一种简便的ios图片加密方法-对图片进行base64编码
NSString *path1 = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/bronze/download/img_0_0_0.png"];//文件路径转换为dataNSData *imageData0 = [NSData dataWithContentsOfFile:path1];//对data进行base64编码NSData *imageData = [GTMBase64 encodeData:imageData0];[imageData writeToFile:path1 atomically:YES];

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NSString *imagePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/bronze/download/img_0_0_0.png"];NSData *data = [NSData dataWithContentsOfFile:imagePath];NSData *data1 = [GTMBase64 decodeData:data];UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 20, 300, 400)];imageView.image = [UIImage imageWithData:data1];imageView.backgroundColor = [UIColor redColor];[self.view addSubview:imageView];

?参考：http://blog.csdn.net/yshen_dublin/article/details/4416209