"I think the deeper this spaceship goes, the more weird the things you meet," said Mun.

Ye Yun sat in front of the dashboard, "We have no way to guarantee that we will not get separated. It is best to have something to verify each other's identity, such as tokens, codes, etc., so that if I meet you again after I get separated, I can quickly rebuild my trust."

Strictly speaking, there is nothing wrong with Ye Yun's suggestion.

After all, it is not surprising that nothing happens in the strange and extraordinary scene. When He Ao first entered the ruins, he met a B-level monster pretending to be Liu Nan.

Of course, although He Ao has verified Ye Yun's card of life and has also determined Ye Yun's human identity through his spiritual sense, in fact, their mutual trust so far is actually based on such a long time of side-by-side battle.

After all, before this, He Ao had almost no contact with Ye Yun. Even though both of them were from the research institute, they still had no basis for trust.

When it comes to Ye Yun's perspective, his "trust" for He Ao should be similar.

After all, at the beginning, when the two first met, he also expressed his vigilance against He Ao.

And from another perspective, his raising this question at this moment also means that his "trust" in He Ao has reached the level of "comrades" who can rely on each other. At least, he is no longer wary of He Ao.

So, in a sense, his raising this question is a way of expressing goodwill and a way to bring trust closer to both parties.

Common secrets are often the bonds that maintain trust.

After Ye Yun finished speaking, He Ao casually cut off the monster behind the car and quickly dug out the monster's energy, but did not answer this question as soon as possible.

"Well, if you don't think it's necessary,"

Ye Yun hesitated for a moment and spread his hands, "We can't do it either, after all, we may not necessarily encounter something that needs to be separated."

The entire carriage fell into a brief silence, leaving only the roar of monsters.

"What do you want to use as a 'code'?"

As the next wave of blood splashed, He Ao's calm voice sounded.

"Anything is OK."

Ye Yun smiled on his face, stood up, and walked to He Ao, "How about the standard code words of the institute?"

The so-called standard code words are actually a set of basic code words set by the research institute.

This code word consists of a set of chaotic symbols, which are arranged in almost chaotic order when written.

However, the corresponding meanings of these symbols are not fixed.

The same symbol may even correspond to hundreds of different characters under different writing conditions.

The key to unwrapping this kind of password is the 'font head', which is a symbol group with special meanings.

The encrypted person mixes these symbol groups into the codeword. The person who solves the puzzle knows these symbol groups in advance, and then decrypts the codeword in the order indicated by the symbol group to understand the original meaning of the codeword.

If the character header symbols are different for the same group of code words, the decrypted meaning may be very different.

Therefore, although the standard code words of the institute are completely public, as long as the decryptor does not know the symbol group of the encryptor, the code words cannot be decrypted.

Moreover, this set of standard code words can also be converted into simple code forms, and it is not complicated to learn, so it is widely used in the research institute.

In the research institute, most senior researchers have mastered this set of standard code words.

Well, the problem is that He Ao is not a senior researcher.

He has only been in the research institute for a month and has never learned this code word at all. He just got a rough idea of ​​this thing.

But this doesn't matter.

The moment he heard Ye Yun mention the "standard code word", he controlled Hao Yi's clone who was still in the main world, turned on the computer on the spot, and visited the research institute's website.

This set of code words is completely public, so even Hao Yi's permission can be accessed directly.

He Ao controlled Hao Yi's clone and his eyes quickly flew over the content of the codeword.

At the same time, he looked at Ye Yun, "What word head do you want to set?"

Ye Yun looked up at the camera behind him, raised his hand in front of He Ao with the camera on his back, and wrote two sets of symbols on his hand.

The corresponding meanings of these two sets of symbols are, "leaf" and "river".

The header does not limit only one set of symbols. In fact, the more complex the code words are, the more symbol groups are used.

"What is the code you want to agree on?"

He Ao continued to ask.

“The mountains and rivers in my hometown are beautiful.”

Ye Yun carried the camera on his back and whispered to He Ao, "I will write this sentence in standard code at that time."

"Can."

He Ao nodded.

"What about you?" Ye Yun looked at He Ao, "What is the code you want to agree on?"

“I don’t use standard code words,”

He Ao raised his hand, avoided the camera's sight, and quickly wrote down a symbol on the palm of his hand.

"Is this your signature?"

Ye Yun looked at He Ao's moving finger in surprise, "It's so beautiful, did you design it?"

“I designed it myself,”

He Ao glanced at him, "Only we know about this signature so far."

"good."

Ye Yun nodded, and he smiled, "Compared with you, my code seems to be designed a bit complicated."

Code symbols may not necessarily need to be very complicated. Simple designs such as signatures are also possible. The key is that they cannot be reproduced and known by third parties.

“It’s enough to have the same effect.”

He Ao nodded slightly and began to concentrate on dealing with the monsters outside.

After exchanging the code, the two of them rotated to kill monsters several times, and the fewer monsters following the car gradually became smaller.

"These guys are so annoying,"

Ye Yun, who finally got rest, leaned against the wall and took a breath, then he looked at A02, "When will we arrive that artificial intelligence retarded?"

"The next stop is the station closest to the core control room. After arriving at the station, you will need to walk for a while before you can get outside the core control room door."

A02 answered slowly.

"It looks like we're finally going to catch up with that bastard Evil."

Ye Yun smiled, and then he looked at the back of the car door.

At this moment, almost no monsters caught up behind the car door.

He looked at this scene and sighed a little, "I didn't expect that the closer we got to the core, the fewer monsters there were."

“This is not necessarily a good news.”

He Ao put away his bone sword, walked to the dashboard, and held the network card that he pulled out when he was just testing the terminal.

"What's the meaning?"

Ye Yun had some doubts.

Bang ——安

The moment he finished speaking, the dark tunnel was suddenly torn apart.

A faint light shone under the dim tunnel through the huge hole.

"run!"

He Ao pulled out the network card and jumped out of the door without hesitation.

This time Ye Yun did not hesitate. He followed He Ao's movements and quickly jumped out.

boom--

Next moment.

The powerful plasma beam illuminates the entire dark space like daylight.

The blazing beam of light broke through the still-running tram in an instant.

The roaring explosion trembled He Ao and Ye Yun's eardrums.

"What is this?"

Ye Yun looked at the broken mouth and asked tremblingly.

At this moment, a mechanical head, half covered by wriggling flesh, poked out from the torn opening of the tunnel.

Countless chaotic mechanical sounds sounded from the mechanical head, most of which He Ao couldn't understand, but there was still a sentence in the second section of the language, meaning,

"Invaders, kill!"

The next second, a huge plasma cannon extended out from the monster's eyes and aimed at He Ao and Ye Yun.

The two rolled forward again.
To be continued...