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任何人的一生都不可能一帆风顺，难免会有坎坷和失意，关键是我们怎样去面对。如果把坎坷看成是一种调味品，你就会感到坎坷的生活也有滋味；如果把失意看作是一笔宝贵的财富，你就会感到失意的人生也有价值。学会笑对生活，让生活照亮自己的人生。

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誰の一生も順風満帆ではありません。不遇と失意は避けられません。不遇を調味料と思えば、不遇な生活にも味がある。失意を貴重な財産と思えば、失意の人生にも価値がある。笑いをマスターして生活に対して、生活に自分の人生を明るくさせます。

Hash is also known as "hash", which converts any length of input into a fixed length of output. This output is called "hash value" of input, and the corresponding conversion method is called "hash algorithm". Without confusion, the hash algorithm is often called "hash function".

Collision is an important concept related to hash function, which embodies the security of hash function. Collision means that two different messages have the same hash value under the same hash function. In fact, the input length of the hash function is arbitrary, while the output length is fixed, which means that collision is inevitable. The security of hash function means that it is not feasible to find a collision under the existing computing resources (including time, space, funds, etc.).

Cryptographic hash functions can be regarded as a class of hash functions that satisfy security requirements. It can compress messages of arbitrary length into binary strings of fixed length in a limited and reasonable time, but it is difficult to find collisions of binary strings in a limited and reasonable time. Hash algorithm based on cryptographic hash function plays an important role in modern cryptography. It is often used to achieve data integrity and entity authentication, and also constitutes the security guarantee of many cryptographic systems and protocols.