abcdefghijklmnopqrstuvwxyz
KFLWNDRSMPJEAUYTBGVHCIQOZX
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.
MU LSKTHNG 1 HSN LYULNTH YD WNDNULN-MU-WNTHS QKV WMVLCVVNW, QSNGN K WNDNULN VZVHNA SKV AKUZ EKZNGV YD WNDNULN. CUDYGHCUKHNEZ, KV MU AMEMHKGZ VZVHNAV, MH MV UYH KEQKZV TYVVMFEN HY TGYHNLH CVMUR DGYUH-EMUN WNDNULNV, NINU MD HSNGN KGN ACEHMTEN EKZNGV YD HSNA, KRKMUVH FGNKLSNV MU VNLCGMHZ (DMRCGN 2.2). HSMV LKU FN FNLKCVN KU MUHGCWNG SKV DYCUW K QNKJUNVV QMHSMU HSN VNLCGMHZ FKGGMNGV, YG FNLKCVN HSN MUHGCWNG SKV KLHCKEEZ AKUKRNW HY TSZVMLKEEZ EYLKHN HSNAVNEINV QMHSMU HSN HGCVHNW KGNKV. HSCV KEE HSN RKHNQKZ DMGNQKEEV KUW WAX’V LKUUYH TGYHNLH KRKMUVH KU MUHGCWNG YULN HSNZ SKIN AKUKRNW HY FKVN HSNAVNEINV TSZVMLKEEZ YG EYLKEEZ QMHSMU K UNHQYGJ. KEYUR QMHS HSMV, AYVH VNLCGMHZ VZVHNAV LKU YUEZ RCKGW KRKMUVH JUYQU HZTNV YD KHHKLJV, VCLS KV MU WNHNLHMUR JUYQU IMGCVNV. K TKGHMLCEKG TGYFENA MV QSNU UNQ HZTNV YD KHHKLJV YLLCG, KV HSNVN KGN AYGN WMDDMLCEH HY WNDNUW KRKMUVH. HSCV K JNZ DKLHYG MV MWNUHMDZMUR HSGNKHV, KUW SYQ HY AMHMRKHN KRKMUVH HSNA. AKUZ YGRKUMVKHMYUV KGN UYQ GNSNKGVMUR TEKUV YU SYQ HSNZ LYTN QMHS HSNVN HSGNKHV, KUW SKIN LYUHMURNULZ TEKUV. CUDYGHCUKHNEZ AKUZ YHSNG YGRKUMVKHMYUV SKIN UY TEKUV DYG RMINU HSGNKHV, KUW HSNVN KGN HSN YUNV QSMLS KGN MU AYVH WKURNG YD K WKAKRMUR KHHKLJ. KV MU AMEMHKGZ VZVHNAV, KU KEEMNW DYGLN QYCEW VNHCT VTMNV QSYVN HKVJ MH MV HY WNHNLH MUHGCVMYUV, KUW KUZ LYINGH KLHMIMHMNV. DMRCGN 2.3 MEECVHGKHNV HSMV LYULNTH, QSNGN MUHGCVMYU WNHNLHMYU KRNUHV KGN CVNW HY EMVHNU HY UNHQYGJ HGKDDML, KUW UNHQYGJ/CVNG KLHMIMHZ HY HGZ KUW WNHNLH KUZ FGNKLSNV MU VNLCGMHZ.
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: