The authentication module of DSPS maps the user's identity to user account in untrusted DBMS through principal mapping.

DSPS的身份认证模块通过主体映射将用户的身份映射为不可信DBMS的账号。

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Malin is the principal investigator for the camera onboard Mars Global Surveyor, currently in its fifth month of mapping the red planet.

CNN: Scientists debate implications of Mars pictures