Abstract: An example operation may include one or more of storing a broadcast encryption tree comprising a set of cryptographic keys disposed in a hierarchical tree format, distributing a partial set of keys from the broadcast encryption tree to each respective peer from among a group of peers included in a blockchain network, receiving, from a user device, an identification of at least one peer included in the group of peers for processing a blockchain transaction, selecting a subset of keys from among the set of cryptographic keys in the broadcast encryption tree which enables at least one peer to decrypt transactions and doesn't enable the remaining peers included in the group of peers to decrypt transactions, and transmitting broadcast encryption information about the selected subset of keys to the user device for performing encryption of the transactions.

Abstract: An example operation may include one or more of storing a broadcast encryption tree comprising a set of cryptographic keys disposed in a hierarchical tree format, distributing a partial set of keys from the broadcast encryption tree to each respective peer from among a group of peers included in a blockchain network, receiving, from a user device, an identification of at least one peer included in the group of peers for processing a blockchain transaction, selecting a subset of keys from among the set of cryptographic keys in the broadcast encryption tree which enables at least one peer to decrypt transactions and doesn't enable the remaining peers included in the group of peers to decrypt transactions, and transmitting broadcast encryption information about the selected subset of keys to the user device for performing encryption of the transactions

Abstract: A method and system for transferring contact information and calendar events (FIG. 1, 131) to a wireless device (FIG. 1,141) via e-mail (FIG. 9) are described. In one embodiment, the method comprises providing for one or more contacts (FIG. 10) to be included in an e-mail message (FIG. 14,1412) addressed to a unique e-mail address (FIG. 15,1522). The e-mail message is received at a server (FIG. 1,161) associated with the unique e-mail address. The one or more contacts are extracted from the e-mail message (FIG. 15,1524). A wireless device to send the one or more contacts to (FIG. 1,141) is determined by extracting delivery data contained in the e-mail message (FIG. 15,1512). One or more messages formatted specifically for the wireless device are generated (FIG. 9), wherein the one or more messages contain the one or more contacts (FIG. 10). The server checks if the wireless device is registered with the server (FIG.