SUI Price Defends 200 EMA as Sui Brings Quantum Security to Devnet

• SUI is defending its 200 EMA near $1.03 inside a descending triangle that reaches its apex this week.
• Sui processed its first native quantum-resistant transaction on Devnet using the NIST-standardized ML-DSA-65 algorithm.
• Users will be able to keep their existing addresses and recovery phrases when switching to post-quantum keys.
• Quantum-resistant accounts are targeted for Mainnet in early 2027, depending on independent audits.

SUI is holding its 200-period exponential moving average (EMA) near $1.03 on the 4-hour chart, a level buyers have defended twice since October 8. The token trades at $1.05 after an 11.66% weekly drop. The test comes on the same day Mysten Labs co-founder and chief cryptographer Kostas Chalkias reported Sui’s first native quantum-resistant transaction on Devnet, the network’s development environment. The transaction was signed with ML-DSA-65, an algorithm the U.S. National Institute of Standards and Technology (NIST) standardized to resist future quantum computers. The feature is not yet on Testnet, Sui’s public test network, or on Mainnet, where real funds move, and ordinary accounts are targeted to gain it in the first quarter of 2027.

The 1st Sui devnet native Quantum-Safe transactionhttps://t.co/Tb1jjq6mZYpic.twitter.com/QR16CMeLUe

— Kostas Kryptos (@kostascrypto) October 13, 2026

Sui’s latest Devnet release adds a new type of wallet signature

The change shipped in devnet-v1.82.0, released on October 12 under protocol version 139. It adds ML-DSA-65 to the list of signature types the network recognizes, next to Ed25519, the system Sui accounts use today. Most quantum-security announcements in crypto are still roadmap material. This one runs on a live network. Sui added it without touching consensus, because its account system was built to accept new signature types without changing balances, contracts or the network’s history.

First ML-DSA-65 signed transaction on Sui Devnet. Source: Sui Explorer

Why Sui keeps a hash-based backup in case lattice math fails

ML-DSA-65 will cover everyday accounts at the protocol level. A second scheme, SLH-DSA-SHA2-128s, will guard high-value holdings through vaults written as Move smart contracts. The first relies on lattice problems, a type of math puzzle that is considered hard even for quantum computers. The second relies only on hash functions, the same one-way formulas that already secure blockchains, so a future break in lattice math would leave vault assets untouched. Sui also plans a combined option where a transaction needs two signatures, one from a current key and one from a quantum-resistant key, so an attacker would have to break both.

EVERYDAY ACCOUNTS

ML-DSA-65

Standard and basisNIST FIPS 204, lattice cryptography

DeploymentNative protocol support

Mainnet targetQ1 2027

HIGH-VALUE VAULTS

SLH-DSA-SHA2-128s

Standard and basisNIST FIPS 205, hash functions

DeploymentMove smart contracts

Mainnet targetEnd of 2026

Address aliasing lets accounts swap keys without moving coins

On most chains, the address is derived from the public key. A new key means a new address, a transfer of funds and updated exchange whitelists for every user. Sui sidesteps that. A feature called address aliasing lets an account switch to a new signing key while keeping the same address and assets. Mysten Labs also says post-quantum keys will be derived from the user’s existing recovery phrase. The switch is optional: an account stays on its Ed25519 key until the owner activates the new one, so the pace of adoption depends largely on wallet developers.

3,309-byte signatures: fast to verify, heavy to carry

Verification took 23.2 microseconds on an Apple M2 Max, which Mysten Labs calls roughly comparable to Ed25519. The cost is size. At 3,309 bytes, an ML-DSA-65 signature is about 50 times larger than a 64-byte Ed25519 signature, and that extra data has to be transmitted and stored. Sui’s 128 KB transaction limit and its programmable transaction blocks, which bundle several operations under one signature, absorb part of the load. The benchmarks, however, come from a single hardware setup.

Vaults in 2026, everyday accounts in 2027

APRIL 2025 · DONE

First research paper on quantum risks to Sui

AUGUST 2026 · DONE

Implementation plan, benchmarks and migration strategy published

OCTOBER 13, 2026 · TODAY

First ML-DSA-65 transaction on Devnet

END OF 2026 · TARGET

Vaults on Mainnet, ML-DSA-65 accounts on Testnet

Q1 2027 · TARGET

Native quantum-resistant accounts on Mainnet 

Google’s 500,000-qubit estimate pulls the threat closer

A large, stable quantum computer could, in theory, work out a wallet’s private key from its public key, which becomes visible on-chain after the first transaction, and then sign transfers in the owner’s name. No such machine exists. A March 2026 estimate from Google Quantum AI, cited in Sui’s research, found that a machine with fewer than 500,000 qubits, the basic units of a quantum computer, might crack such keys in minutes. That is a resource calculation, not a demonstrated attack, and today’s machines are far smaller and less reliable than that. Near developers merged a proposal this summer to add ML-DSA-65 as an optional key type. Ethereum and Bitcoin developers are still weighing hash-based designs and migration proposals. Across the industry, the harder problem now is moving millions of existing accounts onto whichever algorithm a chain picks.

Custodians move first, retail waits for wallets

Exchanges, custodians and treasuries holding SUI in cold storage are the natural first users of vaults, especially where internal security policies follow NIST guidance. U.S. federal agencies now face a December 2031 deadline to move digital signatures to post-quantum algorithms under Executive Order 14412, signed in June. Retail users will have to wait for wallet updates. Because the new keys come from the same recovery phrase, a leaked seed stays just as dangerous after migration, and risks such as phishing and smart contract bugs are not affected.

SUI tests $1.03 as the triangle’s apex arrives on October 18-19

The news has not lifted the price. SUI trades at $1.05, down 4.17% in 24 hours and 11.66% over the week, with a $4.33 billion market cap.

SUI/USDT 4-hour chart. Source: TradingView / Alexander Stefanov

On the 4-hour chart, SUI climbed nearly 90% from $0.68 on September 16 to $1.28 on September 27. Since the October 5 high near $1.25, each rebound has peaked lower, most recently at $1.14 on October 12. That falling line now coincides with the 50-period average, about eight days of trading, at $1.105. Buyers defended $1.03 on October 8 and again today, when the price briefly dipped to $1.00 before closing back above support. The 200-period average, covering roughly 33 days, sits at $1.029, on the same spot.

Together, these lines form a descending triangle that converges around October 18-19. The pattern breaks lower more often than higher, but its position above a rising 200-period average keeps a rebound possible. RSI at 42 shows sellers in control, while staying well above 30, the level where selling usually starts to fade.

SUI levels that decide the triangle $1.28September peak $1.11Trendline and 50-period average $1.05Current price $1.03Triangle base and 200-period average $0.980.5 Fibonacci retracement $0.910.618 Fibonacci retracement

A 4-hour close below $1.03 would point toward $0.98 and then $0.91. Reclaiming $1.11 would put $1.25 and $1.28 back in play. Selling volume on the October 8 drop was heavier than buying volume on the recent rebounds, which still favors sellers.

The next protocol checkpoint is ML-DSA-65 accounts reaching Testnet before year-end. That will be the first chance for wallets and exchanges to rehearse key derivation and address aliasing without real funds at risk.

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