Computer Security Resource Center

Computer Security Resource Center

Computer Security
Resource Center

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Header

Abbreviation(s) and Synonym(s):

None

Definition(s):

  A portion of a packet that contains layer-specific information such as addresses.
Source(s):
NIST SP 800-113

  The section of an email message that contains vital information about the message, including origination date, sender, recipient(s), delivery path, subject, and format information. The header is generally left in clear text even when the body of the email message is encrypted.
Source(s):
NIST SP 800-45 Version 2