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X9 TG-24-1999
- Technical Guideline: Managing Risk and Migration Planning: Withdrawal of ANSI X9.9, Financial Institution Message Authentication Codes (MAC) Wholesale
- standard by Accredited Standards Committee X9 Incorporated, 07/01/1999
- Publisher: X9
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Based on certain attacks on 56 bit DES described in detail in Section 6, it is theconsensus of X9 that Message Authentication Codes (MACs) as defined in ANSI X9.9-1994 no longer provide sufficient security to protect wholesale financial transactions.Hence, X9.9 is being withdrawn.This Guideline discusses:
- using new technology to provide integrity protection for wholesale financialmessages,
- transitioning from X9.9 to the new technology, and
- measures can be taken to ameliorate the risk inherent in X9.9 during the transitionperiod.
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