Ethereum RD Messenger in Python (by @drdr_zz).

UPDATE Check out JavaScript online version: https://securing.github.io/eth-rd-messenger/

This tool is used to:

• send a secret message to the owner of a personal or contract Ethereum address, encypted with its owner ECC public key,
• decrypt the message sent to the personal address or contract's owner.

Motivation

When doing research in the field of Ethereum Smart Contract security I came across a problem in finding the owner of the vulnerable contracts. This is particularly important for publicly available smart contracts, where time plays a crucial role.

When you, as an ethical hacker, want to report the vulnerability you can either:

• exploit it illegally and start looking for the owner (we don't want to do that), or
• start looking for the owner and hope that noone exploits the vulnerability (we don't want to do that either).

I want to use this tool for Responsible Disclosure. I firstly leave the encrypted, unmodifiable and undeniable message (in the end it's blockchain) where to find the stolen Ether and then exploit the vulnerability.

Usage

python eth-messenger.py [options]

Options

• -h, --help - print a help message.
• -l, --list - list all accounts.
• -e <address>, --encrypt=<address> - encrypt message for the owner of .
• -d <tx_hash>, --decrypt=<tx_hash> - decrypt message sent in <tx_hash>.
• -m <message>, --message=<message> - specify the message to encrypt.
• -s, --send - send encrypted message.
• -f <sender_address>|<index>, --from=<sender_address>|<index> - specify your sender address explicitly or with its index (see accounts list) [default: 0].
• -p <tx_hash>, --sent-transaction=<tx_hash> - specify the hash of any out transaction sent by (use it when the the is personal).
• -c <tx_hash>, --creation-transaction=<tx_hash> - specify the hash of transaction that created contract (use it when the the is contract).
• -t, --testnet - use ropsten network.
• -i <path>, --ipcpath=<path> - specify the path to geth.ipc file.

Example

python eth-messenger.py -t -e 0x3b752fd232ed1a110af83c4d955c044251be0d23 -m "TEST" -s -f 0

Using the above command, the messenger will:

• encrypt the message TEST with the public key of the owner of 0x3b752fd232ed1a110af83c4d955c044251be0d23 address,
• send the transaction with encypted message from the first local account.

python eth-messenger.py -t -d 0xc490405c22e65008ec79bd80a532ffdfa1bdaa44e23bda034fea5569358cb130

Using the above command, the messenger will:

• read the address of the message receiver and encrypted message from 0xc490405c22e65008ec79bd80a532ffdfa1bdaa44e23bda034fea5569358cb130 transaction data,
• ask for the private key of the receiver,
• decrypt the message with the private key of the owner,
• print decrypted message.

License

See the LICENSE file.