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    <p>Here is how you can authenticate using objective c. If you need it in another language should be trivial to translate. </p> <pre><code>-(void)authenticate { __weak GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer]; localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) { if(viewController) { [[[UIApplication sharedApplication] keyWindow].rootViewController presentViewController:viewController animated:YES completion:nil]; } else if(localPlayer.isAuthenticated == YES) { [localPlayer generateIdentityVerificationSignatureWithCompletionHandler:^(NSURL *publicKeyUrl, NSData *signature, NSData *salt, uint64_t timestamp, NSError *error) { if(error != nil) { return; //some sort of error, can't authenticate right now } [self verifyPlayer:localPlayer.playerID publicKeyUrl:publicKeyUrl signature:signature salt:salt timestamp:timestamp]; }]; } else { NSLog(@"game center disabled"); } }; } -(void)verifyPlayer:(NSString *)playerID publicKeyUrl:(NSURL *)publicKeyUrl signature:(NSData *)signature salt:(NSData *)salt timestamp:(uint64_t)timestamp { //get certificate NSData *certificateData = [NSData dataWithContentsOfURL:publicKeyUrl]; //build payload NSMutableData *payload = [[NSMutableData alloc] init]; [payload appendData:[playerID dataUsingEncoding:NSASCIIStringEncoding]]; [payload appendData:[[[NSBundle mainBundle] bundleIdentifier] dataUsingEncoding:NSASCIIStringEncoding]]; uint64_t timestampBE = CFSwapInt64HostToBig(timestamp); [payload appendBytes:&amp;timestampBE length:sizeof(timestampBE)]; [payload appendData:salt]; //sign SecCertificateRef certificateFromFile = SecCertificateCreateWithData(NULL, (__bridge CFDataRef)certificateData); // load the certificate SecPolicyRef secPolicy = SecPolicyCreateBasicX509(); SecTrustRef trust; OSStatus statusTrust = SecTrustCreateWithCertificates( certificateFromFile, secPolicy, &amp;trust); if(statusTrust != errSecSuccess) { NSLog(@"could not create trust"); return; } SecTrustResultType resultType; OSStatus statusTrustEval = SecTrustEvaluate(trust, &amp;resultType); if(statusTrustEval != errSecSuccess) { NSLog(@"could not evaluate trust"); return; } if(resultType != kSecTrustResultProceed &amp;&amp; resultType != kSecTrustResultRecoverableTrustFailure) { NSLog(@"server can not be trusted"); return; } SecKeyRef publicKey = SecTrustCopyPublicKey(trust); uint8_t sha256HashDigest[CC_SHA256_DIGEST_LENGTH]; CC_SHA256([payload bytes], (CC_LONG)[payload length], sha256HashDigest); //check to see if its a match OSStatus verficationResult = SecKeyRawVerify(publicKey, kSecPaddingPKCS1SHA256, sha256HashDigest, CC_SHA256_DIGEST_LENGTH, (const uint8_t *)[signature bytes], [signature length]); CFRelease(publicKey); CFRelease(trust); CFRelease(secPolicy); CFRelease(certificateFromFile); if (verficationResult == errSecSuccess) { NSLog(@"Verified"); } else { NSLog(@"Danger!!!"); } } </code></pre> <p><strong>EDIT:</strong></p> <p>as of March 2nd 2015, apple now uses SHA256 instead of SHA1 on the certificate. <a href="https://devforums.apple.com/thread/263789?tstart=0" rel="nofollow">https://devforums.apple.com/thread/263789?tstart=0</a></p>
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    1. POHow to authenticate the GKLocalPlayer on my 'third party server'?
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    1. POHow to authenticate the GKLocalPlayer on my 'third party server'?
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    1. COAs I understand the logic of such verification function 'verifyPlayer' should be implemented at my server-side. Am I right? So at actual game verifyPlayer() callback will transmit data to the server, which one will check the signature using OpenSSL or other library because there is no iOS APIs.
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    2. COCorrect you should implement this verifyPlayer server side. I just showed how it works using iOS code, but your server needs to do the same sort of steps outlined above to correctly verify.
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