security: In SelfVerifyPolicyManager, fix typo in comment.
diff --git a/src/security/policy/self-verify-policy-manager.cpp b/src/security/policy/self-verify-policy-manager.cpp
index 778f612..025514c 100644
--- a/src/security/policy/self-verify-policy-manager.cpp
+++ b/src/security/policy/self-verify-policy-manager.cpp
@@ -81,7 +81,7 @@
 SelfVerifyPolicyManager::checkVerificationPolicy
   (const shared_ptr<Data>& data, int stepCount, const OnVerified& onVerified, const OnVerifyFailed& onVerifyFailed)
 { 
-  // Case to const Data* so that we use the const version of getSignature() and don't reset the default encoding.
+  // Cast to const Data* so that we use the const version of getSignature() and don't reset the default encoding.
   const Sha256WithRsaSignature *signature = dynamic_cast<const Sha256WithRsaSignature*>(((const Data*)data.get())->getSignature());
   if (!signature)
     throw SecurityException("SelfVerifyPolicyManager: Signature is not Sha256WithRsaSignature.");