secure forms of money . This trend led to the idea of "digital cash," which began in the 1980s .
1️⃣. Pre-digital cash concept (1980s)
In the late 1980s, when computers and networks began to become widespread, researchers envisioned "money that could be used like cash over the Internet " At the time, encryption technology was immature and security was weak, but the vision of "electronic money that was independent of banks or governments" was already emerging.
2️⃣. Early attempts at practical application (1990s)
In the 1990s, pioneering digital cash companies such as DigiCash (Netherlands), CyberCash (USA), and Mondex (UK) emerged. However, the encryption technology available at the time did not provide countermeasures against counterfeiting or fraud, and it was difficult to treat digital currency as unique data
like cash . As a result, all of these attempts failed.
3️⃣. The rise of electronic money and online payments (2000s)
In the 2000s, prepaid electronic money such as Suica and Edy , and online payment services like PayPal
became widespread. However, these were merely prepaid payment methods , and in reality, they were linked to bank accounts or credit cards. They were not "true digital cash," but merely specialized for convenience when used online.
4️⃣. The Emergence of Bitcoin and the Cryptocurrency Era (2009-)
Bitcoin was born based on the paper "Bitcoin: A Peer-to-Peer Electronic Cash System" published by Satoshi Nakamoto in 2009.
The title literally translates to "Peer-to-Peer Electronic Cash System," but in reality there are some discrepancies:
▪️ Peer-to-Peer (P2P)
Strictly speaking, transactions are not direct transfers between parties, but rather nodes around the world hold a large number of copies of the same ledger, and these copies are compared . This is not a true distributed database, but a system in which everyone holds a copy of the same ledger.
▪️ Bitcoin does not transfer the coins themselves, but records changes in the balance in a ledger . Therefore, it is a " ledger currency" that does not transfer unique data like cash, and is not cash.
As such, Bitcoin has not at all realized the concept implied by its original title, and a more accurate description would be "a cryptocurrency that holds a large number of copies of the same ledger."
5️⃣. True Digital Cash with Fully Encrypted Data (2005-2006)
Based on the initial theory of perfect encryption proposed by Dr. Claude Shannon in 1949 , "perfect encryption" based on information-theoretic security was finally completed in 2005. In 2006, this technology was applied to create true digital cash , where payments are completed by directly transferring "information data encrypted with perfect encryption" instead of paper money or coins. This protects against counterfeiting and fraudulent use, and makes it possible to safely transfer digital cash itself over the Internet.
6️⃣. The AI and Quantum Computer Era and the Need for Perfect Encryption (Present to Future)
Currently, the amount of information generated by AI is on track to exceed the total amount of information humanity has ever produced. However, at the same time, issues such as information theft and the spread of false information are becoming more serious, and the threat of quantum computers breaking existing encryption is looming.
In this era, perfect encryption is expected to be the last line of defense to guarantee the authenticity of information and fundamentally protect economic activity.
⚫ Summary
Humanity's dream of creating digital cash , which began in the 1980s , was realized after much trial and error with the application of "perfect encryption"
in 2006. In the future, amid the threats posed by AI and quantum computers, perfect encryption will likely provide the foundation for a truly secure digital economy .
👉 More Details: https://cipher-core.co.jp/blog/
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