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Copyright © Blockchain Council www.blockchain-council.org 1
Copyright © Blockchain Council www.blockchain-council.org
Is Quantum computing an existential threat to
Blockchain Technology?
There is a lot of euphoria surrounding Bitcoin and other cryptocurrencies at the
moment, and this has translated to exponential rises in prices over the last year. A
lot of the hype surrounding cryptocurrencies is justified as nearly every industry in
the world can benefit from blockchain technology in one form or another. But
amidst all of the excitement, it is essential to evaluate whether the underlying
technology is resistant to other emerging technologies, namely quantum
computing.
2
Copyright © Blockchain Council www.blockchain-council.org
Since the fundamental of blockchain technology is focused on ensuring security in
a decentralized fashion, let’s take a look at how quantum technology changes the
equation when it comes to security.
3
Copyright © Blockchain Council www.blockchain-council.org
How Blockchains work: Public Key Cryptography
Public key cryptography relies on a pair of public and private keys to ensure
secure, encrypted communication on an unsecured channel. Public key
cryptography ensures that the message received by the receiver is untampered
and also that the actual sender created it. For example, if two users Alice and Bob
want to communicate with each other using public key cryptography, they both
can generate public and private keys.
4
Copyright © Blockchain Council www.blockchain-council.org
As the name suggests, public keys are broadcasted to the entire network while
private keys are kept secure. Now, if Alice wants to send Bob an encrypted
message, she can encrypt the message using Bob’s private key and digitally sign
the message using her private key. This ensures that the message received by
Bob can only be decrypted by him and the digital signature proves that Alice was
the creator of that message.
5
Copyright © Blockchain Council www.blockchain-council.org
The security aspect of this cryptography scheme comes from the fact that given
the public key, it is practically impossible to come up with the corresponding
private key. In other words, there is no way other than guessing and checking
different private keys. With the current computing resources we have, it would
take an extraordinarily long time to find the correct private key.
6
Copyright © Blockchain Council www.blockchain-council.org
. In other words, there is no way other than guessing and checking different private
keys. With the current computing resources we have, it would take an
extraordinarily long time to find the correct private key. Assuming that a classical
computer tested a trillion keys a second, it would take up to 1.09 x 1019 years to
guess the correct answer. To put numbers into perspective that is roughly about
785 million times longer than the age of the universe (approximately 14 billion
years) because public key cryptography relies on prime numbers for key
generation.
7
Copyright © Blockchain Council www.blockchain-council.org
The Quantum Threat
As it exists, the current paradigm for digital security relies heavily on the sanctity
of the assumptions underlying in the previous section. If quantum computers were
to make our current security framework obsolete, it would also be a disaster not
only for public key cryptography but for all other financial and banking systems as
they exist today.
8
Copyright © Blockchain Council www.blockchain-council.org
The quantum computing threat comes from the fact that quantum computing takes
advantage of quantum bits or “qubits” that can exist in any superposition of values
between 0 and 1 and can, therefore, process much more information than just 0 or
1, which is the limit of classical computing systems. As a result, quantum
computers can handle many orders of magnitude more than traditional computers.
9
Copyright © Blockchain Council www.blockchain-council.org
Currently, however, quantum computers can only work on a limited number of
highly specific applications. Companies like Google and IBM are working on their
implementations of quantum computers which are said to be a 100 million times
faster than classical modes of computation.
10
Copyright © Blockchain Council www.blockchain-council.org
How Blockchain will keep up -
If in the future, the threat of quantum computers becomes more pronounced to
public key cryptography, there are many changes that blockchains can implement
to become quantum resistant. Already, projects like the Quantum Resistant
Ledger (QRL) have their implementation of a blockchain that will not be affected
by the exponential increase in computational power of quantum computers.
11
Copyright © Blockchain Council www.blockchain-council.org
QRL ensures quantum resistance by making sure that private keys are generated
in a very complicated way that relies on hash-based cryptography compared to
current public key cryptography. So far as the consensus algorithm of Bitcoin,
Proof of Work is concerned, it could easily be upgraded using a hard fork that has
been used several times in the past. Since quantum computers can make many
hash functions obsolete, the underlying Blockchain of many tokens would have to
change their architecture fundamentally.
12
Copyright © Blockchain Council www.blockchain-council.org
Blockchain Council Certifications
You can check out our certifications, and kick start your career in the Blockchain
space today.
● Certified Blockchain Expert
● Certified Blockchain Expertv2
● Certified Blockchain Developer
● Certified Smart Contract Developer
● Certified Solidity Developer
● Certified Ethereum Developer
13
THANK YOU!
Any questions?
You can mail us at
hello@blockchain-council.org
Copyright © Blockchain Council www.blockchain-council.org 14

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Is Quantum Computing a Threat to Blockchain Security

  • 1. Copyright © Blockchain Council www.blockchain-council.org 1
  • 2. Copyright © Blockchain Council www.blockchain-council.org Is Quantum computing an existential threat to Blockchain Technology? There is a lot of euphoria surrounding Bitcoin and other cryptocurrencies at the moment, and this has translated to exponential rises in prices over the last year. A lot of the hype surrounding cryptocurrencies is justified as nearly every industry in the world can benefit from blockchain technology in one form or another. But amidst all of the excitement, it is essential to evaluate whether the underlying technology is resistant to other emerging technologies, namely quantum computing. 2
  • 3. Copyright © Blockchain Council www.blockchain-council.org Since the fundamental of blockchain technology is focused on ensuring security in a decentralized fashion, let’s take a look at how quantum technology changes the equation when it comes to security. 3
  • 4. Copyright © Blockchain Council www.blockchain-council.org How Blockchains work: Public Key Cryptography Public key cryptography relies on a pair of public and private keys to ensure secure, encrypted communication on an unsecured channel. Public key cryptography ensures that the message received by the receiver is untampered and also that the actual sender created it. For example, if two users Alice and Bob want to communicate with each other using public key cryptography, they both can generate public and private keys. 4
  • 5. Copyright © Blockchain Council www.blockchain-council.org As the name suggests, public keys are broadcasted to the entire network while private keys are kept secure. Now, if Alice wants to send Bob an encrypted message, she can encrypt the message using Bob’s private key and digitally sign the message using her private key. This ensures that the message received by Bob can only be decrypted by him and the digital signature proves that Alice was the creator of that message. 5
  • 6. Copyright © Blockchain Council www.blockchain-council.org The security aspect of this cryptography scheme comes from the fact that given the public key, it is practically impossible to come up with the corresponding private key. In other words, there is no way other than guessing and checking different private keys. With the current computing resources we have, it would take an extraordinarily long time to find the correct private key. 6
  • 7. Copyright © Blockchain Council www.blockchain-council.org . In other words, there is no way other than guessing and checking different private keys. With the current computing resources we have, it would take an extraordinarily long time to find the correct private key. Assuming that a classical computer tested a trillion keys a second, it would take up to 1.09 x 1019 years to guess the correct answer. To put numbers into perspective that is roughly about 785 million times longer than the age of the universe (approximately 14 billion years) because public key cryptography relies on prime numbers for key generation. 7
  • 8. Copyright © Blockchain Council www.blockchain-council.org The Quantum Threat As it exists, the current paradigm for digital security relies heavily on the sanctity of the assumptions underlying in the previous section. If quantum computers were to make our current security framework obsolete, it would also be a disaster not only for public key cryptography but for all other financial and banking systems as they exist today. 8
  • 9. Copyright © Blockchain Council www.blockchain-council.org The quantum computing threat comes from the fact that quantum computing takes advantage of quantum bits or “qubits” that can exist in any superposition of values between 0 and 1 and can, therefore, process much more information than just 0 or 1, which is the limit of classical computing systems. As a result, quantum computers can handle many orders of magnitude more than traditional computers. 9
  • 10. Copyright © Blockchain Council www.blockchain-council.org Currently, however, quantum computers can only work on a limited number of highly specific applications. Companies like Google and IBM are working on their implementations of quantum computers which are said to be a 100 million times faster than classical modes of computation. 10
  • 11. Copyright © Blockchain Council www.blockchain-council.org How Blockchain will keep up - If in the future, the threat of quantum computers becomes more pronounced to public key cryptography, there are many changes that blockchains can implement to become quantum resistant. Already, projects like the Quantum Resistant Ledger (QRL) have their implementation of a blockchain that will not be affected by the exponential increase in computational power of quantum computers. 11
  • 12. Copyright © Blockchain Council www.blockchain-council.org QRL ensures quantum resistance by making sure that private keys are generated in a very complicated way that relies on hash-based cryptography compared to current public key cryptography. So far as the consensus algorithm of Bitcoin, Proof of Work is concerned, it could easily be upgraded using a hard fork that has been used several times in the past. Since quantum computers can make many hash functions obsolete, the underlying Blockchain of many tokens would have to change their architecture fundamentally. 12
  • 13. Copyright © Blockchain Council www.blockchain-council.org Blockchain Council Certifications You can check out our certifications, and kick start your career in the Blockchain space today. ● Certified Blockchain Expert ● Certified Blockchain Expertv2 ● Certified Blockchain Developer ● Certified Smart Contract Developer ● Certified Solidity Developer ● Certified Ethereum Developer 13
  • 14. THANK YOU! Any questions? You can mail us at hello@blockchain-council.org Copyright © Blockchain Council www.blockchain-council.org 14