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Type using barcode drawer for visual studio .net control to generate, create qrcode image in visual studio .net applications. Microsoft Office Official Website CHAPTER 7 / ELECTRONIC MAIL SECURITY Table 7.7 S/MIME Content Types Subtype Signed pkcs7-m .NET QR-Code ime pkcs7-mime pkcs7-mime pkcs7-mime pkcs7signature signedData envelopedData degenerate signedData CompressedData signedData. smime Parameter Description A clear-signed message in two parts: one is the message and the other is the signature. A signed S/MIME entity. An encrypted S/MIME entity.

An entity containing only public-key certificates. A compressed S/MIME entity. The content type of the signature subpart of a multipart/signed message.

. Multipart Application ENVELOPEDDATA An application/pkcs7-mime subtype is used for one of four categories of S/MIME processing, each with a unique smime-type parameter. In all cases, the resulting entity (referred to as an object) is represented in a form known as Basic Encoding Rules (BER), which is defined in ITU-T Recommendation X.209.

The BER format consists of arbitrary octet strings and is therefore binary data. Such an object should be transfer encoded with base64 in the outer MIME message. We first look at envelopedData.

The steps for preparing an envelopedData MIME entity are 1. Generate a pseudorandom session key for a particular symmetric encryption algorithm (RC2/40 or triple DES). 2.

For each recipient, encrypt the session key with the recipient s public RSA key. 3. For each recipient, prepare a block known as RecipientInfo that contains an identifier of the recipient s public-key certificate,3 an identifier of the algorithm used to encrypt the session key, and the encrypted session key.

4. Encrypt the message content with the session key. The RecipientInfo blocks followed by the encrypted content constitute the envelopedData.

This information is then encoded into base64. A sample message (excluding the RFC 5322 headers) is Content-Type: application/pkcs7-mime; smime-type=envelopeddata; name=smime.p7m Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.

p7m rfvbnj756tbBghyHhHUujhJhjH77n8HHGT9HG4VQpfyF467GhIGfHfYT6 7n8HHGghyHhHUujhJh4VQpfyF467GhIGfHfYGTrfvbnjT6jH7756tbB9H f8HHGTrfvhJhjH776tbB9HG4VQbnj7567GhIGfHfYT6ghyHhHUujpfyF4 0GhIGfHfQbnj756YT64V. This is an X.509 certificate, discussed later in this section. 7.2 / S/MIME To recover the visual .net qr barcode encrypted message, the recipient first strips off the base64 encoding. Then the recipient s private key is used to recover the session key.

Finally, the message content is decrypted with the session key. SIGNEDDATA The signedData smime-type can be used with one or more signers. For clarity, we confine our description to the case of a single digital signature.

The steps for preparing a signedData MIME entity are 1. 2. 3.

4. Select a message digest algorithm (SHA or MD5). Compute the message digest (hash function) of the content to be signed.

Encrypt the message digest with the signer s private key. Prepare a block known as SignerInfo that contains the signer s publickey certificate, an identifier of the message digest algorithm, an identifier of the algorithm used to encrypt the message digest, and the encrypted message digest..

The signedData entity consists of a series of blocks, including a message digest algorithm identifier, the message being signed, and SignerInfo. The signedData entity may also include a set of public-key certificates sufficient to constitute a chain from a recognized root or top-level certification authority to the signer. This information is then encoded into base64.

A sample message (excluding the RFC 5322 headers) is Content-Type: application/pkcs7-mime; smime-type=signeddata; name=smime.p7m Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7m 567GhIGfHfYT6ghyHhHUujpfyF4f8HHGTrfvhJhjH776tbB9HG4VQbnj7 77n8HHGT9HG4VQpfyF467GhIGfHfYT6rfvbnj756tbBghyHhHUujhJhjH HUujhJh4VQpfyF467GhIGfHfYGTrfvbnjT6jH7756tbB9H7n8HHGghyHh 6YT64V0GhIGfHfQbnj75 To recover the signed message and verify the signature, the recipient first strips off the base64 encoding.

Then the signer s public key is used to decrypt the message digest. The recipient independently computes the message digest and compares it to the decrypted message digest to verify the signature. CLEAR SIGNING Clear signing is achieved using the multipart content type with a signed subtype.

As was mentioned, this signing process does not involve transforming the message to be signed, so that the message is sent in the clear. Thus, recipients with MIME capability but not S/MIME capability are able to read the incoming message. A multipart/signed message has two parts.

The first part can be any MIME type but must be prepared so that it will not be altered during transfer from source to destination. This means that if the first part is not 7bit, then it needs to be encoded.
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