Version 1: Release Note 28 November 2014


ECDSA per message secret number



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ECDSA per message secret number


When generating a Digital Signature, the Smart Metering Entity shall calculate the DSA Per-Message Secret Number ‘k’ with respect to ECDSA (with the meaning in Section 4.5 of FIPS 186-4) to be the SHA-256 hash of the concatenation of:

  • the parts of the Message to be signed, as defined in Section 7.2.7; and

  • the Private Key that the Smart Metering Entity will use in the Digital Signature generation.

If the value of k so calculated results in an ‘r’ or ‘s’ value of 0, where r and s have the meanings in the NSA’s ‘Suite B Implementor’s Guide to FIPS 186-3’, then a new value for k shall be calculated to be the SHA-256 hash of the concatenation of:

  • the parts of the Message to be signed, as defined in Section 7.2.7;

  • the Private Key that the Smart Metering Entity will use in the Digital Signature generation; and

  • 0x00.

The addition of 0x00 to the concatenation shall be repeated until a value of k is generated that does not result in an ‘r’ or ‘s’ value of 0.

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