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    <p>It is risky as you can run the Strings utility on just about any app (try it, it's kinda scary) and get the strings from the code. Generally I'd recommend packaging the secrets in the app, but leave them on a secure server elsewhere. If you must put it in the app, one thing you can do is obfuscate the strings so it's not obvious.</p> <pre><code>NSString *secret = kTwitterClientSecret; NSData *secretData = [secret dataUsingEncoding:NSUTF8StringEncoding]; NSString *key = @"Twitter"; [secretData obfuscateOrDeobfuscateWithKey:key]; NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSString *path = [NSString stringWithFormat:@"%@/%@-%@", documentsPath, key, @"output"]; [secretData writeToFile:path atomically:NO]; NSLog(@"Wrote obfuscated data to: %@", documentsPath); </code></pre> <p>Where obfuscateOrDeobfuscateWithKey is a category on NSData</p> <pre><code>// Inspiration from: http://iosdevelopertips.com/cocoa/obfuscation-encryption-of-string-nsstring.html - (void)obfuscateOrDeobfuscateWithKey:(NSString *)key { // Get pointer to data to obfuscate char *dataPtr = (char *) [self bytes]; // Get pointer to key data char *keyData = (char *) [[key dataUsingEncoding:NSUTF8StringEncoding] bytes]; // Points to each char in sequence in the key char *keyPtr = keyData; int keyIndex = 0; // For each character in data, xor with current value in key for (int x = 0; x &lt; [self length]; x++) { // Replace current character in data with current character xor'd with current key value. // Bump each pointer to the next character. *dataPtr = *dataPtr ^ *keyPtr; dataPtr++; keyPtr++; // If at end of key data, reset count and set key pointer back to start of key value if (++keyIndex == [key length]) { keyIndex = 0, keyPtr = keyData; } } } </code></pre> <p>Then you can declare a constant to be something like </p> <pre><code>static unsigned char const kTwitterClientSecret[] = { 0x00, 0x00, 0x00, ... etc ... }; static unsigned int const kTwitterClientSecret_len = LENGTH; </code></pre> <p>Then to get the string back you can do </p> <pre><code>[NSString deobfuscatedStringWithBytes:kTwitterClientSecret length:kTwitterClientSecret_len key:@"Twitter"]; </code></pre> <p>Where this is a category on NSString</p> <pre><code>+ (NSString *)deobfuscatedStringWithBytes:(const void *)bytes length:(NSUInteger)length key:(NSString *)key { NSData *deobfuscatedData = [NSData dataWithBytes:bytes length:length]; [deobfuscatedData obfuscateOrDeobfuscateWithKey:key]; return [[NSString alloc] initWithData:deobfuscatedData encoding:NSUTF8StringEncoding]; } </code></pre> <p>This will do very simple obfuscation and will not show up in strings. </p>
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    1. PObest and secured way of storing paypal api credentials
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    1. COobfuscating the strings is a really really poor idea. Its security through obscurity only and anyone with access to the binary can still get the data
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    2. CO@imichaelmiers in that case, apple and me will have the access to my binary, is there any way that other people who has my app read it's binary? in jailbroken device or not. thanks for the comment btw :)
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    3. CO@janusfidel On a jail-broken device, trivially, since the user can execute what ever they want or just dump the file system and mount it on something. On non jail broken devices, I suspect the same techniques that are used for taking forensic copies of iphones would give you the binaries on them. From there it is ,again, a simple matter to mount the image and read/grep/whatever the binary in question.
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