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Azure Storage account shared access signature for high risk resources (preview)

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This SIT is also included in the All credentials bundled SIT.

Format

A combination of 44 characters consisting of letters, digits, and special characters.

or

A combination of up to 76 characters consisting of letters, digits, and special characters.

Pattern

Any combination of 43 characters consisting of:

  • a-z (not case-sensitive)
  • 0-9
  • forward slashes (/)
  • or plus signs (+)
  • ends with an equal sign (=)

for example:

abcdefghijklmnopqrstuvwxyz0123456789/+ABCDE=

or

Any combination of 43 to 73 characters consisting of:

  • a-z (not case-sensitive)
  • 0-9
  • or percent signs (%)
  • ends with a suffix '%3d' (not case-sensitive)

for example:

abcdefghijklmnopqrstuvwxyz0123456789%2F%2BABCDE%3D

Credential example

https://account.blob.core.windows.net/file.cspkg?...&sig=abcdefghijklmnopqrstuvwxyz0123456789%2F%2BABCDE%3D

Checksum

No

SITs that have checksums use a unique calculation to check if the information is valid. This means when the Checksum value is Yes, the service can make a positive detection based on the sensitive data alone. When the Checksum value is No additional (secondary) elements must also be detected for the service to make a positive detection.

Keyword Highlighting

Supported

When keyword highlighting is supported in the contextual summary for a sensitive information type or a trainable classifier, in the Contextual Summary view of activity explorer, the keywords in a document that were matched to a policy are highlighted.

Definition

This SIT is designed to match the security information that's used to grant restricted access rights to high risk Azure Storage resources such as certificates, configurations, or deployment packages.

It uses several primary resources:

  • Patterns of Base64 encoded 256-bits symmetric key.
  • Patterns of URL Encoded 256-bits symmetric key.
  • Patterns of CredentialName, CredentialFeatures, AccountIdentityName, AccountIdentityValue, ResourceType, ResourceName, Id.
  • Patterns of mockup values, redactions, and placeholders.
  • A dictionary of vocabulary

The patterns are designed to match actual credentials with reasonable confidence. The patterns don't match credentials formatted as examples. Mockup values, redacted values, and placeholders, like credential type or usage descriptions, in the position where an actual secret value should present won't be matched.

Keywords

Keyword_SymmetricKey256:

  • SharedAccessKey
  • AccountKey

Keyword_SymmetricKey256UrlEncoded:

  • sig=
  • key
  • token
  • secret
  • password