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I have got a decryption/encryption method using CCCrypt() which worked really well on iOS5. Now I am working with the iOS6 SDK and never changed my code, but it seems that something is broken. I can still encrypt a string with a key and decrypt it, but if I use another key to decrypt the same string, the CCCryptStatus coming back from CCCrypt() is still 0(kCCSuccess) - even when the decryption fails, because after that my NSData isn't filled. On iOS5 I got the error message -4303 which I could handle then. Any ideas what can be wrong now? My Code: char keyPtr[kCCKeySizeAES256+1]; bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // fetch key data [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; if (encryptOrDecrypt == kCCDecrypt) { data = [GTMBase64 decodeData:data]; } NSUInteger dataLength = [data length]; size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(encryptOrDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, NULL , [data bytes], dataLength, buffer, bufferSize, &numBytesDecrypted); if (cryptStatus != kCCSuccess){ // do something, but cryptStatus is always 0! } EDIT: Tested it on iPad Simulator 5. When I make a decryption with another key the status I receive is -4303. Only in ios6 the status coming back is 0.

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