SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C.

                                   FORM 12B-25


                                                     Commission File No. 0-27742

                           NOTIFICATION OF LATE FILING


      [ ] Form 10-K    [ ] Form 11-K    [ ] Form 20-F    [X] Form 10-Q


For the quarterly period ended: September 27, 1998

Nothing  in this  form  shall be  construed  to imply  that the  commission  has
verified any information contained herein.

If the notification  relates to a portion of the filing checked above,  identify
the item(s) to which the notification relates: Entire report on Form 10-Q

                                     PART I
                             REGISTRANT INFORMATION

Full name of registrant:  Cylink Corporation

Address of principal executive office (street and number):  910 Hermosa Court

City, state and zip code:  Sunnyvale, California  94086

                                     PART II
                             RULE 12b-25 (b) and (c)

         If the subject report could not be filed without unreasonable effort or
expense and the registrant  seeks relief pursuant to Rule 12b-25,  the following
should be completed. (Check box if appropriate)

         (a)      The reasons described in reasonable detail in Part III of this
                  form could not be eliminated  without  unreasonable  effort or
                  expense;
[ ]      (b)      The subject  annual  report,  semi-annual  report,  transition
                  report on Form  10-K,  20-F,  11-K or Form  N-SAR,  or portion
                  thereof,  will be filed on or  before  the 15th  calendar  day
                  following the  prescribed  due date; or the subject  quarterly
                  report or transition  report on Form 10-Q, or portion thereof,
                  will be filed on or before the fifth  calendar  day  following
                  the prescribed due date; and
         (c)      The  accountant's  statement or other exhibit required by Rule
                  12b-25(c) has been attached, if applicable.


                                    PART III
                                    NARRATIVE

         State below in reasonable detail the reasons why Form 10-K, 11-K, 20-F,
10-Q,  N-SAR or the transition  report portion thereof could not be filed within
the prescribed time period.

The registrant,  with the assistance of its independent accountants,  is engaged
in a  review  of its  revenue  recognition  practices.  The  preliminary  review
indicates  that  revenue  reported in the first and second  quarters of 1998 was
overstated by approximately $5.0 million and $6.7 million,  respectively,  which
would result in restated revenues of approximately $10.8 million for the quarter
ended March 29, 1998 and $11.3  million  for the  quarter  ended June 28,  1998.
Expected revenue for the quarter ended September 27, 1998 is approximately $12.1
million. The above figures are preliminary  estimates and are subject to further
adjustment upon  completion of the review.  In addition,



substantial  operating  losses are expected to be reported for each of the three
quarters in the period ended September 27, 1998. The revised  financial  results
will be subject to the registrant's annual audit.  Accordingly,  there can be no
assurance that these preliminary revenue estimates will not change or that other
adjustments will not be made in the annual financial audit process.

The above  information  regarding the estimated impact of the restatement of the
company's  financial  results  and third  quarter  revenues  is forward  looking
information within the meaning of Section 21E of the Securities  Exchange Act of
1934, as amended. Actual results could differ materially from those projected in
the forward looking information as a result of a number of factors including the
further  analysis and review of the  company's  contracts,  revenue  recognition
practices,  and other  actions that will be taken as the company  completes  its
internal review and the independent  accountants complete their annual audit for
the year ended December 31, 1998.


                                     PART IV
                                OTHER INFORMATION

(1) Name and telephone number of person to contact regarding this notification:

Robert Fougner                     408                735-5800
(Name)                          (Area Code)      (Telephone Number)

(2) Have all other  periodic  reports  required under Section 13 or 15(d) of the
Securities  Exchange Act of 1934 or Section 30 of the Investment  Company Act of
1940  during  the  preceding  12  months  or for such  shorter  period  that the
registrant was require to file such report(s) been filed? [X] Yes [ ] No

(3) Is it anticipated that any significant  change in results of operations from
the  corresponding  period for the last  fiscal  year will be  reflected  by the
earnings statements to be included in the subject report or portion thereof?
                                                          [X] Yes [ ] No

If so; attach an explanation of the  anticipated  change,  both  narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable estimate
of the results cannot be made.

See comments under PART III above.


                           Cylink Corporation
                           (Name of Registrant as Specified in Charter)

Has  caused  this  notification  to be signed on its  behalf by the  undersigned
thereunto duly authorized.

Date: November 12, 1998    By: /s/  ROBERT B. FOUGNER
                                ----------------------
                                Robert B. Fougner, Secretary and General Counsel