By Whitfield Diffie (auth.), Jean-Jacques Quisquater, Joos Vandewalle (eds.)
‘I’he int,ernational organization for Cryptologic study (IACK) organizes inter- tioilill coiifcrcnces each year, one in Europe and one within the usa. EUROCRI’PT ’89 was once the 7th eu convention and was once held in Houthalen, Belgium on April 10-13, 1989. With on the subject of three hundred members, it used to be might be the most important open conferencr on c:rypt,ogra.phy ever held. the sphere of cryptography is increasing not just as a result of the elevated vulnerability of desktops and networks to a11 expanding variety of threats, but in addition due to t1ic ra.pid development in cryptographic equipment, that t,he readers can witness by means of analyzing the e-book. the current lawsuits include approximately all contributions that have been offered together with the talks on the rump consultation. The chapters correspond to the classes on the convention. It wa5 the 1st time rump consultation was once prepared on a Eurocrypt convention. 16 impromptu talks got, and the authors have been invited to post brief abstracts in their shows. as a result of the precise personality of this consultation, the editors have taken the freedom to shorten a few of these.
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Extra info for Advances in Cryptology — EUROCRYPT ’89: Workshop on the Theory and Application of Cryptographic Techniques Houthalen, Belgium, April 10–13, 1989 Proceedings
Example text
As the amount of data needed for the protocol is small and these data are rarely changing and not sensitive, there is no direct demand for a CSC as mentioned in the previous section. Even if a CSC were used for logging established connections, its failure would not crash the whole cryptographic system. So its availability is less important than it was in SELAXE. The protocol in this form ensures B that A is authentic but not vice versa. This is acceptable if B is a host and A a user. However it is desirable that both communicating parties are sure about each other's identity, especially in a network with equivalent nodes that are clients as well as servers to other nodes.
4. The trivial cases t A = 1 or b A = 0 have to be avoided. 5 . m > 1 or h > 1 sigdicantly decrease the probability that (ab-)user C pretending to be A can successfully guess the matrix ( ( b A , j , j ) ) and "tune" ~ his Z A , ~and U A , accordingly. 6. If m > 1, the S A , ~must be stored in secure memory. Otherwise a number of conspiring users would be able to pool their information to create new valid IDSwithout participation of SKIA. 7. h > 1 leads to the problem of having to combine several Z A , during ~ the key exchange.
M Z,-I and computes r A := u k A in GF(q) I A , j := f ( n a r n e A , j ) chooses a random liA E determines solutions s A , j of X , T ~+ k A s A , j I A , j mod ( q - I) for j = 1,.. 4, s,4,1,.. , S A , ~ Authentication of user A versus host B: A B nu meA)T A for j = 1,. . , rn computes I A , j = f(nameA,j> 42 chooses random t ~ , Ei Z,-1 computes z A , i := rltAbiin G F ( ~ ) zA,i accepts the authentication if for dl i = I , . . ,h YA,= ~ 0 Now consider the case rn = 1 and h = 1. Observation: There is the value ZA = T - ~ A the form of which resembles the public parts of the key in the Dae-Hellman protocol.