Secure Erasure Code-Based Distributed Storage System with Secure Data Forwarding

IntroductionConstructing a secure storage system that supports multiple

functions is challenging when it is distributed and has no

central authority

The proposed system consist of threshold proxy re-

encryption scheme, integrated with a decentralized erasure

code

The main focus is on designing a storage system for

robustness, confidentiality, and functionality

Modules System setup

Data storage

Data forwarding

Data retrieval

1. System setupcreate set of users, n storage servers SS1, SS2, . . .,

SSn, and m key servers KS1, KS2, . . . , KSm.Each user A is assigned a public-secret key pair

(PKA, SKA).

2.Data Storage:In the data storage phase, user A encrypts his message M

and dispatches it to storage servers.

A message M is decomposed into k blocks m1, m2..

User A encrypts each block mi into a ciphertext Ci and sends it to v randomly chosen storage servers

Each storage server linearly combines them with randomly chosen coefficients into a codeword symbol and stores it.

3.Data Forwarding:User A forwards his encrypted message with an identifier

ID stored in storage servers to user B such that B can decrypt the forwarded message by his secret key.

compute a re-encryption key RK AB

Each storage server uses the re-encryption key to re-encrypt its codeword symbol for later requests by B .

The re-encrypted codeword symbol is the combination of cipher texts under B’s public key.

4.Data Retrieval:user A requests to retrieve a message from storage

servers

User A sends a retrieval request to key servers

user A combines the partially decrypted codeword symbols to obtain the original message M.

Work Done

Setting servers and users

Each user has assigned with a key pair

Selecting a file

Splitting file into blocks

Encrypting each block

Sending cipher text to storage server

Work To Be Done

Encoding each block and storing.

Data Forwarding

Generating re-encryption key

Re-encrypting codeword

Data Retrieval

Decrypting each block

Combing all blocks

THANK YOU