Message in a bottle penned by ‘happy as Larry’ WW1 soldiers 109yrs ago washes up on Oz beach – & it’s still readable

TWO messages in a bottle written by World War One soldiers more than a century ago have washed up on a beach in Australia. Debra Brown and her daughter Felicity made the remarkable discovery while collecting litter on Wharton Beach. Inside a glass bott…

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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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