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Hi, eskimo,Thanks for your reply.Yes, the eclipse curve private key is in the Secure Enclave.I query the SecKeyRef from the keychain (at line #11) and then use it to create the signature almost immediately (call signature at line #18). NSDictionary *query = @{ (__bridge id)kSecClass: (__bridge id)kSecClassKey, (__bridge id)kSecAttrKeyClass: (__bridge id)kSecAttrKeyClassPrivate, (__bridge id)kSecAttrLabel: index, (__bridge id)kSecReturnRef: @YES, (__bridge id)kSecUseOperationPrompt: promptStr }; // Retrieve the key from the keychain. SecKeyRef privateKey; OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, (CFTypeRef *)&privateKey); NSData* dataToReturn = nil; if (status == errSecSuccess) { *errorCodeBack = NO_ERROR; dataToReturn = [self signature:inputData withKey:privateKey err:errorCodeBack]; CFRelease(privateKey); }And the NSInternalInconsistencyException happened at line #4 when calling SecKeyCreateSignature.-(NSData*)signature:(NSData*)plainData withKey:(SecKeyRef)privateKey err:(UAF_ErrorCode*)errorCodeBack { NSError *error; NSData *signature = CFBridgingRelease(SecKeyCreateSignature(privateKey, kSecKeyAlgorithmECDSASignatureMessageX962SHA256, (CFDataRef)plainData, (void *)&error)); if (error) { //some error handling code... return nil; } return signature; } I review the latest crash log again, there are also 13.4.x users now (13.1.x - 13.4.x).All the crashes are on 13.x for now.I'll try to collect more information and file a bug about this.Many thanks.