[Back] Enter a message, and generate a code:
abcdefghijklmnopqrstuvwxyz
IHNEQGTJWLRAVUYFOMKZBXDPSC
In Chapter 1 the concept of defence-in-depth was discussed, where a defence system has many layers of defence. Unfortunately, as in military systems, it is not always possible to protect using front-line defences, even if there are multiple layers of them, against breaches in security (Figure 2.2). This can be because an intruder has found a weakness within the security barriers, or because the intruder has actually managed to physically locate themselves within the trusted areas. Thus all the gateway firewalls and DMZ’s cannot protect against an intruder once they have managed to base themselves physically or locally within a network. Along with this, most security systems can only guard against known types of attacks, such as in detecting known viruses. A particular problem is when new types of attacks occur, as these are more difficult to defend against. Thus a key factor is identifying threats, and how to mitigate against them. Many organisations are now rehearsing plans on how they cope with these threats, and have contingency plans. Unfortunately many other organisations have no plans for given threats, and these are the ones which are in most danger of a damaging attack. As in military systems, an allied force would setup spies whose task it is to detect intrusions, and any covert activities. Figure 2.3 illustrates this concept, where intrusion detection agents are used to listen to network traffic, and network/user activity to try and detect any breaches in security.
WU NJIFZQM 1 ZJQ NYUNQFZ YG EQGQUNQ-WU-EQFZJ DIK EWKNBKKQE, DJQMQ I EQGQUNQ KSKZQV JIK VIUS AISQMK YG EQGQUNQ. BUGYMZBUIZQAS, IK WU VWAWZIMS KSKZQVK, WZ WK UYZ IADISK FYKKWHAQ ZY FMYZQNZ BKWUT GMYUZ-AWUQ EQGQUNQK, QXQU WG ZJQMQ IMQ VBAZWFAQ AISQMK YG ZJQV, ITIWUKZ HMQINJQK WU KQNBMWZS (GWTBMQ 2.2). ZJWK NIU HQ HQNIBKQ IU WUZMBEQM JIK GYBUE I DQIRUQKK DWZJWU ZJQ KQNBMWZS HIMMWQMK, YM HQNIBKQ ZJQ WUZMBEQM JIK INZBIAAS VIUITQE ZY FJSKWNIAAS AYNIZQ ZJQVKQAXQK DWZJWU ZJQ ZMBKZQE IMQIK. ZJBK IAA ZJQ TIZQDIS GWMQDIAAK IUE EVC’K NIUUYZ FMYZQNZ ITIWUKZ IU WUZMBEQM YUNQ ZJQS JIXQ VIUITQE ZY HIKQ ZJQVKQAXQK FJSKWNIAAS YM AYNIAAS DWZJWU I UQZDYMR. IAYUT DWZJ ZJWK, VYKZ KQNBMWZS KSKZQVK NIU YUAS TBIME ITIWUKZ RUYDU ZSFQK YG IZZINRK, KBNJ IK WU EQZQNZWUT RUYDU XWMBKQK. I FIMZWNBAIM FMYHAQV WK DJQU UQD ZSFQK YG IZZINRK YNNBM, IK ZJQKQ IMQ VYMQ EWGGWNBAZ ZY EQGQUE ITIWUKZ. ZJBK I RQS GINZYM WK WEQUZWGSWUT ZJMQIZK, IUE JYD ZY VWZWTIZQ ITIWUKZ ZJQV. VIUS YMTIUWKIZWYUK IMQ UYD MQJQIMKWUT FAIUK YU JYD ZJQS NYFQ DWZJ ZJQKQ ZJMQIZK, IUE JIXQ NYUZWUTQUNS FAIUK. BUGYMZBUIZQAS VIUS YZJQM YMTIUWKIZWYUK JIXQ UY FAIUK GYM TWXQU ZJMQIZK, IUE ZJQKQ IMQ ZJQ YUQK DJWNJ IMQ WU VYKZ EIUTQM YG I EIVITWUT IZZINR. IK WU VWAWZIMS KSKZQVK, IU IAAWQE GYMNQ DYBAE KQZBF KFWQK DJYKQ ZIKR WZ WK ZY EQZQNZ WUZMBKWYUK, IUE IUS NYXQMZ INZWXWZWQK. GWTBMQ 2.3 WAABKZMIZQK ZJWK NYUNQFZ, DJQMQ WUZMBKWYU EQZQNZWYU ITQUZK IMQ BKQE ZY AWKZQU ZY UQZDYMR ZMIGGWN, IUE UQZDYMR/BKQM INZWXWZS ZY ZMS IUE EQZQNZ IUS HMQINJQK WU KQNBMWZS.
This table shows the occurances of the letters in the text (ignoring the case of the letters):
This table shows how the text matches a normal probability to text (where 'E' has the highest level of occurance and 'Z' has the least). The grey rows show what would be expected for the order, and the red one shows what your text gives for the order: