Authentication in Java

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Authentication
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Figure 73-6: A security hole in protocol ap50 In the scenario in Figure 73-6, Bob and Alice might together eventually discover that something is amiss, as Bob will claim to have interacted with Alice, but Alice knows that she has never interacted with Bob There is an even more insidious attack that would avoid this detection In the scenario in Figure 73-7, both Alice and Bob are talking to each other, but by exploiting the same hole in the authentication protocol, Trudy is able to transparently interpose herself between Alice and Bob In particular, if Bob begins sending encrypted data to Alice using the encryption key he receives from Trudy, Trudy can recover the plaintext of the communication from Bob to Alice At the same time, Trudy can forward Bob's data to Alice (after re-encrypting data using Alice's real public key)
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Authentication
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Figure 73-7: A "man-in-the-middle" attack Bob is happy to be sending encrypted data, and Alice is happy to be receiving data encrypted using her own public key; both are unaware of Trudy's presence Should Bob and Alice meet later and discuss their interaction, Alice will have received exactly what Bob sent, so nothing will be detected as being amiss This is one example of the so-called man-in-the-middle attack (more appropriately here, a "woman-in-the-middle" attack) It is also sometimes known as a bucket-brigade attack, since Trudy's passing of data between Alice and Bob resembles the passing of buckets of water along a chain of people (a so-called "bucket brigade") who are putting out a fire using a remote source of water
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References
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[Cert 96] CERT, "Advisory CA-9621: TCP SYN Flooding and IP Spoofing Attacks," http://wwwcertorg/ advisories/indexhtml
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Authentication
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[Jimenez 1997] D Jimenez, "Outside Hackers Infiltrate MIT Network, Compromise Security, " The Tech, Volume 117, Number 49 (Oct 1997) , pp 1 [Lamport 1981] Lamport, L, "Password Authentication with Insecure Communication", Communications of the ACM, Vol 24, No 11, November 1981, 770-772 [RFC 1760] N Haller, "The S/KEY One-Time Password System," RFC 1760, Feb 1995
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Copyright Keith W Ross and James F Kurose 1996-1999 All rights reserved
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Integrity
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74 Integrity
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Think of the number of the times you've signed your name to a piece of paper during the last week You sign checks, credit card statements, legal documents, and letters Your signature attests to the fact that you (as opposed to someone else) have acknowledged and/or agreed with the document's contents In a digital world, one often want to indicate the owner or creator of a document, or to signify one's agreement with a document's content A digital signature is a cryptographic technique for achieving these goals in a digital world Just as with human signatures, digital signing should be done in such a way that a digital signatures are verifiable, non-forgible, and non-repudiable That is, it must be possible to "prove" that a document signed by an individual was indeed signed by that individual (the signature must be verifiable) and that only that individual could have signed the document (the signature can not be forged, and a signer can not later repudiate or deny having signed the document) This is easily accomplished with public key cryptography
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741 Generating Digital Signatures
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Suppose that Bob wants to digitally sign a "document," m We can think of the document as a file or a message that Bob is going to sign and send As shown in Figure 74-1, to sign this document, Bob simply uses his private decryption key, dB, to compute dB(m) At first, it might seem odd that Bob is running a decryption algorithm over a document that hasn't been encrypted But recall that "decryption" is nothing more than a mathematical operation (exponentiation to the power of d in RSA; see section 72) and recall that Bob's goal is not to scramble or obscure the contents of the document, but rather to sign the document in a manner that is verifiable, non-forgible, and non-repudiable Bob has the document, m, and his digital signature of the document, dB(m)
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