diff --git a/modules/certauth.cpp b/modules/certauth.cpp
index 850973dd..13fb934c 100644
--- a/modules/certauth.cpp
+++ b/modules/certauth.cpp
@@ -60,7 +60,7 @@ public:
 
 			it1->second.Split(" ", vsKeys, false);
 			for (it2 = vsKeys.begin(); it2 != vsKeys.end(); ++it2) {
-				m_PubKeys[it1->first].insert(*it2);
+				m_PubKeys[it1->first].insert(it2->AsLower());
 			}
 		}
 
@@ -96,7 +96,7 @@ public:
 	}
 
 	bool AddKey(CUser *pUser, CString sKey) {
-		pair<SCString::iterator, bool> pair = m_PubKeys[pUser->GetUserName()].insert(sKey);
+		pair<SCString::iterator, bool> pair = m_PubKeys[pUser->GetUserName()].insert(sKey.AsLower());
 
 		if (pair.second) {
 			Save();
@@ -235,7 +235,7 @@ public:
 		case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 		case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 		case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
-			return sRes;
+			return sRes.AsLower();
 		default:
 			return "";
 		}