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Password-Hardened Encryption (PHE) protects against offline brute-force attacks by involving an external ratelimiter that enforces rate-limited decryption without learning passwords or keys. Threshold Password-Hardened Encryption (TPHE), introduced by Brost et al. (CCS’20), distributes this trust among multiple ratelimiters. Despite its promise, the security foundations of TPHE remain unclear. We make three contributions:

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Universally Composable Password-Hardened Encryption

  • 会议论文

  • 发表日期：

    2026年

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  • Behzad Abdolmaleki,
  • Ruben Baecker,
  • Paul Gerhart,
  • Mike Graf,
  • Mojtaba Khalili,
  • Daniel Rausch,
  • Dominique Schröder

摘要

Password-Hardened Encryption (PHE) protects against offline brute-force attacks by involving an external ratelimiter that enforces rate-limited decryption without learning passwords or keys. Threshold Password-Hardened Encryption (TPHE), introduced by Brost et al. (CCS’20), distributes this trust among multiple ratelimiters. Despite its promise, the security foundations of TPHE remain unclear. We make three contributions: