SCIENCE DYNAMICS CORPORATION AND CERTAIN OF ITS SUBSIDIARIES
                            MASTER SECURITY AGREEMENT



To:      Laurus Master Fund, Ltd.
         c/o M&C Corporate Services Limited
         P.O. Box 309 GT
         Ugland House
         South Church Street
         George Town
Grand Cayman, Cayman Islands

Date: February 11, 2005

To Whom It May Concern:

     1. To secure the payment of all Obligations (as hereafter defined), SCIENCE
DYNAMICS CORPORATION, a Delaware corporation (the "Company"),  each of the other
undersigned  parties  (other than Laurus  Master Fund,  Ltd,  "Laurus") and each
other entity that is required to enter into this Master Security Agreement (each
an "Assignor" and,  collectively,  the "Assignors") hereby assigns and grants to
Laurus a continuing security interest in all of the following property now owned
or at any time hereafter acquired by any Assignor,  or in which any Assignor now
have or at any time in the future may acquire any right,  title or interest (the
"Collateral"):  all  cash,  cash  equivalents,  accounts,  accounts  receivable,
deposit  accounts  ,  inventory,   equipment,   goods,  documents,   instruments
(including,  without  limitation,  promissory notes),  contract rights,  general
intangibles (including,  without limitation, payment intangibles and an absolute
right to license on terms no less  favorable  than those current in effect among
our affiliates),  chattel paper,  supporting  obligations,  investment  property
(including,  without  limitation,  all equity  interests owned by any Assignor),
letter-of-credit  rights,  trademarks,   trademark  applications,   tradestyles,
patents,  patent  applications,  copyrights,  copyright  applications  and other
intellectual  property in which any Assignor  now have or hereafter  may acquire
any right,  title or interest,  all proceeds  and products  thereof  (including,
without  limitation,  proceeds of insurance) and all  additions,  accessions and
substitutions thereto or therefore.  In the event any Assignor wishes to finance
the  acquisition  in the ordinary  course of business of any hereafter  acquired
equipment and have obtained a commitment from a financing source to finance such
equipment from an unrelated  third party,  Laurus agrees to release its security
interest on such  hereafter  acquired  equipment so financed by such third party
financing source. Except as otherwise defined herein, all capitalized terms used
herein shall have the meaning  provided  such terms in the  Securities  Purchase
Agreement referred to below.

     2. The term  "Obligations" as used herein shall mean and include all debts,
liabilities and obligations  owing by each Assignor to Laurus arising under, out
of, or in connection with: (i) that certain Securities  Purchase Agreement dated
as of the date hereof by and  between  the  Company and Laurus (the  "Securities
Purchase  Agreement")  and  (ii)  the  Related  Agreements  referred  to in  the
Securities  Purchase  Agreement  (the  Securities  Purchase  Agreement  and each




Related Agreement,  as each may be amended,  modified,  restated or supplemented
from time to time, are collectively referred to herein as the "Documents"),  and
in connection  with any  documents,  instruments  or  agreements  relating to or
executed in  connection  with the  Documents or any  documents,  instruments  or
agreements  referred to therein or otherwise,  and in connection  with any other
indebtedness,  obligations or liabilities of any Assignor to Laurus, whether now
existing or hereafter arising,  direct or indirect,  liquidated or unliquidated,
absolute  or  contingent,  due or not  due and  whether  under,  pursuant  to or
evidenced by a note, agreement, guaranty, instrument or otherwise, in each case,
irrespective of the genuineness,  validity, regularity or enforceability of such
Obligations,  or of any instrument  evidencing any of the  Obligations or of any
collateral  therefor  or of the  existence  or  extent of such  collateral,  and
irrespective of the allowability, allowance or disallowance of any or all of the
Obligations  in any case  commenced by or against any  Assignor  under Title 11,
United States Code, including,  without limitation,  obligations or indebtedness
of each Assignor for post-petition interest,  fees, costs and charges that would
have accrued or been added to the Obligations  but for the  commencement of such
case.

     3. Each  Assignor  hereby  jointly and severally  represents,  warrants and
covenants to Laurus that:

          (a) it is a corporation,  partnership or limited liability company, as
     the case may be, validly existing, in good standing and organized under the
     respective laws of its  jurisdiction of organization  set forth on Schedule
     A, and each  Assignor  will provide  Laurus thirty (30) days' prior written
     notice of any change in any of its respective jurisdiction of organization;

          (b) its legal name is as set forth in its  respective  Certificate  of
     Incorporation or other  organizational  document (as applicable) as amended
     through the date hereof and as set forth on Schedule A, and it will provide
     Laurus  thirty (30) days' prior  written  notice of any change in its legal
     name;

          (c) its organizational identification number (if applicable) is as set
     forth on Schedule A hereto,  and it will provide  Laurus  thirty (30) days'
     prior  written   notice  of  any  change  in  any  of  its   organizational
     identification number;

          (d) it is the lawful owner of the respective Collateral and it has the
     sole  right to grant a  security  interest  therein  and  will  defend  the
     Collateral against all claims and demands of all persons and entities;

          (e) it will  keep its  respective  Collateral  free  and  clear of all
     attachments,  levies,  taxes, liens, security interests and encumbrances of
     every kind and nature  ("Encumbrances"),  except (i) Encumbrances  securing
     the  Obligations  and (ii) to the extent said  Encumbrance  does not secure
     indebtedness  in excess of  $50,000  and such  Encumbrance  is  removed  or
     otherwise released within ten (10) days of the creation thereof;

          (f) it will, at its and the other Assignors joint and several cost and
     expense keep the Collateral in good state of repair (ordinary wear and tear
     excepted)  and will not waste or destroy the same or any part thereof other
     than ordinary course discarding of items no longer used or useful in its or
     such other Assignors' business;

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          (g) it will not without Laurus' prior written consent, sell, exchange,
     lease or otherwise  dispose of the  Collateral,  whether by sale,  lease or
     otherwise,  except  for the sale of  inventory  in the  ordinary  course of
     business  and for the  disposition  or transfer in the  ordinary  course of
     business  during any fiscal  year of obsolete  and  worn-out  equipment  or
     equipment no longer  necessary for its ongoing  needs,  having an aggregate
     fair market value of not more than $25,000 and only to the extent that:

               (i) (x) in respect of each Assignor other than SMEI, the proceeds
          of any such  disposition  are used to acquire  replacement  Collateral
          which  is  subject  to  Laurus'  first  priority   perfected  security
          interest, or are used to repay Obligations or to pay general corporate
          expenses  and (y) in respect of SMEI only,  the  proceeds  of any such
          disposition  are  used to  acquire  replacement  Collateral  which  is
          subject to Laurus' perfected  security  interest,  or shall be used to
          repay Obligations or to pay general corporate expenses; and

               (ii)  following  the  occurrence  of an  Event of  Default  which
          continues  to exist the proceeds of which are remitted to Laurus to be
          held as cash collateral for the Obligations;

          (h) it will  insure or cause the  Collateral  to be insured in Laurus'
     name against loss or damage by fire, theft,  burglary,  pilferage,  loss in
     transit and such other hazards as Laurus shall specify in amounts and under
     policies by insurers acceptable to Laurus and all premiums thereon shall be
     paid by such  Assignor  and the policies  delivered to Laurus.  If any such
     Assignor  fails to do so,  Laurus may procure such  insurance  and the cost
     thereof  shall  be  promptly  reimbursed  by  the  Assignors,  jointly  and
     severally, and shall constitute Obligations;

          (i)  it  will  at  all  reasonable   times  allow  Laurus  or  Laurus'
     representatives  free  access  to  and  the  right  of  inspection  of  the
     Collateral;

          (j) such  Assignor  (jointly and severally  with each other  Assignor)
     hereby indemnifies and saves Laurus harmless from all loss, costs,  damage,
     liability and/or expense, including reasonable attorneys' fees, that Laurus
     may sustain or incur to enforce payment,  performance or fulfillment of any
     of the  Obligations  and/or  in the  enforcement  of this  Master  Security
     Agreement  or in the  prosecution  or defense  of any action or  proceeding
     either against Laurus or any Assignor  concerning any matter growing out of
     or in connection  with this Master  Security  Agreement,  and/or any of the
     Obligations  and/or any of the  Collateral  except to the extent  caused by
     Laurus' own gross  negligence  or willful  misconduct  (as  determined by a
     court of competent jurisdiction in a final and nonappealable decision); and



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     4. The  occurrence  of any of the  following  events  or  conditions  shall
constitute an "Event of Default" under this Master Security Agreement:

          (a)  any  covenant,  warranty,  representation  or  statement  made or
     furnished  to  Laurus  by the  Assignor  or on the  Assignor's  behalf  was
     breached in any material respect or false in any material respect when made
     or  furnished,  as the case may be,  and,  in the  case of a  covenant,  if
     subject to cure, shall not be cured for a period of fifteen (15) days;

          (b)  the  loss,  theft,  substantial  damage,  destruction,   sale  or
     encumbrance  to or of any of the  Collateral  or the  making  of any  levy,
     seizure or attachment thereof or thereon except to the extent:

               (i) such loss is covered by insurance  proceeds which are used to
          replace the item or repay Laurus; or

               (ii)  said   levy,   seizure  or   attachment   does  not  secure
          indebtedness  in  excess  of  $100,000  and  such  levy,   seizure  or
          attachment has been removed or otherwise released within ten (10) days
          of the creation or the assertion thereof;

          (b) any Assignor shall become insolvent,  cease operations,  dissolve,
     terminate our business  existence,  make an  assignment  for the benefit of
     creditors,  suffer the  appointment of a receiver,  trustee,  liquidator or
     custodian of all or any part of Assignors' property;

          (c) any  proceedings  under any  bankruptcy or insolvency law shall be
     commenced by or against any Assignor;

          (d) the Company shall repudiate,  purport to revoke or fail to perform
     any or all of its  obligations  under any Note (after passage of applicable
     cure period, if any); or

          (e) an Event of Default  shall have  occurred  under and as defined in
     any Document.

     5. Upon the occurrence of any Event of Default and at any time  thereafter,
Laurus may declare all Obligations  immediately due and payable and Laurus shall
have the remedies of a secured party provided in the Uniform  Commercial Code as
in effect in the State of New York,  this  Agreement and other  applicable  law.
Upon the occurrence of any Event of Default and at any time  thereafter,  Laurus
will have the right to take  possession of the  Collateral  and to maintain such
possession  on our premises or to remove the  Collateral  or any part thereof to
such other  premises as Laurus may desire.  Upon  Laurus'  request,  each of the
Assignors  shall  assemble or cause the  Collateral  to be assembled and make it
available to Laurus at a place  designated  by Laurus.  If any  notification  of
intended disposition of any Collateral is required by law, such notification, if
mailed,  shall be deemed  properly and  reasonably  given if mailed at least ten
(10) days before such  disposition,  postage prepaid,  addressed to any Assignor
either at such  Assignor's  address shown herein or at any address  appearing on
Laurus' records for such Assignor. Any proceeds of any disposition of any of the

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Collateral  shall be  applied  by  Laurus  to the  payment  of all  expenses  in
connection with the sale of the Collateral, including reasonable attorneys' fees
and other  legal  expenses  and  disbursements  and the  reasonable  expense  of
retaking, holding, preparing for sale, selling, and the like, and any balance of
such proceeds may be applied by Laurus toward the payment of the  Obligations in
such order of application as Laurus may elect, and each Assignor shall be liable
for any  deficiency.  For the avoidance of doubt,  following the  occurrence and
during the  continuance of an Event of Default,  Laurus shall have the immediate
right to withdraw any and all monies  contained  in any deposit  accounts in the
name of the Assignor and controlled by Laurus and apply same to the repayment of
the Obligations (in such order of application as Laurus may elect).

     6. If any Assignor defaults in the performance or fulfillment of any of the
terms,  conditions,  promises,  covenants,  provisions  or  warranties  on  such
Assignor's  part to be performed  or fulfilled  under or pursuant to this Master
Security  Agreement,  Laurus  may,  at its option  without  waiving its right to
enforce this Master Security Agreement according to its terms, immediately or at
any time  thereafter and without notice to any Assignor,  perform or fulfill the
same or cause the  performance or  fulfillment  of the same for each  Assignor's
joint and several  account  and at each  Assignor's  joint and several  cost and
expense, and the cost and expense thereof (including reasonable attorneys' fees)
shall be added to the  Obligations  and shall be payable on demand with interest
thereon at the highest rate permitted by law, or, at Laurus' option,  debited by
Laurus from the any deposit  accounts in the name of the Assignor and controlled
by Laurus.

     7. Each Assignor appoints Laurus, any of Laurus' officers, employees or any
other person or entity whom Laurus may designate as our attorney,  with power to
execute  such  documents  in  each  of our  behalf  and to  supply  any  omitted
information and correct patent errors in any documents  executed by any Assignor
or on any Assignor's  behalf; to file financing  statements  against us covering
the  Collateral  (and,  in  connection  with the  filing  of any such  financing
statements,  describe the  Collateral as "all assets and all personal  property,
whether now owned  and/or  hereafter  acquired"  (or any  substantially  similar
variation  thereof));  to sign our name on public  records;  and to do all other
things Laurus deem necessary to carry out this Master Security  Agreement.  Each
Assignor  hereby  ratifies  and  approves  all acts of the  attorney and neither
Laurus nor the attorney  will be liable for any acts of  commission or omission,
nor for any  error of  judgment  or  mistake  of fact or law  other  than  gross
negligence  or  willful  misconduct  (as  determined  by a  court  of  competent
jurisdiction in a final and non-appealable  decision).  This power being coupled
with an interest, is irrevocable so long as any Obligations remains unpaid.

     8. No delay or failure on Laurus' part in exercising  any right,  privilege
or option  hereunder  shall  operate as a waiver of such or of any other  right,
privilege,  remedy or option,  and no waiver  whatever  shall be valid unless in
writing,  signed by Laurus and then only to the extent therein set forth, and no
waiver by Laurus of any default  shall  operate as a waiver of any other default
or of  the  same  default  on a  future  occasion.  Laurus'  books  and  records
containing  entries  with  respect to the  Obligations  shall be  admissible  in
evidence in any action or  proceeding,  shall be binding upon each  Assignor for
the purpose of  establishing  the items  therein set forth and shall  constitute
prima facie  proof  thereof.  Laurus  shall have the right to enforce any one or
more  of  the  remedies  available  to  Laurus,  successively,   alternately  or
concurrently.  Each Assignor  agrees to join with Laurus in executing  financing
statements or other instruments to the extent required by the Uniform Commercial
Code in form  satisfactory  to Laurus and in executing  such other  documents or
instruments  as may be required or deemed  necessary  by Laurus for  purposes of
affecting or continuing Laurus' security interest in the Collateral.

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     9. This Master  Security  Agreement  shall be governed by and  construed in
accordance  with the laws of the  State of New  York and  cannot  be  terminated
orally. All of the rights, remedies,  options, privileges and elections given to
Laurus  hereunder shall inure to the benefit of Laurus'  successors and assigns.
The term  "Laurus" as herein used shall include  Laurus,  any parent of Laurus',
any of Laurus'  subsidiaries and any co-subsidiaries of Laurus' parent,  whether
now existing or hereafter created or acquired, and all of the terms, conditions,
promises, covenants,  provisions and warranties of this Agreement shall inure to
the  benefit  of each of the  foregoing,  and  shall  bind the  representatives,
successors  and assigns of each  Assignor.  Laurus and each Assignor  hereby (a)
waive  any and all  right  to  trial  by jury  in  litigation  relating  to this
Agreement and the transactions  contemplated hereby and each Assignor agrees not
to assert any  counterclaim in such  litigation,  (b) submit to the nonexclusive
jurisdiction  of any New York State court  sitting in the borough of  Manhattan,
the city of New York and (c) waive any  objection  Laurus or each  Assignor  may
have as to the bringing or maintaining of such action with any such court.

     10. It is  understood  and agreed that any person or entity that desires to
become an Assignor  hereunder,  or is required to execute a counterpart  of this
Master Security  Agreement after the date hereof pursuant to the requirements of
any  Document,  shall become an Assignor  hereunder  by (x)  executing a Joinder
Agreement  in  form  and  substance   satisfactory  to  Laurus,  (y)  delivering
supplements  to such  exhibits  and annexes to such  Documents  as Laurus  shall
reasonably  request and (z) taking all actions as specified in this Agreement as
would have been taken by such  Assignor  had it been an  original  party to this
Agreement,  in each case with all  documents  required  above to be delivered to
Laurus and with all  documents  and  actions  required  above to be taken to the
reasonable satisfaction of Laurus.

     11. All notices from Laurus to any Assignor shall be sufficiently  given if
mailed or delivered to such Assignor's address set forth below.



                                       Very truly yours,



                                       Science Dynamics Corporation



                                       By: ____________________

                                       Name:

                                       Title:

                                       Address: 7150 N. Park Drive, Suite 500,
                                                Pennsauken, NJ 08109



                                       6


                                       M3 Acquisition Corp.



                                       By: ____________________

                                       Name:

                                       Title:

                                       Address: 7150 N. Park Drive, Suite 500,
                                       Pennsauken, NJ 08109




                                       SciDyn   Corp.



                                       By: ____________________

                                       Name:

                                       Title:

                                       Address: 7150 N. Park Drive, Suite 500,
                                        Pennsauken, NJ 08109









                                       ACKNOWLEDGED:



                                       LAURUS MASTER FUND, LTD.



                                       By:______________________

                                       Name:

                                       Title




                                       7





        --------------------------- ------------------------------------
                                   SCHEDULE A

                                     Entity
                          Jurisdiction of Organization
                       Organization Identification Number

                          Science Dynamics Corporation

                                    Delaware
                                   22-2011859

                              M3 Acquisition Corp.

                                   New Jersey
                                    470914450

                                  SciDyn Corp.

                                   New Jersey
                                    050582862


















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