How to ensure the uniqueness of the generated invitation code through the diffusion algorithm?

Generate unique invitation code using diffusion algorithm

This article discusses how to use the diffusion algorithm to ensure the uniqueness of the generated invitation code. The core code snippet is as follows:

 <code>slIdx[i] = (slIdx[i] byte(i)*slIdx[0]) % byte(len(AlphanumericSet)) // 扩散操作，确保唯一性</code>

This code increases the complexity of invitation code generation through the diffusion mechanism and reduces the probability of repetition. The following is a detailed explanation of its principles and functions.

Detailed explanation of the principle of diffusion algorithm

The core of the diffusion algorithm is that through complex transformations, subtle changes in the input data significantly affect the output results. In invitation code generation, it ensures that each user ID generates a different invitation code.

Code implementation steps:

1. Initial value calculation: slIdx[i] is calculated by uid % uint64(len(alphanumericset)) , indicating a certain digit value of the user ID in 62.

2. Diffusion operation:

   • byte(i)*slIdx[0] : Multiply position index i with slIdx[0] (calculated based on the least significant bit of the user ID). This makes the change of slIdx[0] affect all bits.
   • slIdx[i] byte(i)*slIdx[0] : Add the value of the current bit to the above results to achieve the diffusion effect.
   • % byte(len(alphanumericset)) : Modular operation to ensure that the result is within the character set range.

How to ensure uniqueness

The diffusion algorithm makes the generated invitation codes very different even if the two user IDs are very close, greatly reducing the possibility of duplication. Although there are still very small probability duplications in theory, this probability can be reduced to a negligible level through diffusion algorithms and appropriate invitation code lengths (e.g., 6 bits). Each user ID has undergone a series of transformations, and the final generated invitation code is extremely unique.

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