E-mail firewall with policy-based cryptosecurity
AssigneeAxway Inc.
InventorsRobert D. Dickinson, III, Sathvik Krishnamurthy
Life of this patent
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Abstract
An e-mail firewall applies policies to e-mail messages between a first site and second sites in accordance with administrator selectable policies. The firewall includes a simple mail transfer protocol relay for causing the e-mail messages to be transmitted between the first site and selected ones of the second sites. Policy managers enforce-administrator selectable policies relative to one or more of encryption and decryption, signature, source/destination, content and viruses.
Claims2
A method for filtering email messages transmitted from an external site to an internal site associated with a first policy, comprising:
- intercepting an e-mail message having a sender address associated with an external site;
- ii. detecting whether the message includes a digital signature;
- iii. applying at least one policy condition to said e-mail message, said policy condition applied by reference to said digital signature, said applying providing a policy application result;
- iv. applying at least a second policy condition to said e-mail message in response to a predetermined condition of the digital signature, the second policy condition selected by reference to an identity associated with the valid digital signature;
- v. detecting that the digital signature is a valid digital signature;
- and
- vi. processing said e-mail message in accordance with said applying of the second policy.
A method for filtering e-mail messages transmitted from an external site to an internal site associated with a first policy, comprising:
- intercepting an e-mail message having a sender address associated with an external site;
- ii. detecting whether the message includes a digital signature;
- iii. applying at least one policy condition to said e-mail message, said policy condition applied by reference to said digital signature, said applying providing a policy application result;
- iv. applying a second policy for detecting whether the signature is associated with a domain which is included in a stored list of trusted domains;
- and
- vi. processing said application level email message in accordance with said applying of the second policy.
Dependencies are inferred from the claim text.