Graph Crypto-Stego System for Securing Graph Data Using Association Schemes

Algorithm 2

Algorithm for extracting secret data from graph stego image.

1: Input: Graph Stego Image(GSI), AS key(k)

2: Output: Secret Data retrieved

3: procedure Decryption

   1. Obtain the hidden data and number of nodes from RGB components of the GSI.

   2. Find decryption key as discussed in Theorem 1 from key .

   3. Find such that .

   4. Apply relation of AS over (as defined in Theorem 1) on to obtain decrypted graph data.

4: end procedure