In recent news, a team of researchers from the University of Cambridge and other institutions have discovered a new attack on Bitcoin’s cryptography called the Hertzbleed ECDSA attack. This attack is significant because it can potentially reveal a Bitcoin user’s private key, which would allow an attacker to steal their funds.
So, what exactly is the Hertzbleed ECDSA attack? To understand it, we first need to understand how Bitcoin’s cryptography works. Bitcoin uses a cryptographic algorithm called the Elliptic Curve Digital Signature Algorithm (ECDSA) to secure transactions and protect users’ private keys. ECDSA works by generating a public key and a private key, which are mathematically linked. The public key is used to receive funds, while the private key is used to sign transactions and spend funds.
The Hertzbleed attack works by exploiting a vulnerability in the way that ECDSA generates random numbers. Specifically, the attack targets the “dual_ec_drbg” algorithm, which is a pseudorandom number generator used by some Bitcoin wallets and other cryptographic applications.
The dual_ec_drbg algorithm has been known to have weaknesses since 2013, when it was revealed that the NSA had backdoored the algorithm to allow them to easily crack encrypted communications. However, the Hertzbleed attack is a new and more powerful way to exploit this weakness.
The Hertzbleed attack works by measuring the frequency of the CPU during the ECDSA signing process. By carefully analyzing these frequency measurements, an attacker can potentially derive the private key used to sign the transaction. This is a serious vulnerability, as it allows an attacker to steal funds from a Bitcoin wallet without the owner’s knowledge.
So, what can Bitcoin users do to protect themselves from the Hertzbleed attack? The good news is that not all Bitcoin wallets are vulnerable to this attack. In particular, wallets that use the “secp256k1” curve for ECDSA are not affected, as this curve is not vulnerable to the Hertzbleed attack.
If you’re not sure whether your Bitcoin wallet is vulnerable to the Hertzbleed attack, it’s a good idea to check with the wallet’s developer or support team. They should be able to tell you whether your wallet is affected and what steps you can take to protect yourself.
In summary, the Hertzbleed ECDSA attack is a serious vulnerability in some Bitcoin wallets that can potentially allow an attacker to steal funds. However, not all wallets are affected, and there are steps you can take to protect yourself. By staying informed and taking appropriate precautions, you can help keep your Bitcoin safe and secure.
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