diff --git a/meta-security/meta-integrity/scripts/ima-gen-CA-signed.sh b/meta-security/meta-integrity/scripts/ima-gen-CA-signed.sh
index 5f3a728..b10b1ba 100755
--- a/meta-security/meta-integrity/scripts/ima-gen-CA-signed.sh
+++ b/meta-security/meta-integrity/scripts/ima-gen-CA-signed.sh
@@ -20,7 +20,6 @@
 
 cat << __EOF__ >$GENKEY
 [ req ]
-default_bits = 1024
 distinguished_name = req_distinguished_name
 prompt = no
 string_mask = utf8only
@@ -36,13 +35,15 @@
 #basicConstraints=CA:FALSE
 keyUsage=digitalSignature
 #keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+extendedKeyUsage=critical,codeSigning
 subjectKeyIdentifier=hash
 authorityKeyIdentifier=keyid
 #authorityKeyIdentifier=keyid,issuer
 __EOF__
 
-openssl req -new -nodes -utf8 -sha1 -days 365 -batch -config $GENKEY \
-        -out csr_ima.pem -keyout privkey_ima.pem
-openssl x509 -req -in csr_ima.pem -days 365 -extfile $GENKEY -extensions v3_usr \
+openssl req -new -nodes -utf8 -sha256 -days 36500 -batch -config $GENKEY \
+        -out csr_ima.pem -keyout privkey_ima.pem \
+        -newkey ec -pkeyopt ec_paramgen_curve:prime256v1
+openssl x509 -req -in csr_ima.pem -days 36500 -extfile $GENKEY -extensions v3_usr \
         -CA $CA -CAkey $CAKEY -CAcreateserial \
         -outform DER -out x509_ima.der
diff --git a/meta-security/meta-integrity/scripts/ima-gen-local-ca.sh b/meta-security/meta-integrity/scripts/ima-gen-local-ca.sh
index b600761..339d3e3 100755
--- a/meta-security/meta-integrity/scripts/ima-gen-local-ca.sh
+++ b/meta-security/meta-integrity/scripts/ima-gen-local-ca.sh
@@ -18,7 +18,6 @@
 
 cat << __EOF__ >$GENKEY
 [ req ]
-default_bits = 2048
 distinguished_name = req_distinguished_name
 prompt = no
 string_mask = utf8only
@@ -33,10 +32,11 @@
 basicConstraints=CA:TRUE
 subjectKeyIdentifier=hash
 authorityKeyIdentifier=keyid:always,issuer
-# keyUsage = cRLSign, keyCertSign
+keyUsage = cRLSign, keyCertSign
 __EOF__
 
-openssl req -new -x509 -utf8 -sha1 -days 3650 -batch -config $GENKEY \
+openssl req -new -x509 -utf8 -sha256 -days 36500 -batch -config $GENKEY \
+        -newkey ec -pkeyopt ec_paramgen_curve:prime256v1 \
         -outform DER -out ima-local-ca.x509 -keyout ima-local-ca.priv
 
 openssl x509 -inform DER -in ima-local-ca.x509 -out ima-local-ca.pem
diff --git a/meta-security/meta-integrity/scripts/ima-gen-self-signed.sh b/meta-security/meta-integrity/scripts/ima-gen-self-signed.sh
deleted file mode 100755
index 5ee876c..0000000
--- a/meta-security/meta-integrity/scripts/ima-gen-self-signed.sh
+++ /dev/null
@@ -1,41 +0,0 @@
-#!/bin/sh
-#
-# Copied from ima-evm-utils.
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# version 2 as published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-GENKEY=ima.genkey
-
-cat << __EOF__ >$GENKEY
-[ req ]
-default_bits = 1024
-distinguished_name = req_distinguished_name
-prompt = no
-string_mask = utf8only
-x509_extensions = myexts
-
-[ req_distinguished_name ]
-O = example.com
-CN = meta-intel-iot-security example signing key
-emailAddress = john.doe@example.com
-
-[ myexts ]
-basicConstraints=critical,CA:FALSE
-keyUsage=digitalSignature
-subjectKeyIdentifier=hash
-authorityKeyIdentifier=keyid
-__EOF__
-
-openssl req -new -nodes -utf8 -sha1 -days 36500 -batch \
-        -x509 -config $GENKEY \
-	-outform DER -out x509_ima.der -keyout privkey_ima.pem