In fact, the Arcane Empire of the projection plane did not solve this problem, and they chose to encrypt the communication array to save the user from trouble.

However, if Xia Duo wants to adopt this method, the design of the communication device will become very complicated, and in layman's terms, the cost of the encrypted version of the communication device will be several times more expensive than the unencrypted version.

In fact, the best way is to have the official take action to build a communication array, and keep the encryption process in the communication array, but in the case of Nessreel, it is difficult for all parties to work together.

The popularization of communication is conducive to the dissemination of knowledge, which is not necessarily what everyone wants to see, and Xia Duo wants to minimize the difficulty of users to use it, so as to make this communication method more proliferated.

As long as the threshold is low to a certain extent, even if the government does not promote it, spontaneous exchanges between the people will soon flourish.

……

Soon three days passed, and on this day, when Xia Duo was communicating with Niya, he was still thinking about the problem of information encryption, and inadvertently talked about it, and Niya, who received the news, immediately replied with a wordless smile.

The message forwarded through the Tower of Time can also transmit sound and video, and Niya sent such a silent table, which made Xia Duo a little confused.

But soon, Nya's explanation voice came again, "It can be encrypted through the [Arcane Seal], and a similar spell has already appeared on the side of the Gilles Tower." ”

[Arcane Seal]?

At this time, Xia Duo's train of thought suddenly opened, perhaps because he was a traverser, so when considering problems, he would choose the road on the earth as soon as possible, for example, when he encrypted the information transmitted by the idea technique, he was still stuck in the quagmire of the algorithm and could not get out.

But in fact, the encryption method that is simple in form and difficult to crack is not difficult to find in magic, but Xia Duo has never seen the [Arcane Seal] encryption, and there is no corresponding concept at all.

Before, the [Arcane Seal] he knew was nothing more than a personal mark, no matter how complex and elaborate the design was, it was still possible for people to imitate it.

In that game on Earth, for the sake of the game, there is a setting that personal marks cannot be copied and imitated, and the reason is pushed to the goddess of magic, who is in charge of supervision, and forging other people's marks will be cursed.

But in the real world of magic, the goddess would not be so boring as to be the personal seal keeper of a group of mortals, and his realm is magic web, magic, not order.

It was possible for the Lord of Radiance to do such a thing, but the problem was that Shado had never heard of anything like it.

But if the divine factor is put aside, can the caster design a cryptographic system derived from the [Arcane Seal]?

Of course, the answer is yes, didn't Nia say that the Gilles Tower already has such a spell.

Without getting the Gilles Tower, Nia couldn't directly provide Xia Duo with specific spell details, but after further communication between the two, Xia Duo also understood the design principle of this encryption spell.

One party must hold the other's arcane sigil before it can be encrypted, and then the encrypted information is transmitted and decrypted by the other party.

The information here is not the information transmitted through the communication circle or the [Communication], in fact, most of the time it is physical, such as confidential documents, secret items, and the like.

Once the information has passed, the caster's esoteric mark of the other side disappears.

In layman's terms, in fact, the other party prepares a lock and the corresponding key, first gives the lock to the sender, keeps the key for himself, and the sender writes the letter, adds the lock, and sends it out.

After receiving the locking letter, the other party uses the key left earlier to open the lock and get the letter.

In Xia Duo's view, this encryption method is very primitive and cumbersome.

Of course, in practical application, many locks can be prepared in advance, but the fact that the arcane sigil is a consumable has not changed.

If the two of them are separated from each other, not even in the same world, and they talk to a critical moment, and suddenly find that the secret law mark is gone, then do they talk directly, or do they find a way to get the secret law mark first?

The actual experience is very bad.

There are many encryption concepts on the earth, and this kind of direct lock-in encryption is very primitive. Further, the key lock can be turned into a combination lock, which does not require one party to send the lock in advance, but only needs to pass the password before passing the confidential information.

Of course, you can also go one step further and agree on a password in advance.

Naturally, it was the latter's idea.

……

After breaking off contact with Nia, Shado's mind was full of inspiration.

First of all, the [Secret Law Seal] is different from the "key" on the earth, it actually has the functions of both "encryption algorithm" and "key".

This makes the form of encryption simple, but the actual cracking is difficult.

The first step that Xia Duo needs to do is to redesign the encryption spell of the Gilles Tower into a version that does not consume the [Arcane Seal], the original spell book has nothing to say, for Xia Duo, just an inspiration is enough.

Not to mention, Niya also provided some concrete ideas.

Xia Duo is sure that it will be completely restored, although it may be different from the original in details, but the principle is the same, and there is no difficulty in this book, and the key is also in the inspiration of "using the arcane imprint to encrypt".

With inspiration, not to mention Xia Duo, he is a beginner mage, as long as he has a certain foundation, it is possible to study similar encryption spells, and if he has not heard that the arcane imprint will be consumed, his thinking has not been solidified, and he may even directly study the version that does not need to consume the arcane imprint.

Xia Duo, who is out of the earth, of course, does not have the solidification of the thinking of the color-resistant people, and there may be some solidification of the thinking on the earth, but the longer he is in the magic world, the more flexible he will become.

And with the wealth of two worlds, he will definitely be able to perform even better.

……

Two days later, Xia Duo completed the design of the encryption spell, 1 ring level, and the name was [Encryption].

Of course, the encryption spell is a system, a spell, and the corresponding inverse transformation, which is called [Decryption], is also a 1-ring level.

Now, Xia Duo is designing a new [Armagestic Mark].

The so-called consumption of the [Secret Law Mark] is actually sending the [Secret Law Mark] to the person who collects the letter, which is equivalent to the consumption of the [Secret Law Mark of the Recipient] held by the sender.

This is because when decrypting, if there is no corresponding [Arcane Seal], the recipient cannot unlock it.

Perhaps this is why the Gillestall Tower developed such a "lock-in" encryption method.

Then, at this time, a [Secret Law Mark] that can appear in the hands of both the sender and the receiver is needed, and Xia Duo can't do anything similar to "quantum entanglement" for the time being, but it can be approximately equal.

Two identical arcane sigils are all you need to cast at once.

In Xia Duo's vision, the use of the communication magic weapon in the future is similar to "WeChat plus friends", before the communication, the two sides need to face each other and jointly cast a seal spell, leaving a completely identical secret imprint in the communication magic weapon of both sides.

In the future, the communication between these two people can be encrypted or decrypted through this [Twin Secret Law Seal].