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E-mail firewall with stored key encryption/decryption
| Details |
Inventors: Dickinson, III, Robert D.; Krishnamurthy, Sathvik;
Assignee: Tumbleweed Communications Corp. (Redwood City, CA)
Primary Examiner: Barron; Gilberto
Assistant Examiner: Callahan; Paul E.
Attorney, Agent or Firm: Skadden, Arps, Slate, Meagher & Flom LLP
An e-mail firewall (105) applies policies to e-mail messages (204) between a first site and a plurality of second sites in accordance with a plurality of administrator selectable policies (216). The firewall comprises a simple mail transfer protocol (SMTP) relay (202) for causing the e-mail messages (204) to be transmitted between the first site and selected ones of the second sites. A plurality of policy managers (216) enforce administrator selectable policies. The policies, such as encryption and decryption policies, comprise at least a first source/destination policy (218), at least a first content policy (220) and at least a first virus policy (224). The policies are characterized by a plurality of administrator selectable criteria (310), a plurality of administrator selectable exceptions (312) to the criteria and a plurality of administrator selectable actions (314, 316, 322) associated with the criteria and exceptions. The policy managers comprise an access manager (218) for restricting transmission of e-mail messages (204) between the first site and the second sites in accordance with the source/destination policy (218). The policy managers (216) further comprise a content manager (220) for restricting transmission of e-mail messages (204) between the first site and the second sites in accordance with the content policy (220), and a virus manager (224) for restriction transmission of e-mail messages (204) between the first site and the second sites in accordance with the virus policy (224). |
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DETAILED DESCRIPTION In a principal aspect, the present invention provides an e-mail firewall (105) for screening e-mail messages (204) originating in, or entering into a computer network (101, 103).
Embodiments employing the principles of the present invention advantageously take the form of an e-mail control system (105) that controls e-mail messages (204) transmitted from and received by a computing site.
The e-mail control system (105) includes a message encryptor (526) which encrypts, in accordance with at least a first stored encryption key (528), a first designated type of message (204) transmitted from the computing site.
A message decryptor (552) decrypts, in accordance with at least a second stored encryption key (528), a second designated type of message (204) received by the computing site.
A filter (216) monitors messages (204), after decryption by the decryptor (552) and before encryption by the encryptor (526), in accordance with changeable filter information (216).
A significant advantage of such embodiments is increased centralized control of e-mail policies by an organization.
All e-mail messages entering into or originating within an organization can be encrypted or decrypted and filtered in accordance with policies imposed by the organization.
Individual users of desktop computers within the organization therefore need not be concerned with ensuring that they comply with e-mail policies of the organization.
E-mail messages can be monitored for certain content, or for certain sources or destinations.
Advantageously, embodiments employing the principles of the present invention operate transparently to individual users within an organization.
For example such individual users need not be concerned with complying with encryption policies of the organization.
E-mail messages containing certain content, or originating from, or being transmitted to specified addresses or domains, can be automatically encrypted and/or filtered.
For example, if an organization (e.
g.
Company A) which frequently exchanges e-mail with another organization (e
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Cell Phones 
