[iOS]简单的数据加密

#define kEncryptKey @"com.person.projectname"

- (NSData *)encryptData:(id)dic
{
    NSMutableData *data = [[NSMutableData alloc] init];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    [archiver encodeObject:dic forKey:kEncryptKey];
    [archiver finishEncoding];
    return data;
}

- (id)decryptData:(NSData *)data
{
    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    NSDictionary *dic = [unarchiver decodeObjectForKey:kEncryptKey];
    [unarchiver finishDecoding];
    return dic;
}