Crypto: Cardano strengthens its security with the Ouroboros Phalanx update

As blockchain security becomes a central issue for regulators, institutions and users, Cardano unveils a major development: Phalanx. This update to the Ouroboros protocol aims to neutralize “grinding” attacks, a vulnerability highlighted in Proof-of-Stake systems. Through this announcement, the network intends to strengthen its cryptographic foundations and affirm its ability to anticipate the technical challenges that weigh on decentralization.

A bulwark against grinding attacks on Cardano

Cardano, with its 115 million transactions, seeks to protect itself from a threat that is still little publicized, but has potentially serious consequences: grinding attacks.

This type of attack allows an actor holding a significant portion of ADA tokens, typically more than 20%, to manipulate the random selection process of block leaders.

“The network randomly chooses who can produce a block. However, if one has enough ADA control, they can grind different random seeds to maximize their chances of winning slots., precise the development team.

This type of manipulation represents a structural risk for any Proof-of-Stake protocol, as it would allow a malicious actor to distort the consensus balance. To address this, Phalanx introduces a Verifiable Delay Function (VDF), which makes any grinding attempt much more costly in terms of resources. In practice:

• Each manipulation attempt requires a complex calculation, which takes real (and unavoidable) time to resolve;

• Hackers can no longer test millions of combinations instantly, because each test becomes a concrete IT cost;

• The selection of validators thus becomes much more robust and resistant to strategic manipulation;

• This modification is integrated into the heart of the protocol, and therefore cannot be activated by a simple adjustment of parameters: a hard fork is necessary for deployment.

By integrating this mechanism directly into the consensus protocol, Cardano adds a new layer of protection to its infrastructure. The approach does not aim to repair a past incident, but to anticipate a threat that is still little exploited using on-chain data and, with a proactive cryptographic response.

A strengthened protocol for a more efficient blockchain

Phalanx goes beyond securing the random selection of block producers. This update will also improve the overall efficiency of the network. “The update will bring faster transactions and better decentralization”we can read in the ad.

One of the notable changes is the evolution of the generation of a random value, which will now extend over two epochs, or approximately 10 days, making any attempt at one-off manipulation of the protocol even more difficult. This multi-step approach increases the resilience of the network governance mechanism.

Furthermore, the choice of a hard fork deployment highlights the scale of this transformation. Unlike simple parameter adjustments, this modification touches the heart of the protocol, which makes its implementation more complex, but also more structuring.

Adopting VDF as part of a PoS algorithm as advanced as Ouroboros reinforces Cardano's image as a blockchain focused on academic research and formal rigor. The project thus stands out in a landscape where many still rely on speed to the detriment of structural safety.

This update could have significant implications. By consolidating its security architecture, Cardano is sending a strong signal to the markets. The blockchain is ready to accommodate more sensitive uses, particularly in decentralized finance, stablecoins, or even institutional projects. Phalanx also marks an implicit response to the criticism often addressed to PoS, sometimes perceived as vulnerable to collusive behavior or the concentration of power. With this development, Cardano is trying to close a breach… even before it is exploited.