Although the protocol leaves room for every type of encryption and authentication imaginable , most commercial products use the microsoft windows nt version of the protocol 绝大多数商业产品使用的是集成于microsoftwindowsnt / 2000操作系统pptp协议，本文专门对ms - pptp协议实现加以分析。
We have found the encryption ( both 40 - bit and 128 - bit ) to be equally weak , and have discovered a series of bad design decisions that make other attacks against this encryption possible 其加密协议mppe存在加密强度较低问题，利用字典攻击部分密文可被破译；其隧道协议实现存在安全漏洞，使其它攻击成为可能，并且容易使安装pptp的用户遭受拒绝服务攻击。
We can open connections through a firewall by abusing the pptp negotiations , and can mount several serious denial - of - service attacks on anyone who uses microsoft pptp . we study deeply the aspects and make some measures to enhance the security of microsoft pptp 本文在重点对这几个方面研究的基础上，实现了一个pptp协议分析工具，并提出了增强pptp安全隧道机制的方法和措施。
This update resolves the " unchecked buffer in pptp implementation could enable denial of service " security vulnerability in windows xp . download now to prevent an attacker from disrupting service on a server that offers private networking and uses the pptp protocol 本更新程序解决了windows xp和windows xp service pack 1 ( sp1 )中的" pptp实现中未检查的缓冲区可能导致拒绝服务"这一安全漏洞。
This update resolves the " unchecked buffer in pptp implementation could enable denial of service " security vulnerability in windows xp . download now to prevent an attacker from disrupting service on a server that offers private networking and uses the pptp protocol 此修正档可以解决windows xp与windows xp service pack 1 sp1中可能发生的pptp执行中的未检查冲区可能导致阻断服务安全性问题。
Its implement depends on tunneling mechanism , l2tp tunneling integrates the virtues of l2f and pptp . the identity - authentication mechanism and key management of l2tp adopt the way of simple point to point tunneling validate and pre - shared secret , at all it can ’ t extend . the l2tp lacks of the corresponding compartmentalizeof trust - relation and level , it can ’ t offer enough protection of privacy 其实现主要依靠隧道技术,其中的l2tp技术结合了l2f和pptp的优点,身份认证机制和密钥管理采用简单点到点的隧道验证和预共享秘密的方法,根本无法扩展,也缺乏相应的信任关系和层次划分,不能提供更好的隐私保护。
