sentences:  This value, an elliptic curve point, combines the function of public key data and CA signature.ECQV implicit certificates can therefore be considerably smaller than explicit certificates, and so are useful in highly constrained environments such as Radio-frequency Identification RFID tags, where not a lot of memory or bandwidth is available.ECQV certificates are useful for any ECC scheme where the private and public keys are of the form ( "d", "dG" ).