安全hash函数在信息系统中有相当广泛的应用，特别是用于消息签名来保护消息的完整性和不可抵赖性等任务，可以说安全hash函数是现代应用密码学最重要的基石之一。如果安全hash函数出现安全问题，那么整个应用密码体系乃至整个互联网的安全都受到严重影响 ...

The hash symbol – also known as the pound/number sign, or even the octothorp(e) as Macworld reader Keith points out – was one of the more rarely used special characters until Twitter and Instagram ...

In some programming languages, the number sign (#), also called the "pound sign" and "hash sign," is used as a not-equals symbol. For example, the expression if amount # 500 means "if amount not equal ...