Abstract: A system for authenticating a sender of an Electronic message transmitted over a telephony network assigns a public key and a private key to each of a plurality of mobile telephony numbers and thereby stores a plurality of public key over a blockchain. The public key and the private key are assigned upon registration of a mobile telephony number with a telephony service provider The Electronic message is sent to a recipient over the telephony network by creating a header, in the message, storing content that needs to be sent to a recipient. The system further analyzes the header to determine whether the mobile telephony number is present on the blockchain. If so the system further retrieves a public key corresponding to the mobile telephony number from the blockchain. The sender of the mobile telephony number is authenticated upon verifying the signature by using the public key from the blockchain.

Abstract: Disclosed is a system for authenticating a sender of an E-mail to be sent over a network. The system assigns a public key and a private key to each of a plurality of E-mail addresses and thereby stores a plurality of public key over a blockchain. The system further sends an E-mail to a recipient over a network by creating a header, in the E-mail, storing content that needs to be sent to a recipient. The system further analyzes the header to determine whether the E-mail address is present on the blockchain. If the E-mail address is present, the system further retrieves a public key, of the plurality of public keys, corresponding to the E-mail address from the blockchain. The system further authenticates the sender of the E-mail upon verifying the signature, used to sign the content, by using the public key retrieved for the E-mail address from the blockchain.

Abstract: Disclosed is a system for authenticating a caller. The system assigns a public key and a private key to each Caller Identifications (CLID), of a plurality of CLIDs pertaining to a plurality of mobile telephony numbers. The system stores a plurality of CLIDs and a plurality of public keys, associated to the plurality of CLIDs, over a blockchain formed by the plurality of telephony service providers. The system sends a Multi Data Message Format (MDMF) message to a telephony service provider of a callee. The system analyzes the MDMF message to determine whether the CLID is present over the blockchain. The system enables the telephony service provider of the callee to retrieve a public key, of the plurality of public keys, corresponding to the CLID from the blockchain, when the CLID is present on the blockchain. The system authenticates the caller upon verifying the signature by using the public key.