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+MODULI(5)                 OpenBSD Programmer's Manual                MODULI(5)
+
+NAME
+     moduli - Diffie Hellman moduli
+
+DESCRIPTION
+     The /etc/moduli file contains prime numbers and generators for use by
+     sshd(8) in the Diffie-Hellman Group Exchange key exchange method.
+
+     New moduli may be generated with ssh-keygen(1) using a two-step process.
+     An initial candidate generation pass, using ssh-keygen -G, calculates
+     numbers that are likely to be useful.  A second primality testing pass,
+     using ssh-keygen -T provides a high degree of assurance that the numbers
+     are prime and are safe for use in Diffie Hellman operations by sshd(8).
+     This moduli format is used as the output from each pass.
+
+     The file consists of newline-separated records, one per modulus, contain-
+     ing seven space separated fields.  These fields are as follows:
+
+           timestamp    The time that the modulus was last processed as YYYYM-
+                        MDDHHMMSS.
+
+           type         Decimal number specifying the internal structure of
+                        the prime modulus.  Supported types are:
+
+                        0     Unknown, not tested
+                        2     "Safe" prime; (p-1)/2 is also prime.
+                        4     Sophie Germain; (p+1)*2 is also prime.
+
+                        Moduli candidates initially produced by ssh-keygen(1)
+                        are Sophie Germain primes (type 4).  Futher primality
+                        testing with ssh-keygen(1) produces safe prime moduli
+                        (type 2) that are ready for use in sshd(8).  Other
+                        types are not used by OpenSSH.
+
+           tests        Decimal number indicating the type of primality tests
+                        that the number has been subjected to represented as a
+                        bitmask of the following values:
+
+                        0x00  Not tested
+                        0x01  Composite number - not prime.
+                        0x02  Sieve of Eratosthenes
+                        0x04  Probabalistic Miller-Rabin primality tests.
+
+                        The ssh-keygen(1) moduli candidate generation uses the
+                        Sieve of Eratosthenes (flag 0x02).  Subsequent
+                        ssh-keygen(1) primality tests are Miller-Rabin tests
+                        (flag 0x04).
+
+           trials       Decimal number indicating of primaility trials that
+                        have been performed on the modulus.
+
+           size         Decimal number indicating the size of the prime in
+                        bits.
+
+           generator    The recommended generator for use with this modulus
+                        (hexadecimal).
+
+           modulus      The modulus itself in hexadecimal.
+
+     When performing Diffie Hellman Group Exchange, sshd(8) first estimates
+     the size of the modulus required to produce enough Diffie Hellman output
+     to sufficiently key the selected symmetric cipher.  sshd(8) then randomly
+     selects a modulus from /etc/moduli that best meets the size requirement.
+
+SEE ALSO
+     ssh-keygen(1), sshd(8),
+
+     Diffie-Hellman Group Exchange for the Secure Shell (SSH) Transport Layer
+     Protocol, RFC 4419, 2006.
+
+OpenBSD 4.5                      June 26, 2008                               2