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diff --git a/pyasn1_modules/rfc7894.py b/pyasn1_modules/rfc7894.py
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+++ b/pyasn1_modules/rfc7894.py
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+#
+# This file is part of pyasn1-modules software.
+#
+# Created by Russ Housley.
+#
+# Copyright (c) 2019, Vigil Security, LLC
+# License: http://snmplabs.com/pyasn1/license.html
+#
+# Alternative Challenge Password Attributes for EST
+#
+# ASN.1 source from:
+# https://www.rfc-editor.org/rfc/rfc7894.txt
+#
+
+from pyasn1.type import char
+from pyasn1.type import constraint
+from pyasn1.type import namedtype
+from pyasn1.type import univ
+
+from pyasn1_modules import rfc5652
+from pyasn1_modules import rfc6402
+from pyasn1_modules import rfc7191
+
+
+# SingleAttribute is the same as Attribute in RFC 5652, except that the
+# attrValues SET must have one and only one member
+
+Attribute = rfc7191.SingleAttribute
+
+
+# DirectoryString is the same as RFC 5280, except the length is limited to 255
+
+class DirectoryString(univ.Choice):
+    pass
+
+DirectoryString.componentType = namedtype.NamedTypes(
+    namedtype.NamedType('teletexString', char.TeletexString().subtype(
+        subtypeSpec=constraint.ValueSizeConstraint(1, 255))),
+    namedtype.NamedType('printableString', char.PrintableString().subtype(
+        subtypeSpec=constraint.ValueSizeConstraint(1, 255))),
+    namedtype.NamedType('universalString', char.UniversalString().subtype(
+        subtypeSpec=constraint.ValueSizeConstraint(1, 255))),
+    namedtype.NamedType('utf8String', char.UTF8String().subtype(
+        subtypeSpec=constraint.ValueSizeConstraint(1, 255))),
+    namedtype.NamedType('bmpString', char.BMPString().subtype(
+        subtypeSpec=constraint.ValueSizeConstraint(1, 255)))
+)
+
+
+# OTP Challenge Attribute
+
+id_aa_otpChallenge = univ.ObjectIdentifier('1.2.840.113549.1.9.16.2.56')
+
+ub_aa_otpChallenge = univ.Integer(255)
+
+otpChallenge = Attribute()
+otpChallenge['attrType'] = id_aa_otpChallenge
+otpChallenge['attrValues'][0] = DirectoryString()
+
+
+# Revocation Challenge Attribute
+
+id_aa_revocationChallenge = univ.ObjectIdentifier('1.2.840.113549.1.9.16.2.57')
+
+ub_aa_revocationChallenge = univ.Integer(255)
+
+revocationChallenge = Attribute()
+revocationChallenge['attrType'] = id_aa_revocationChallenge
+revocationChallenge['attrValues'][0] = DirectoryString()
+
+
+#  EST Identity Linking Attribute
+
+id_aa_estIdentityLinking = univ.ObjectIdentifier('1.2.840.113549.1.9.16.2.58')
+
+ub_aa_est_identity_linking = univ.Integer(255)
+
+estIdentityLinking = Attribute()
+estIdentityLinking['attrType'] = id_aa_estIdentityLinking
+estIdentityLinking['attrValues'][0] = DirectoryString()
+
+
+# Map of Attribute Type OIDs to Attributes added to the
+# ones that are in rfc6402.py
+
+_cmcControlAttributesMapUpdate = {
+    id_aa_otpChallenge: DirectoryString(),
+    id_aa_revocationChallenge: DirectoryString(),
+    id_aa_estIdentityLinking: DirectoryString(),
+}
+
+rfc6402.cmcControlAttributesMap.update(_cmcControlAttributesMapUpdate)