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Efficient dispersal of information for security, load balancing, and fault tolerance-英文文献
Efficient Dispersal of Information for Security,
Load Balancing, and Fault Tolerance
MICHAEL 0. RABIN
Harvard University, Cambridge, Massachusetts
Abstract. An Information Dispersal Algorithm (IDA) is developed that breaks a file F of length
L = ( F( into n pieces F,, 1 5 i 5 n, each of length ( F, 1 = L/m, so that every m pieces suffice for
reconstructing F. Dispersal and reconstruction are computationally efficient. The sum of the lengths
( F, 1 is (n/m) . L. Since n/m can be chosen to be close to I, the IDA is space eflicient. IDA has
numerous applications to secure and reliable storage of information in computer networks and even on
single disks, to fault-tolerant and efficient transmission of information in networks, and to communi-
cations between processors in parallel computers. For the latter problem provably time-efftcient and
highly fault-tolerant routing on the n-cube is achieved, usingjust constant size buffers.
Categories and Subject Descriptors: E.4 [Coding and Information Theory]: nonsecret encoding schemes
General Terms: Algorithms, Verification
Additional Key Words and Phrases:Fault tolerance, parallel computers, routing of data, storage of data
1. Introduction
The storage and transmission of data tiles in distributed systems gives rise to
significant security and reliability problems. We may assume the availability of a
dependable encryption system, but even then various dangers remain. Consider a
user who keeps tiles at a certain workstation. By encrypting the files and taking
appropriate care of the encryption/decryption keys, the user ensures the confiden-
tialily of the information when other peop
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