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moduli(5)
NAME
moduli -- system moduli file
DESCRIPTION
The moduli file contains the system-wide Diffie-Hellman prime moduli for
the photurisd(8) and sshd(8) programs.
Each line in this file contains the following fields: Time, Type, Tests,
Tries, Size, Generator, and Modulus. The fields are separated by white
space (tab or blank).
Time (yyyymmddhhmmss)
Specifies the system time that the line was appended to the file.
The value 00000000000000 means unknown (historic).
Type (decimal)
Specifies the internal structure of the prime modulus.
0 unknown; often learned from peer during protocol opera-
tion, and saved for later analysis.
1 unstructured; a common large number.
2 safe (p = 2q + 1); meets basic structural requirements.
3 Schnorr.
4 Sophie-Germaine (q = (p-1)/2); usually generated in the
process of testing safe or strong primes.
5 strong; useful for RSA public key generation.
Tests (decimal) (bit field)
Specifies the methods used in checking for primality. Usually,
more than one test is used.
0 not tested; often learned from peer during protocol oper-
ation, and saved for later analysis.
1 composite; failed one or more tests. In this case, the
highest bit specifies the test that failed.
2 sieve; checked for division by a range of smaller primes.
4 Miller-Rabin.
8 Jacobi.
16 Elliptic Curve.
Tries (decimal)
Depends on the value of the highest valid Test bit, where the
method specified is:
0 not tested (always zero).
1 composite (irrelevant).
2 sieve; number of primes sieved. Commonly on the order of
32,000,000.
4 Miller-Rabin; number of M-R iterations. Commonly on the
order of 32 to 64.
8 Jacobi; unknown (always zero).
16 Elliptic Curve; unused (always zero).
Size (decimal)
Specifies the number of significant bits.
Generator (hex string)
should be weighted toward newer moduli, without completely disqualifying
older moduli.
FILES
/etc/ssh/moduli
SEE ALSO
photurisd(8), sshd(8)
FreeBSD 5.4 July 28, 1997 FreeBSD 5.4
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