Pre-Grant Publication Number: 20070160202
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LATEST PRIOR ART
| Date | Title | Reviewer |
|---|---|---|
| 10/28/07 | RE: A New Triple-DES Key Wrap Algorithm | G. R. Konrad Roeder |
| 10/27/07 | Cryptographic Message Syntax | Rob Cameron |
| 10/26/07 | Password-based Encryption for S/MIME | G. R. Konrad Roeder |
DISCUSSION
G. R. Konrad Roeder (6 months ago)
Regarding Claim 00007
"wherein the encryption key is a public key; and
wherein the decryption key is a private key."
Assuming that <decription key> and <??description key??> are the same thing, then this means that the decryption key is used to decrypt the user data key. In the state of the art, this is the KEK.
The user data is decrypted with the user data key. In the state of the art, this is the CEK.
In Claim 0001 the CEK layer could be either symmetric or asymmetric. In this case, the CEK layer is defined to be an asymmetric crypto algorithm.
Many specifications (including S/MIME) have two layers: message encrypted with symmetric key
symmetric key encrypted with public key (May 2002) Slide 11
www.rsa.com/rsalabs/staff/bios/bkaliski/publications/other/kaliski-key-encapsulation-rsa-2002j.ppt
Slide 30 shows all the standards that use key encapsulation (message encrypted with symmetric key symmetric key encrypted with public key)
Slide 16 shows the integrity concept was already understood in 2002.
G. R. Konrad Roeder (6 months ago)
Regarding Claim 00001
"decrypting the encrypted [user data key] with a <decryption key> in response to an initiation of a decryption of the encrypted user data with the [user data key] as decrypted with the <??description key??>;
decrypting a verification text with the [user data key] as decrypted with the <decryption key>;
validating a use of the [user data key] as decrypted with the <decryption key> to decrypt the encrypted user data in response to a matched comparison of the verification text as decrypted with the [user data key] and an intermixing of a known text and a random text; and
invalidating the use of the [user data key] as decrypted with the <decryption key> to decrypt the encrypted user data in response to a mismatched comparison of the verification text as decrypted with the [user data key] and the intermixing of the known text and the random text."
I am a bit confused by their intermixed use of <decryption key> and <??description keys??>. I have to assume it's a typo that a spell checker would not find and assume that <decryption key> and <??description key??> are really the same thing. This needs to be clarified.G. R. Konrad Roeder (6 months ago)
Regarding Claim 00006
"decrypting the first grouping of the first known text segment and the first random text segment with the user data key as decrypted with the decryption key; and
decrypting the second grouping of the second known text segment and the second random text segment with the user data key as decrypted with the decryption key."
This looks like the decryption counterpart of claim 5. ObviousPEER TO PATENT ACTIVITY
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