# Advisory: secret size attack on cross-chain hash lock smart contracts

**URL:** <https://bisq.community/t/advisory-secret-size-attack-on-cross-chain-hash-lock-smart-contracts/4839>\
**Category:** Uncategorized\
**Created:** [February 19, 2018, 5:15pm UTC](https://bisq.community/t/advisory-secret-size-attack-on-cross-chain-hash-lock-smart-contracts/4839 "2018-02-19T17:15:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![CMaurice](https://bisq.community/letter_avatar/cmaurice/32/6_22734026db12803ebb3e059622ac3534.png) [@CMaurice](https://bisq.community/u/CMaurice)\
**Post date:** [February 19, 2018, 5:15pm UTC](https://bisq.community/t/advisory-secret-size-attack-on-cross-chain-hash-lock-smart-contracts/4839/1 "2018-02-19T17:15:56Z")

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> <https://gist.github.com/markblundeberg/7a932c98179de2190049f5823907c016>

I have no idea if applicable to Bisq, but thought I’d post just in case.

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**Author:** ![alexej996](https://bisq.community/user_avatar/bisq.community/alexej996/32/491_2.png) [@alexej996](https://bisq.community/u/alexej996)\
**Post date:** [February 19, 2018, 6:26pm UTC](https://bisq.community/t/advisory-secret-size-attack-on-cross-chain-hash-lock-smart-contracts/4839/2 "2018-02-19T18:26:31Z")

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Document seem pretty interesting 🙂 However Bisq doesn’t use atomic swaps, but just regular multisigs on Bitcoin blockchain.

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**Author:** ![CMaurice](https://bisq.community/letter_avatar/cmaurice/32/6_22734026db12803ebb3e059622ac3534.png) [@CMaurice](https://bisq.community/u/CMaurice)\
**Post date:** [February 19, 2018, 6:54pm UTC](https://bisq.community/t/advisory-secret-size-attack-on-cross-chain-hash-lock-smart-contracts/4839/3 "2018-02-19T18:54:56Z")

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Good, and thanks: I didn’t know that