Comments on “mabs multicast authentication based on batch signature”
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This document summarizes and critiques the MABS-DSA protocol proposed by Zhou et al. for multicast authentication using batch verification. While MABS-DSA was intended to increase efficiency and security over other implementations, the author finds through reexamination of the arithmetic that the algorithm is actually incorrect and batch signature verification would fail almost always, even when individual packets were properly signed by an honest sender. The key issue is a flaw in protocol correctness rather than the intended security improvements.
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(b) For SSH packets, what is the advantage, if any, of not including the MAC in the scope of the packet encrytion?
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As alluded to by Palo Ebermann\'s comment, the word authentication has a different meaning in the two scenarios you mentioned.
In the key exchange phase of SSH, the purpose of authentication is to ensure to both parties that they are indeed talking to the right peer (if using mutual authentication). Typically, the server authenticates itself using its public key and the client uses a username and password.
In the SSH record layer phase (i.e., the sending of the actual application data), the purpose of authentication is to protect each individual data packet from tampering. This is achieved using the MAC. To encrypt application data SSH typically uses either AES in counter mode or in CBC mode. Neither of these modes of operation provides protection against tampering of the ciphertext. Thus they need to be accompanied with a MAC in order to detect this.
Consider e.g., the silly example where Alice sends the following message encrypted using AES in counter mode, but without any MAC: Transfer 100 USD from Alice to Bob. Then someone (Bob?) could flip a few strategically placed bits in the ciphertext, so that it would actually decrypt to Transfer 10 000 USD from Alice to Bob. instead. Note that without any MAC, it would be impossible for the recipient to notice that this ciphertext had been tampered with. Also, observe that this fact is completely independent of any key exchange that has been done prior to the tampering.
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Welcome to Grade 7 Science4not just a textbook with facts, but an invitation to
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Notice something special about this book? The page numbers follow the playful
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LDMMIA Reiki Master Spring 2025 Mini Updates
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Blessings and Happy Spring. We are hitting Mid Season.
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Comments on “mabs multicast authentication based on batch signature”
- 1. Comments on “MABS: Multicast Authentication Based on Batch Signature” Recently, Zhou et al. proposed a multicast authentication protocol named MABS employing an efficient cryptographic primitive called batch verification to authenticate arbitrary number of data packets simultaneously, and three implementations were presented: MABS-RSA, MABS- BLS, and MABS-DSA. In this letter, we are concerned with the last implementation, which is claimed to be much more efficient than the others. Our particular interest also lies in that MABS- DSA was designed to thwart a known attack against its underlying batch DSA primitive and is claimed to be with increased security. After a careful revisit of the involved arithmetic, however, we find that the real issue lies in protocol correctness rather than security; the algorithm of MABS-DSA actually does not hold as one would expect. More specifically, even if each of the data packets has been signed by an honest sender and securely delivered to the receiver, verification of the batch of signatures will still fail almost always. Ambit lick Solutions Mail Id: [email protected] , [email protected]