4 The record should include a single iris. This recommendation exists because one iris can easily satisfy 1:1 (was: Pixel Aspect Ratio (6.1) NC A 1:1)

Before · SP 800-76-1

Pixel Aspect Ratio (6.1) NC A 1:1

After · SP 800-76-2

PixelThe Aspectrecord Ratioshould (6include a single iris.1) NCThis Arecommendation exists because one iris can easily satisfy 1:1

Before · SP 800-76-1

After · SP 800-76-2

comparison accuracy objectives [IREX-III] and, moreover, a single eye will be read faster and its digital signature can be accessed and verified faster. Two eyes will be useful if one of the images is somehow of poor quality, or if one eye is somehow occasionally unavailable for authentication. Quality control of the PIV Card imagery is imperative.

6.3.2 Special case for individuals whose eyes cannot be captured In cases where an Agency elects to place iris records on PIV Cards, there may be a few instances where iris images cannot be captured (for example, due to rare medical conditions). In these cases the Card should nevertheless be populated with the special "null" iris record of Table 10 . This defines an empty but conformant instance of [IRISSTD] with an image of width and height equal to 1 pixel. The reason for doing this is to ensure that a cryptographically signed record exists on the PIV Card where it should. Implementations shall check the digital signature and shall reject all iris-based attempts at authentication

Table 10 − ISO/IEC 19794-6 profile for a null iris image stored on PIV Cards Clause or field of ISO/IEC 19794-6 ISO/IEC 19794-6 PIV Conformance Remarks Field Value Values Allowed 1. CBEFF Header MF MV Patron format PIV Multi-field CBEFF Header. Sec. 9.2 . 2.

Iris General Header Format identifier MF MV 0x49495200 IIR\0 Four byte format identifier including null terminator.