https://research.kudelskisecurity.com/2018/01/16/blockchains-how-to-steal-millions-in-264-operations/TL;DR: you can hijack certain Lisk accounts and steal all their balance after only 264 evaluations of the address generation function (a combination of SHA-256, SHA-512, and a scalar multiplication over Ed25519s curve).
And theres more: secret keys arent secret
Ah, and theres another security issue in Lisk: looking at the client API documentation, youll notice that clients need to send their passphrase (the secret value) to open an account or to send a transaction. In other word, Lisk is missing the whole point of public-key cryptography, which is to keep secret keys secret. Oh, and theres even an endpoint (/api/accounts/open) that allows you to request your public key given your secret key. So much for trustlessness and decentralization.
LiskHQ any comment on this?