  We present X-ray spectral analyses of the three z>4 Active Galactic Nuclei
(AGNs) thus far spectroscopically identified in the Chandra Deep Field-North
Survey, at redshifts of 5.186, 4.424, and 4.137. These analyses are made
possible by the extremely deep exposure (2 Ms) and the low Chandra background.
The rest-frame 2.5-40 keV spectra are the first for optically faint (two of the
three sources have I>24) z>4 AGNs. The z=5.186 quasar is well fitted by a
power-law model with photon index Gamma=1.8+/-0.3, consistent with those of
lower-redshift, unobscured AGNs. The other two AGNs have flatter effective
X-ray photon indices (Gamma approx 1.1-1.5), suggesting the presence of
intrinsic absorption (provided their underlying X-ray continua are similar to
those of lower-redshift AGNs). It is possible that the flat X-ray continuum of
the z=4.424 AGN is partially related to its radio loudness. If the z=4.137 AGN
suffers from X-ray absorption, the implied column density is N_H=2x10^23 cm^-2.
