Authenticated Encryption with Key Identification

Authenticated Encryption with Key Identification
复制标题

带有密钥识别的认证加密

DOI:
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发表时间:
2022
期刊:
IACR Cryptology ePrint Archive
影响因子:
--
通讯作者:
Thomas Ristenpart
Thomas Ristenpart
中科院分区:
--
文献类型:
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作者:
Julia Len;Paul Grubbs;Thomas Ristenpart

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.关联数据认证加密(AEAD)形成了许多对称密码学的核心,但用于建模AEAD的标准技术假设接收者对用于解密的密钥没有歧义。这与实际情况不同,例如在密钥管理服务中,消息接收者可以存储许多密钥,并且必须在解密之前识别正确的密钥。迄今为止,还没有对其安全属性或安全性进行正式调查,并且在实践中部署的用于识别预期密钥的临时解决方案可能是低效的,并且在某些情况下容易受到实际攻击。我们提供了第一个基于随机数的AEAD的形式化,支持密钥识别(AEAD-KI)。解密现在接受一个密钥向量和一个密文,并且必须同时识别正确的密钥和解密密文。我们提供了新的正式安全定义,包括新的密钥健壮性定义和不可否认性安全概念。最后,我们展示了AEAD-KI的几种不同的方法,并证明了它们的安全性。
. Authenticated encryption with associated data (AEAD) forms the core of much of symmetric cryptography, yet the standard techniques for modeling AEAD assume recipients have no ambiguity about what secret key to use for decryption. This is divorced from what occurs in practice, such as in key management services, where a message recipient can store numerous keys and must identify the correct key before decrypting. To date there has been no formal investigation of their security properties or efficacy, and the ad hoc solutions for identifying the intended key deployed in practice can be inefficient and, in some cases, vulnerable to practical attacks. We provide the first formalization of nonce-based AEAD that supports key identification (AEAD-KI). Decryption now takes in a vector of secret keys and a ciphertext and must both identify the correct secret key and decrypt the ciphertext. We provide new formal security definitions, including new key robustness definitions and indistinguishability security notions. Finally, we show several different approaches for AEAD-KI and prove their security.
DOI: 10.1007/978-3-031-07085-3_29
发表时间: 2022
期刊: --
影响因子: --
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DOI: --
发表时间: 2021
期刊: USENIX Security Symposium
影响因子: --
作者:
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DOI: --
发表时间: 2018
期刊: Advances in Cryptology - CRYPTO
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