Signal’s Post-Quantum Cryptographic Implementation

Signal has just rolled out its quantum-safe cryptographic implementation.

Ars Technica has a really good article with details:

Ultimately, the architects settled on a creative solution. Rather than bolt KEM onto the existing double ratchet, they allowed it to remain more or less the same as it had been. Then they used the new quantum-safe ratchet to implement a parallel secure messaging system.

Now, when the protocol encrypts a message, it sources encryption keys from both the classic Double Ratchet and the new ratchet. It then mixes the two keys together (using a cryptographic key derivation function) to get a new encryption key that has all of the security of the classical Double Ratchet but now has quantum security, too…

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Israel launches deadly strikes on Gaza amid truce

Israel’s military said Wednesday that the ceasefire was back on in Gaza after it carried out heavy airstrikes overnight across the Palestinian territory that killed 104 people, including 46 children, according to local health officials. 

The strikes…

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Jensen Huang says the US needs “finesse” to maintain its AI lead over China and Nvidia is an “awkward place” as President Trump meets Xi Jinping later this week (Maggie Eastland/Bloomberg)

Maggie Eastland / Bloomberg:
Jensen Huang says the US needs “finesse” to maintain its AI lead over China and Nvidia is an “awkward place” as President Trump meets Xi Jinping later this week  —  Nvidia Corp. Chi…

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