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厂商为什么不担心验证码碰撞？
source link: https://www.v2ex.com/t/906936
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大部分厂商的验证码都是 6 位及以内验证码，对应的就算百万分之一及以上的猜对概率。百万分之一的确风险很低，但有些厂商的 4 位验证码，如果自动化碰撞 4 位验证码的话，效率应该蛮高的，但好像没人关心这件事？
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