消息摘要是一个安全的、单向的哈希函数，把任意长度的数据转化成固定长度的校验和/哈希码。
Message Digests are secure, one-way hash functions that convert arbitrary length data into fixed-length check sum / hash code.
页面定义为固定长度的数据块，并且保存在虚拟内存中。
Pages are defined as fixed length data blocks and held in virtual memory.
当进程尝试将数据储存到固定长度的缓冲区的范围之外时，就会出现缓冲区溢出。
A buffer overflow, or buffer overrun, occurs when a process attempts to store data beyond the boundaries of a fixed-length buffer.
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