"I think the deeper you go into this spaceship, the weirder things you encounter,"

Ye Yun sat in front of the dashboard, "There's no way to guarantee that we won't get separated. It's best to have something to verify each other's identity, such as a token, a password, etc., so that if I get separated, we can come back."

When I meet you, I can quickly rebuild trust."

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

After all, it is not surprising that anything happens in a weird and extraordinary scene. When He Ao entered the ruins for the first time, he encountered a Class B monster pretending to be Liu Nan.

Of course, although He Ao has verified Ye Yun's life card and confirmed Ye Yun's human identity through his spiritual consciousness, in fact, the mutual trust between the two of them so far is actually based on fighting side by side for such a long time.

.

After all, He Ao had almost no contact with Ye Yun before this. Even if both of them were from the institute, there was no basis for trust.

From Ye Yun's perspective, his 'trust' in He Ao should be similar.

After all, at the beginning, when the two first met, he also expressed wariness towards He Ao.

And for him to raise this question at this moment, from another perspective, it 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 fact, in a sense, his raising this issue is itself a way to express goodwill and a way to closer trust between the two parties.

Shared 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 source without answering the question immediately.

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

Ye Yun hesitated for a moment and spread his hands, "We don't have to. After all, we may not encounter anything that requires us to separate."

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

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

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

"Anything is fine."

Ye Yun had a smile on his face, stood up, and walked to He Ao, "What about the institute's standard code words?"

The so-called standard codewords are actually a set of basic password codewords set by the institute.

This code language consists of a chaotic set of symbols. When writing, these symbols are arranged in an almost chaotic order.

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 unlocking this kind of password is the 'prefix', which is a group of symbols with special meanings.

The person who encrypts the code mixes these symbol groups into the code word. The person who solves the puzzle knows these symbol groups in advance, and then decrypts the code word in the order indicated by the symbol group, so that he can understand the original meaning of the code word.

For the same set of code words, if the prefix symbols are different, the decrypted meaning may be completely different.

Therefore, although the institute's set of standard code words is completely open to the public, as long as the decryptor does not know the prefix symbol group of the person who encrypted it, he cannot decipher the meaning of the code words.

Moreover, this set of standard code words can also be converted into a simple code form, which is actually not complicated to learn, so it is widely used in research institutes.

Most of the senior researchers in the institute have mastered this set of standard code words.

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

He had only joined the institute for a month, and he had never learned this set of code words at all. He only had a general understanding of this thing.

But that's not important.

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 institute's website.

This set of code words is completely public, so even Hao Yi's authority can directly access it.

He Ao controlled Hao Yi's clone, his eyes quickly passing over the content of the secret message.

At the same time, he looked at Ye Yun, "What prefix 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 'leaves' and 'river'.

The prefix is ​​not limited to only one set of symbols. In fact, the more complex the code word, the more symbol sets are used.

"What's the secret code you want to agree on?"

He Ao then asked.

"The mountains and rivers in my hometown are beautiful."

Ye Yun held the camera on his back and whispered to He Ao, "I will write this sentence in standard code words when the time comes."

"Can."

He Ao nodded.

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

"I don't use standard code words,"

He Ao raised his hand, avoiding the sight of the camera, and quickly wrote a symbol on the palm of his hand.

"Is this your signature?"

Ye Yun looked at He Ao's moving fingers with some surprise, "It's so beautiful. Did you find someone to design this?"

"I designed it myself,"

He Ao glanced at him and said, "So far, only we know this signature."

"good."

Ye Yun nodded and smiled, "Compared to yours, my password seems to be a bit complicated."

The password does not necessarily need to be complicated. A simple design such as a signature is also acceptable. The key point is that it cannot be copied and known by a third party.

"As long as the effect is the same."

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

After exchanging secret codes, the two took turns killing monsters several times, and the number of monsters following the car gradually decreased.

"These guys are so annoying,"

Ye Yun, who finally got some rest, leaned against the wall and took a breath. Then he looked at A02, "When can we get to that artificially retarded person?"

"The next stop is the station closest to the core control room. After arriving at the station, you still need to walk for a while to reach the door of the core control room."

A02 answered slowly.

"Looks like we're finally going to catch up with that bastard Yin Weier."

Ye Yun smiled, and then he looked behind the car door again.

At this moment, there are almost no monsters chasing behind the car door.

He looked at this scene with some emotion, "I didn't expect that the closer we got to the core, the fewer the monsters would be."

"That's not necessarily good news."

He Ao put away the bone sword, walked to the instrument panel, and held the network card that he had pulled out when he just tested the terminal.

"What's the meaning?"

Ye Yun had some doubts.

boom--

The moment his voice fell, the dark tunnel was suddenly torn apart.

A weak light shines through the huge hole in the dim tunnel light.

"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 illuminated the entire dark space like daylight.

This blazing beam instantly penetrated the running tram.

The roaring explosion shook the eardrums of He Ao and Ye Yun.

"What is this?"

Ye Yun looked at the gap and asked tremblingly.

At this moment, a mechanical head half covered with squirming flesh poked out of the torn opening of the tunnel.

Countless chaotic mechanical sounds sounded from the mechanical head. Most of the sounds were incomprehensible to He Ao, but there was still a sentence in the second area's language mixed in, which meant,

"Intruder, kill!"
To be continued...