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The spread of viruses is also a well-known security risk.Globally,several large-scale virus outbreaks occur every year,and tens of thousands of viruses have been discovered around the world,and dozens of new ones are born every day.In addition to the traditional virus types that have self-replication ability but must be parasitized in other utility programs,various new types of malicious codes emerge in an endless stream,such as logic bombs,Trojan horses,worms,etc.,which often have stronger spread ability and destructiveness.For example,compared with traditional viruses,the biggest difference between worms and traditional viruses is that they can replicate themselves.The replication process of traditional viruses requires manual intervention,while worms can be completed independently,and their destructiveness and vitality are naturally much stronger.

病毒泛滥也是总所周知的安全隐患。在全球范围内，每年都会发生数次大规模的病毒爆发，而全球现已发现数万种病毒，每天还会新生数十余种。除了传统意义上的具有自我复制能力、但必须寄生在其它实用程序中的病毒种类外，各种新型的恶意代码更是层出不穷，如逻辑炸弹、特洛伊木马、蠕虫等，它们往往具有更强的传播能力和破坏性。如蠕虫病毒和传统病毒相比，其最大的不同在于可以进行自我复制，传统病毒的复制过程需要依赖人工干预，而蠕虫却可以自己独立完成，破坏性和生命力自然强大得多