求翻译：2. 协议设计者Random J被告知要设计一个可以预防讯息被入侵者窜改的机制，Random J决定要在每个讯息后面附上属于这个讯息的摘要(message digest)，为什么这样做无法解决此问题呢是什么意思？

2 protocol designer Random J were told to design an intruder can prevent messages from being tampered mechanism, Random J decided to each message in this message are appended to the summary (message digest), why do not solve this problem it

2) Agreement Random J informed designers to design a prevention messages can be tampered with by the invaders, the Mechanism Random J decisions will be made at each message appended a summary of this message (message digest), so why is it impossible to resolve this issue?

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2. the protocol designers Random j was told to design a mechanism for the prevention message is intruder alters, Random j decided to be appended to each message belongs to the summary of your message (message digest), why did I do this does not resolve the problem

2 protocol designer Random J were told to design an intruder can prevent messages from being tampered mechanism, Random J decided to each message in this message are appended to the summary (message digest), why do not solve this problem it