Differential Fault Attacks (DFAs) have recently emerged as a significant threat against stream ciphers specifically designed for Hybrid Homomorphic Encryption (HHE). In this work, we propose DFAs on the $\textsf{FRAST}$ cipher, which is a cipher specifically tailored for Torus-based Fully Homomorphic Encryption (TFHE). The round function of $\textsf{FRAST}$ employs random S-boxes to minimize the number of rounds, and can be efficiently evaluated in TFHE. With our specific key recovery strategy, we can mount the DFA with a few faults. Under the assumption of precise fault injection, our DFA can recover the key within one second using just 4 or 6 faults. When discarding the assumption and considering a more practical fault model, we can still achieve key recovery in a few minutes without increasing the number of faults. To the best of our knowledge, this is the first third-party cryptanalysis on $\textsf{FRAST}$. We also explored countermeasures to protect $\textsf{FRAST}$. Our analysis revealed that negacyclic S-boxes, a key component of TFHE-friendly ciphers, are unsuitable for incorporating linear structures to resist DFA. Consequently, we recommend removing the negacyclic restriction in the penultimate round of FRAST and introducing non-zero linear structures into the S-boxes of the last two rounds. We believe that our work will provide valuable insights for the design of TFHE-friendly ciphers.
Questions about growing US chip embargo towards China.
Following #cryptocalypse, the bets for tech growth are on AI and the chips are fundamental to that. Is this primarily an economic embargo concealed as a political one?
Tung Hui Hu phrased it as “cloud erases the last boundaries between targeting bombs and ads” so stopping chips for ai in weapons will encompass most new gen chips?
US/EU like to wage oil wars, will we soon have chip wars? How are they related?
https://on.ft.com/3H6NFok
"Binance has acknowledged a 'clerical error' that means it currently keeps reserves for almost half of its 94 Binance-peg tokens worth over $539 million mixed up with customer funds inside a $16.5 billion exchange wallet." 🏆
https://www.bloomberg.com/news/articles/2023-01-24/binance-bnb-acknowledges-storing-users-crypto-with-reserves-in-error
#Binance #BinanceSmartChain #Stablecoin #Cryptocurrency #ChampionStyle #Cryptocalypse #BNBChain #BNB #BUSD #PAX #USDP #Paxos
Another crypto company bits the dust
Today, BlockFi filed voluntary cases under Chapter 11 of the U.S. Bankruptcy Code.
#cryptocalypse
https://twitter.com/blockfi/status/1597253469374910466?s=46&t=Eh-O7yOXrxtRX4STsbRFgA
Walking around Meet Taipei today, someone pushed me a pamphlet for a blockchain firm with a giant #FTX logo slapped on top of it.
Me: "You guys do know that FTX collapsed last week, right?"
Person: "Yeah, it looks terrible, doesn't it?"
Me: "Maybe tell your bosses to place an urgent order of new pamphlets with a local printer rather than giving these out."
Must be tough running a blockchain/crypto firm these days.
Jacob Campbell
geeknik
Merlin Mann
Seda Gürses
⚯ Michel de Cryptadamus ⚯
Rü
Luis_Fierro 
Chunshek has moved