Patent ID: 6381331
Filing Date: 2002-04-30
Classification: H04L

Abstract:
An information sending system comprising:an information segmenter configured to segment information into a plurality of blocks; a first encoder configured to encrypt more than one block of the plurality of blocks using a first key; a second encoder configured to encrypt more than one block of the plurality of blocks other than the blocks encrypted by said first encoder using a second key; and an information sender configured to send outgoing information including the blocks encrypted by said first encoder and the blocks encrypted by said second encoder to a first receiver, and to send outgoing information including the blocks encrypted by said first encoder to a second receiver, wherein the first receiver being able to decrypt the blocks of the plurality of blocks encrypted by the first key and the blocks of the plurality of blocks encrypted by the second key using the first and second keys in order to understand a meaning of the information, and a second receiver being able to decrypt the blocks of the plurality of blocks encrypted by the first key using the first key in order to check the blocks encrypted by the first key.