Patent ID: 7860243
Filing Date: 2010-12-28
Classification: H04L

Abstract:
1. A method for public key encryption for groups, the method comprising: generating a group public key and a group leader private key by a group leader of a group having at least one group member., creating an individual private key for each group member by the group leader, distributing the individual private key to each group member by the group leader, receiving by the group from a user a message encrypted using the group public key wherein the message is encrypted using RSA asymmetric encryption, and decrypting the encrypted message received by the group from the user by at least one group member using its individual private key, independently of the other group members, wherein the individual private key is created for each group member according to formula (5): wherein d M is the number of members in the group, d is a private exponent, e is a public exponent, p is a prime number, q is a prime number, ID Z is a data string that is shared among all group members, N =p·q, and φ(N) is =(p−1 )(q−1 ).