Comparing SMIME and RM


Comparing S/MIME and RM

Secure/Multipurpose Internet Mail Extensions (S/MIME) and RM have both overlapping as well as complementary features when compared side-by-side. Most organizations would find that neither solution fulfills all their security requirements and business functionality when deployed alone. In general, S/MIME adds public key encryption and support for digital signatures to Multipurpose Internet Mail Extensions (MIME). S/MIME provides two core pieces of functionality: digital signatures and encryption. RM provides similar encryption functionality end to end, but it enhances this functionality through policy enforcement and content permissions. Table 12-1 compares the properties and features that distinguish S/MIME digital signing, S/MIME encryption, and IRM.

Table 12-1: S/MIME Digital Signing, S/MIME Encryption, and IRM

Feature

S/MIME Signing

S/MIME Encryption

IRM

Authenticates the sender and provides nonrepudiation of message

Yes

No

No

Authenticates the recipient

No

Yes

Yes

Allows two-factor authentication

Yes

Yes

No

Can encrypt content

No

Yes

Yes

Prevents content tampering

Yes

Yes

Yes

Offers content expiration

No

No

Yes

Controls content reading, forwarding, saving, modifying, or printing by recipient

No

No

Yes

Differentiates permissions by recipient

No

No

Yes

Supported by Office 2003 and Exchange Server 2003

Yes

Yes

Yes

Access mail through Microsoft Outlook Web Access

Yes (Exchange Server 2003 only)

Yes (Exchange Server 2003 only)

Yes (Windows IE only)

Supports large RSA key sizes and pluggable algorithms

Yes

Yes

No

Cross-platform interoperability

Yes

Yes

No

Message size compression

No

No

Yes




Secure Messaging with Microsoft Exchange Server 2003
Secure Messaging with MicrosoftВ® Exchange Server 2003 (Pro-Other)
ISBN: 0735619905
EAN: 2147483647
Year: 2004
Pages: 189

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