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PKCS #9 Amendment for PTDs PKCS Workshop 2002 Magnus

PKCS #9 Amendment for PTDs PKCS Workshop 2002 Magnus. Motivation. Currently, there’s: No way to indicate suggested MIME type (if not given MIME message) No way to indicate device’s display/presentation capabilities So, an attacker could:

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PKCS #9 Amendment for PTDs PKCS Workshop 2002 Magnus

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  1. PKCS #9 Amendment for PTDsPKCS Workshop 2002Magnus

  2. Motivation • Currently, there’s: • No way to indicate suggested MIME type (if not given MIME message) • No way to indicate device’s display/presentation capabilities • So, an attacker could: • Disguise a message using a bogus Content-Type and/or character set • Take advantage of a particular device’s deficiencies

  3. Proposal • PKCS #9 attributes for PTD to be included in the signed message • Alleged Content-Type • Presentation Capabilities • Syntax & Value set: • Alleged Content-Type • UTF8String, value provided in CKM_CMS_SIG mechanism parameters • Presentation Capabilities • CC/PP, UAProf, something else? Or just make & model?

  4. Problems • Especially for the presentation capabilities • Change of display • Use of external speakers • Abuse of owner • Workaround • Just an open format string?

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