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ON DIGITAL SIGNATURES Jerome Ho Saltzer MoloTo Laboratory for Computer Science Cambridge, Mass 02139 Recentlyj Diffie and Hellman [I] have suggested a novel application for cryptographic techniques: authentication of received messages without prior explicit and private agreement between sender and receiver They have used the term "digital signatures ~' to name the application~ because the problem being solved is analogous to that for which a handwritten signature is used Howeverj the scheme is less general~ in some important ways~ than traditional handwritten signatures. The limitations are sufficiently important that this short note outlines them in detail. Briefly~ Diffie and Hellman's technique is as follows. Every message originator who wishes to send messages that can be authenticated by any receiver devises a unique encipherment and decipherment function pair~ E i and Di, where the subscript i identifies the message originator. These two functions are chosen to have two properties: I) 2) For any message M, Di(Ei(M))=M. This property simply provides that an enciphered message can be deciphered. Complete knowledge of the function Di~ together with matching samples of cipher and clear text~ are not sufficient to allow deduction of the function Ei.* The message originator places on public record
ACM SIGOPS Operating Systems Review – Association for Computing Machinery
Published: Apr 1, 1978
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