Thursday, January 7, 2021

QuickAlerts - Technical Critical Update for Modernized e-File (MeF) System

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QuickAlerts for Tax Professionals January 7, 2021 

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Subject:  Critical Update for Modernized e-File (MeF) System


The MeF system has tightened cryptographic requirements to conform to government-wide guidance and upgrade from digests using the SHA-1 algorithm in digital and XML signatures.  As a result, MeF Production and Assurance Testing System (ATS) environments no longer accept signature and digest methods using SHA-1. An error will be generated if SHA-1 is used, therefore you must switch to SHA-256 or higher.

Additional information can be found on the MeF Status page on IRS.gov.

We apologize for any inconvenience this change may cause.

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