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On the Security of Blockwise Secure Modes of Operation Beyond the Birthday Bound

机译：关于生日界限之外的逐块安全操作模式的安全性

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摘要

In 2002, in two independent papers, Bellare, Kohno, and Namprempre and Joux, Martinet, and Valette introduced the notion of blockwise security for modes of operations. This notion stems from common practice, since in many applications, modes of operation for block ciphers do not process messages as atomic entities but in a incremental manner, block after block. Soon afterward, several papers showed that many modes of operation are already blockwise secure and that others can be made secure by simple modifications. In this paper, we revisit these results, by comparing possible attacks on modes of operation after the birthday bound is reached. Amusingly, in spite having essentially identical security proofs up to this bound, modes of operation in the blockwise model behave very differently than their counterparts in the regular model, once the birthday paradox bound is crossed.
机译：在2002年，Bellare，Kohno和Namprempre以及Joux，Martinet和Valette在两篇独立的论文中介绍了操作模式的分块安全性概念。此概念源于常规做法，因为在许多应用中，分组密码的操作模式不会将消息作为原子实体处理，而是以增量方式逐块处理。此后不久，几篇论文表明许多操作模式已经是逐块安全的，而其他模式可以通过简单的修改来确保安全。在本文中，我们通过比较在达到生日界限后可能对操作模式的攻击来重新审视这些结果。有趣的是，尽管在此界限上具有基本相同的安全性证明，但一旦越过了生日悖论界限，块状模型中的操作模式就会与常规模型中的操作模式有很大不同。

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