Beta 0.9.0
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o Added private key crypto interface.  Utilizes a session key generated
  by a cryptographically strong psuedo-random number generator run at
  both ends and a session key exchange protocol that is resistant to
  replay attacks.

o Added BLOWFISH cipher.

o Added IDEA cipher.

o Added 3DES cipher.


Alpha 0.3.2
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o Fixed comm.c so that Nautilus issues a "ATD" command to the modem
  in the absence of a phone number.  "ATO" doesn't pick up the phone
  line and thus doesn't work.

o Changed sun-dmsp.c and idmsp.c to optimize coder performance.
  Obtained approximately 0.3 dB boost in SNR and 0.27 dB boost in
  SNRSEG.


Alpha 0.3.1
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o Changed comm.c to allow user to specify -o (originate) without
  specifying a phone number.  This causes the Nautilus to issue a "ATO"
  command to the modem to put it in originate mode.

o Changed beep frequency from 500HZ to 750HZ and duration from 100ms
  to 80ms.


Alpha 0.3.0
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o Added coder negotiation code to allow Nautilus to automatically
  select the best coder to use based on the CPU and bandwidth limitations
  of both ends.  Added code to allow users to override the automatically
  selected coder if desired.  Modified init.c, nautilus.h, comm.c,
  cli.c, unix.c, and pc-audio.c
