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moduli (5)
  • >> moduli (5) ( FreeBSD man: Форматы файлов )
  • moduli (5) ( Linux man: Форматы файлов )

  • BSD mandoc
     

    NAME

    
    
    moduli
    
     - system moduli file
    
     
    

    DESCRIPTION

    The 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 (Vt yyyymmddhhmmss )
    Specifies the system time that the line was appended to the file. The value 00000000000000 means unknown (historic).
    Type (Vt decimal )
    Specifies the internal structure of the prime modulus.

    0
    unknown; often learned from peer during protocol operation, 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 (Vt 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 operation, 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 (Vt 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 (Vt decimal )
    Specifies the number of significant bits.
    Generator (Vt hex string )
    Specifies the best generator for a Diffie-Hellman exchange. 0 = unknown or variable, 2, 3, 5, etc.
    Modulus (Vt hex string )
    The prime modulus.

    The file is searched for moduli that meet the appropriate Time , Size and Generator criteria. When more than one meet the criteria, the selection should be weighted toward newer moduli, without completely disqualifying older moduli.  

    FILES

    /etc/ssh/moduli

     

    SEE ALSO

    photurisd(8), sshd(8)


     

    Index

    NAME
    DESCRIPTION
    FILES
    SEE ALSO


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