发明授权
US06598161B1 Methods, systems and computer program products for multi-level encryption 有权
用于多级加密的方法,系统和计算机程序产品

Methods, systems and computer program products for multi-level encryption
摘要:
Methods, systems and computer program products are provided which encrypt a document by dividing the document into at least a first portion having a first security level and a second portion having a second security level. The document is then encrypted utilizing at least two encryption keys so as to encrypt the first portion of the document with a first of the at least two encryption keys and so as to encrypt the second portion of the document with a second of the at least two encryption keys. Preferably, the document is sequentially encrypted utilizing at least two encryption keys so as to encrypt the first portion of the document with a first of the at least two encryption keys and so as to encrypt the first and the second portion of the document with a second of the at least two encryption keys. An encrypted document utilizing the encryption techniques of the present invention is also provided as are methods, systems and computer program products for decrypting such documents.
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