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- W2951718770 abstract "The Cipher Block Chaining (CBC) Message Authentication Code (MAC) is an authentication method which is widely used in practice. It is well known that the use of the CBC MAC for variable length messages is not secure, and a few rules of thumb for the correct use of the CBC MAC are known by folklore. The first rigorous proof of the security of CBC MAC, when used on fixed length messages, was given only recently by Bellare et al.[3]. They also suggested variants of CBC MAC that handle variable-length messages but in these variants the length of the message has to be known in advance (i.e., before the message is processed).We study CBC authentication of real-time applications in which the length of the message is not known until the message ends, and furthermore, since the application is real-time, it is not possible to start processing the authentication until after the message ends.We first consider a variant of CBC MAC, that we call the encrypted CBC MAC (EMAC), which handles messages of variable unknown lengths. Computing EMAC on a message is virtually as simple and as efficient as computing the standard CBC MAC on the message. We provide a rigorous proof that its security is implied by the security of the underlying block cipher. Next, we argue that the basic CBC MAC is secure when applied to a prefix-free message space. A message space can be made prefix-free by also authenticating the (usually hidden) last character which marks the end of the message." @default.
- W2951718770 created "2019-06-27" @default.
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- W2951718770 date "1997-01-01" @default.
- W2951718770 modified "2023-09-26" @default.
- W2951718770 title "CBC MAC for Real-Time Data Sources." @default.
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