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Restructured from flat .tex/.pdf files into per-paper subdirectories. Added Antje Worring as co-author on all papers. Synced PDFs to pdfs/ for download site.
50 lines
2.1 KiB
TeX
50 lines
2.1 KiB
TeX
\section{Comparative Summary}
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\begin{center}
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\begin{tabular}{lcccc}
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\toprule
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\textbf{Property} & \textbf{BTC} & \textbf{ETH} & \textbf{SOL} &
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\textbf{ADA} \\
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\midrule
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Signature scheme & ECDSA & ECDSA & Ed25519 & Ed25519 \\
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Address hash & SHA-256 + & Keccak-256 & none & Blake2b-224 \\
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& RIPEMD-160 & & (base58 pk) & \\
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TX model & UTXO & Account & Account & Extended UTXO \\
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PK exposure at receive & No & No & \textbf{Yes} & No \\
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PK exposure at spend & Yes & Yes & Yes & Yes \\
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PK recoverable from history & At spend & Always & Always & At spend \\
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Exposure window & Minutes & Permanent & Permanent (from receive) & Seconds \\
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Recommended key reuse & No & Yes (forced) & Yes (forced) & No \\
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\midrule
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\textbf{PQ resistance} & \textbf{Partial} & \textbf{Low} &
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\textbf{Worst} & \textbf{Partial} \\
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\bottomrule
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\end{tabular}
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\end{center}
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\subsection{Key Observations}
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\begin{enumerate}[nosep]
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\item \textbf{UTXO models are inherently more resistant} than account
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models because they naturally support key-per-output patterns.
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The public key can be kept hidden until the moment of spending.
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\item \textbf{Account models force permanent exposure}: Once a key
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is used, it is recoverable forever. Migrating to a new key
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requires moving all assets, which is itself a transaction that
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exposes the old key.
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\item \textbf{Hash function security is not the bottleneck}: SHA-256,
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Keccak-256, and Blake2b-224 are all believed to be
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quantum-resistant (Grover provides only a quadratic
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speedup~\cite{grover1996}, so 256-bit hashes provide $\sim$128
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bits of quantum security). The vulnerability is in the
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\emph{signature scheme}, not the address derivation.
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\item \textbf{The real target is frozen funds}: Addresses with known
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public keys and large balances (exchange cold wallets, long-term
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holders, lost key situations) are the highest-value quantum
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targets. These funds sit on-chain with their public keys
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exposed indefinitely.
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\end{enumerate}
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%% ============================================================
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