diff --git a/nucypher/characters/lawful.py b/nucypher/characters/lawful.py
index 13ecd177a..ba0178941 100644
--- a/nucypher/characters/lawful.py
+++ b/nucypher/characters/lawful.py
@@ -52,7 +52,6 @@ from cryptography.x509 import Certificate, NameOID, load_pem_x509_certificate
 from eth_typing.evm import ChecksumAddress
 from eth_utils import to_checksum_address
 from flask import Response, request
-from nucypher.crypto.api import encrypt_and_sign, keccak_digest
 from twisted.internet import reactor, stdio, threads
 from twisted.internet.defer import Deferred
 from twisted.internet.task import LoopingCall
diff --git a/nucypher/crypto/keypairs.py b/nucypher/crypto/keypairs.py
index 008b0e714..a8a14b7c5 100644
--- a/nucypher/crypto/keypairs.py
+++ b/nucypher/crypto/keypairs.py
@@ -25,7 +25,6 @@ from constant_sorrow import constants
 from cryptography.hazmat.primitives.asymmetric import ec
 from hendrix.deploy.tls import HendrixDeployTLS
 from hendrix.facilities.services import ExistingKeyTLSContextFactory
-from nucypher.crypto.api import _TLS_CURVE
 from umbral.signing import Signer
 
 from nucypher.config.constants import MAX_UPLOAD_CONTENT_LENGTH
diff --git a/nucypher/network/server.py b/nucypher/network/server.py
index 4df32ae39..d5c17b48f 100644
--- a/nucypher/network/server.py
+++ b/nucypher/network/server.py
@@ -36,7 +36,6 @@ from nucypher.crypto.keypairs import HostingKeypair, DecryptingKeypair
 from nucypher.crypto.kits import PolicyMessageKit
 from nucypher.crypto.powers import KeyPairBasedPower, PowerUpError
 from nucypher.crypto.signing import InvalidSignature
-from nucypher.crypto.tls import InvalidNodeCertificate
 from nucypher.datastore.datastore import Datastore, RecordNotFound
 from nucypher.datastore.models import TreasureMap as TreasureMapModel
 from nucypher.datastore.models import Workorder as WorkOrderModel
@@ -401,9 +400,6 @@ def _make_rest_app(datastore: Datastore, this_node, domain: str, log: Logger) ->
             except NodeSeemsToBeDown:
                 return Response({'error': 'Unreachable node'}, status=400)  # ... toasted
 
-            except InvalidNodeCertificate:
-                return Response({'error': 'Invalid TLS certificate - missing checksum address'}, status=400)  # ... invalid
-
             # Compare the results of the outer POST with the inner GET... yum
             if requesting_ursula_bytes == request.data:
                 return Response(status=200)
diff --git a/nucypher/policy/maps.py b/nucypher/policy/maps.py
index 90235155a..65b06b77b 100644
--- a/nucypher/policy/maps.py
+++ b/nucypher/policy/maps.py
@@ -31,13 +31,13 @@ from eth_utils.address import to_checksum_address, to_canonical_address
 
 from nucypher.blockchain.eth.constants import ETH_ADDRESS_BYTE_LENGTH
 from nucypher.characters.base import Character
-from nucypher.crypto.api import encrypt_and_sign, keccak_digest, verify_eip_191
 from nucypher.crypto.constants import HRAC_LENGTH, WRIT_CHECKSUM_SIZE, EIP712_MESSAGE_SIGNATURE_SIZE
 from nucypher.crypto.kits import UmbralMessageKit
 from nucypher.crypto.powers import DecryptingPower, SigningPower
 from nucypher.crypto.signing import SignatureStamp
 from nucypher.crypto.splitters import signature_splitter
 from nucypher.crypto.umbral_adapter import KeyFrag, PublicKey, Signature
+from nucypher.crypto.utils import keccak_digest, encrypt_and_sign, verify_eip_191
 from nucypher.network.middleware import RestMiddleware
 
 
diff --git a/nucypher/policy/policies.py b/nucypher/policy/policies.py
index 165c18b27..a10e18075 100644
--- a/nucypher/policy/policies.py
+++ b/nucypher/policy/policies.py
@@ -23,12 +23,10 @@ from typing import Tuple, Sequence, Optional, Iterable, List, Dict, Type
 import maya
 from bytestring_splitter import BytestringSplitter, VariableLengthBytestring
 from eth_typing.evm import ChecksumAddress
-from nucypher.crypto.api import keccak_digest
 from twisted.internet import reactor
 
 from nucypher.blockchain.eth.agents import StakersReservoir, StakingEscrowAgent
 from nucypher.blockchain.eth.constants import POLICY_ID_LENGTH
-from nucypher.characters.lawful import Alice, Ursula
 from nucypher.crypto.constants import HRAC_LENGTH
 from nucypher.crypto.kits import RevocationKit
 from nucypher.crypto.powers import TransactingPower
diff --git a/tests/integration/characters/test_federated_grant_and_revoke.py b/tests/integration/characters/test_federated_grant_and_revoke.py
index 893eed794..2ef62fe39 100644
--- a/tests/integration/characters/test_federated_grant_and_revoke.py
+++ b/tests/integration/characters/test_federated_grant_and_revoke.py
@@ -20,11 +20,9 @@ import datetime
 
 import maya
 import pytest
-from nucypher.crypto.api import keccak_digest
 
 from nucypher.characters.lawful import Enrico
 from nucypher.crypto.utils import keccak_digest
-from nucypher.policy.collections import Revocation
 from nucypher.policy.orders import Revocation