RSA Security Projection Television 5.2.2 Instrukcja Użytkownika Pobierz pdf (Strona 327)

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Chapter 8

Secret Sharing Operations

Secret Sharing

Secret sharing allows a system to require a certain number of “shares” to retrieve a

secret. The process encrypts information and then creates a number of shares of the

encrypted information. The information can be recovered by collecting a declared

number (called the threshold) of shares. Note that the threshold must be less than or

equal to the total number of shares.

Typically, the secret is a key used for encrypting sensitive data. For example, you

might protect an RC2 key with a secret-sharing algorithm, creating four shares, and

set the threshold to two. Then any two of the four shares can reconstruct the RC2 key.

Generating Shares

Crypto-C offers the Bloom-Shamir secret sharing method. For this implementation,

the minimum total number of shares is two and the maximum is 255; the threshold

must be less than or equal to the total number of shares. The 255 limit is not part of the

Bloom-Shamir algorithm, but a constraint of the Crypto-C implementation. See Step 4

for details.

The following example will encrypt 16 bytes (for example, an RC2 key), splitting the

secret into four shares, and set the threshold to two.

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