A "Final" Security Bug

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Authors Quan Thoi Minh Nguyen arXiv ID 2004.01403 Category cs.CR: Cryptography & Security Citations 0 Venue IACR Cryptology ePrint Archive Last Checked 4 months ago
Abstract
This article discusses a fixed critical security bug in Google Tink's Ed25519 Java implementation. The bug allows remote attackers to extract the private key with only two Ed25519 signatures. The vulnerability comes from the misunderstanding of what "final" in Java programming language means. The bug was discovered during security review before Google Tink was officially released. It reinforces the challenge in writing safe cryptographic code and the importance of the security review process even for the code written by professional cryptographers.
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