The Cryptographic Security of Compact Knapsacks (Preliminary Report)
Name
MIT-LCS-TM-164.pdf
Size
3.02 MB
Format
Adobe PDF
Checksum (MD5)
946a6067427463d59bfa01eb44f46fc4
Author(s)
Shamir, Adi
Date Issued
April 1980
Series/Report no.
MIT-LCS-TM-164
Abstract
In 1978, Merkle and Hellman introduced a knapsack-based public-key cryptosystem, which received widespread attention. The two major open problems concerning this cryptosystem are: (i) Security: How difficult are the Merkle-Hellman knapsacks? (ii) Efficiency: Can the huge key size be reduced? In this paper we analyze the cryptographic security of knapsack problems with small keys, develop a new (non-enumerative) type of algorithm for solving them, and use the algorithm to show that under certain assumptions it is as difficult to find the hidden trapdoors in Merkle-Hellman knapsacks as it is to solve general knapsack problems.
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