Password Protection

• Unix system (user ID, cipher text password, plain text salt)

  • password 8 printable characters - 56-bit value (7-bit ASCII)
  • encryption routine (crypt(3)) based on DES
  • modified DES algorithm with 12-bit salt value (related to time of password assignment)
  • 25 encryptions with 64-bit block of zeros input
  • 64-bit - 11 character sequence