--- title: Is Litecoin quantum-safe? chain: Litecoin ticker: LTC hardy_score: 12.5 rank: 20 of 23 tier: "5: Exposed" url: "https://hardyindex.com/chains/litecoin" updated: 2026-08-12 methodology_version: 1.1 --- # Is Litecoin quantum-safe? **Hardy Score 12.5 / 100. Rank 20 of 23. Tier 5: Exposed. As of 12 August 2026.** No. Litecoin is derived from Bitcoin's codebase and signs with ECDSA on the secp256k1 curve, which a sufficiently large quantum computer would break. We found no published post-quantum roadmap or named replacement scheme for Litecoin at the time of writing. Litecoin does have one advantage that is easy to overlook and that this index credits: it has demonstrated that it can actually ship a significant consensus change. The MWEB soft fork, activating the Mimblewimble Extension Blocks upgrade, was proposed, implemented and activated on Litecoin while comparable proposals on Bitcoin remained unactivated. Governance capability is a real component of migration feasibility, and Litecoin has evidence for it where most chains have only assertions. > This is a security-readiness assessment, not investment advice. ## Summary A Bitcoin-derived chain using ECDSA on secp256k1 with no published post-quantum roadmap, though its MWEB soft fork proves it can enact consensus changes Bitcoin has not managed. ## Where we are making a judgement call Litecoin sits in Tier 5 because its mainnet signatures are quantum-vulnerable and no post-quantum proposal or roadmap specific to Litecoin was found. Its migration score of 2 is higher than several peers with identical cryptography, and that is deliberate: activating MWEB is evidence that Litecoin can enact a consensus change, which is the capability a quantum migration would ultimately require. ## Score breakdown | # | Dimension | Score | Weight | Contribution | |---:|---|---:|---:|---:| | 1 | Signature scheme | 0/10 | 30% | 0.0 | | 2 | Deployment stage | 1/10 | 25% | 2.5 | | 3 | NIST alignment | 0/10 | 15% | 0.0 | | 4 | Migration path | 2/10 | 15% | 3.0 | | 5 | Exposure | 4/10 | 10% | 4.0 | | 6 | Verification | 6/10 | 5% | 3.0 | | | **Hardy Score** | | | **12.5** | ### 1. Signature scheme: 0/10 Litecoin uses ECDSA on secp256k1, inherited from the Bitcoin codebase. Nothing post-quantum protects LTC on mainnet. Source: https://github.com/litecoin-project/litecoin ### 2. Deployment stage: 1/10 Tier 5: Exposed. Litecoin signs with ECDSA on secp256k1 and no post-quantum proposal or roadmap specific to Litecoin was found at the time of writing. Source: https://github.com/litecoin-project/litecoin ### 3. NIST alignment: 0/10 No post-quantum scheme has been named or proposed for Litecoin, so there is nothing to assess against a NIST standard. Source: https://csrc.nist.gov/pubs/fips/205/final ### 4. Migration path: 2/10 Litecoin has demonstrated it can activate a substantial consensus change, having shipped the MWEB soft fork, which is direct evidence of governance capability rather than a claim about it. It has not applied that capability to the quantum problem, and no migration plan exists. Source: https://github.com/litecoin-project/litecoin ### 5. Exposure: 4/10 Litecoin uses the UTXO model with addresses derived from public key hashes, so unspent coins have not published a key. Spending reveals it, and address reuse is common, so a meaningful share of supply sits behind revealed keys. Source: https://github.com/litecoin-project/litecoin ### 6. Verification: 6/10 The Litecoin client is open source and derived from a heavily reviewed codebase, so the signature scheme can be verified directly. There is no post-quantum claim to assess. Source: https://github.com/litecoin-project/litecoin ## Signature scheme - **On mainnet today:** ECDSA on secp256k1, inherited from Bitcoin - **Post-quantum scheme:** None proposed. No Litecoin-specific post-quantum work was found. - **NIST standard:** None adopted - **Readiness tier:** Tier 5: Exposed. The signatures securing funds on mainnet today are quantum-vulnerable, and no public post-quantum plan, proposal or research programme could be found. ## Roadmap - **2022** (shipped): Litecoin activates the MWEB soft fork, demonstrating that it can propose, implement and activate a substantial consensus change. Not post-quantum work, but directly relevant evidence of migration capability. Source: https://github.com/litecoin-project/litecoin - **No published position** (proposed): No post-quantum roadmap or improvement proposal specific to Litecoin was found at the time of writing. Source: https://github.com/litecoin-project/litecoin ## Exposure Litecoin follows Bitcoin's UTXO model, so an address is a hash of a public key and the key is published only when an output is spent. Coins received and never moved are not harvestable. As on Bitcoin, that protection erodes through address reuse and ordinary spending, and Litecoin has a long transaction history in which many addresses have been reused. Unlike Bitcoin, no independent analysis quantifying the share of Litecoin supply behind revealed keys was found, so the exposure score here reflects the address model rather than a measurement. ## Frequently asked questions ### Is Litecoin quantum-safe? No. Litecoin is derived from Bitcoin's codebase and signs with ECDSA on the secp256k1 curve, which a sufficiently large quantum computer would break. We found no published post-quantum roadmap or named replacement scheme for Litecoin at the time of writing. Litecoin does have one advantage that is easy to overlook and that this index credits: it has demonstrated that it can actually ship a significant consensus change. The MWEB soft fork, activating the Mimblewimble Extension Blocks upgrade, was proposed, implemented and activated on Litecoin while comparable proposals on Bitcoin remained unactivated. Governance capability is a real component of migration feasibility, and Litecoin has evidence for it where most chains have only assertions. ### Is Litecoin quantum-safe? No. Litecoin uses ECDSA on the secp256k1 curve, inherited from Bitcoin, which a sufficiently large quantum computer would break. We found no published post-quantum roadmap or proposal specific to Litecoin. ### Why does Litecoin score higher than Dogecoin on migration? Because it has proved it can ship a consensus change. Litecoin proposed, implemented and activated the MWEB soft fork, while comparable proposals on Bitcoin remain unactivated. That is evidence of governance capability rather than an assertion, and migration feasibility is partly a governance question. ### Does Litecoin's MWEB privacy feature help against quantum attack? No. MWEB is a privacy and scaling upgrade based on Mimblewimble. It does not change the signature scheme protecting funds, which remains ECDSA on secp256k1. Privacy and quantum safety are separate properties, and MWEB delivers the first without affecting the second. ### Could Litecoin adopt Bitcoin's post-quantum work? Plausibly. Litecoin's codebase is closely derived from Bitcoin's, so an output type such as the one proposed in BIP-360 could be adapted rather than designed from scratch. Combined with Litecoin's demonstrated ability to activate soft forks, that is a credible route, though no one has published a plan to take it. ## What this rating means if you hold Litecoin Plain-language guidance from the same publication, with no product recommendation attached. - [Is my crypto safe from quantum computers?](https://hardyindex.com/guides/is-my-crypto-safe-from-quantum-computers.md) - [How to protect your crypto from quantum computers](https://hardyindex.com/guides/how-to-protect-crypto-from-quantum-computers.md) - [All guides](https://hardyindex.com/guides.md) Nothing on this profile is sponsored and nothing on it is an affiliate link. See https://hardyindex.com/how-we-make-money.md. ## Sources 1. [Litecoin Core reference client](https://github.com/litecoin-project/litecoin): Litecoin Project (GitHub) (primary, checked 12 August 2026) 2. [BIP-360: Pay-to-Merkle-Root (P2MR)](https://github.com/bitcoin/bips/blob/master/bip-0360.mediawiki): Bitcoin Improvement Proposals (primary, checked 12 August 2026) 3. [Safeguarding cryptocurrency by disclosing quantum vulnerabilities responsibly](https://research.google/blog/safeguarding-cryptocurrency-by-disclosing-quantum-vulnerabilities-responsibly/): Google Research (primary, checked 12 August 2026) --- Methodology: https://hardyindex.com/methodology (v1.1). Cite as: The Hardy Index, "Litecoin", https://hardyindex.com/chains/litecoin, as of 12 August 2026.