Sign and Verify Using Public/Private Keys

sign_verify.sh

# generate private key
openssl genrsa -out private_key.pem 4096

# extract public key 
openssl rsa -in private_key.pem -pubout > public_key.pub

# sign using private key
openssl dgst -sign private_key.pem -keyform PEM -sha256 -out VGG_ILSVRC_16_layers.caffemodel.sign -binary VGG_ILSVRC_16_layers.caffemodel

# extract using public key 
openssl dgst -verify public_key.pub -keyform PEM -sha256 -signature VGG_ILSVRC_16_layers.caffemodel.sign -binary VGG_ILSVRC_16_layers.caffemodel

# tamper with the model
echo "Tamper" >> VGG_ILSVRC_16_layers.caffemodel.tamper

# verify tampered file
openssl dgst -verify public_key.pub -keyform PEM -sha256 -signature VGG_ILSVRC_16_layers.caffemodel.sign -binary VGG_ILSVRC_16_layers.caffemodel.tamper