Encapsulation of public key cryptography standard number 7 into a secured document
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United States of America Patent
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Mar 20, 2001
Grant Date -
N/A
app pub date -
Aug 28, 1998
filing date -
Aug 28, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A secured access to data in a portable document format (PDF) file is provided by encapsulating a Public Key Cryptography Standard number 7 (PKCS#7) object having a recipient list into data. `Enveloped data` encapsulated in the PKCS#7 object contains access information that is used to access the remainder of the document into which the PKCS#7 object is encapsulated. The access information can be decrypted by all recipients in the PKCS#7 recipient list. If a recipient listed in the recipient list attempts to access data in the document, the access information is decrypted using the recipient's private key. The access information is used to obtain an access key that is used to decrypt data in the document.
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