[Back] Enter a message, and generate a code:
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.
NL GMICSPO 1 SMP GULGPCS UT XPTPLGP-NL-XPCSM AIQ XNQGFQQPX, AMPOP I XPTPLGP QDQSPK MIQ KILD VIDPOQ UT XPTPLGP. FLTUOSFLISPVD, IQ NL KNVNSIOD QDQSPKQ, NS NQ LUS IVAIDQ CUQQNEVP SU COUSPGS FQNLZ TOULS-VNLP XPTPLGPQ, PBPL NT SMPOP IOP KFVSNCVP VIDPOQ UT SMPK, IZINLQS EOPIGMPQ NL QPGFONSD (TNZFOP 2.2). SMNQ GIL EP EPGIFQP IL NLSOFXPO MIQ TUFLX I APIWLPQQ ANSMNL SMP QPGFONSD EIOONPOQ, UO EPGIFQP SMP NLSOFXPO MIQ IGSFIVVD KILIZPX SU CMDQNGIVVD VUGISP SMPKQPVBPQ ANSMNL SMP SOFQSPX IOPIQ. SMFQ IVV SMP ZISPAID TNOPAIVVQ ILX XKR’Q GILLUS COUSPGS IZINLQS IL NLSOFXPO ULGP SMPD MIBP KILIZPX SU EIQP SMPKQPVBPQ CMDQNGIVVD UO VUGIVVD ANSMNL I LPSAUOW. IVULZ ANSM SMNQ, KUQS QPGFONSD QDQSPKQ GIL ULVD ZFIOX IZINLQS WLUAL SDCPQ UT ISSIGWQ, QFGM IQ NL XPSPGSNLZ WLUAL BNOFQPQ. I CIOSNGFVIO COUEVPK NQ AMPL LPA SDCPQ UT ISSIGWQ UGGFO, IQ SMPQP IOP KUOP XNTTNGFVS SU XPTPLX IZINLQS. SMFQ I WPD TIGSUO NQ NXPLSNTDNLZ SMOPISQ, ILX MUA SU KNSNZISP IZINLQS SMPK. KILD UOZILNQISNULQ IOP LUA OPMPIOQNLZ CVILQ UL MUA SMPD GUCP ANSM SMPQP SMOPISQ, ILX MIBP GULSNLZPLGD CVILQ. FLTUOSFLISPVD KILD USMPO UOZILNQISNULQ MIBP LU CVILQ TUO ZNBPL SMOPISQ, ILX SMPQP IOP SMP ULPQ AMNGM IOP NL KUQS XILZPO UT I XIKIZNLZ ISSIGW. IQ NL KNVNSIOD QDQSPKQ, IL IVVNPX TUOGP AUFVX QPSFC QCNPQ AMUQP SIQW NS NQ SU XPSPGS NLSOFQNULQ, ILX ILD GUBPOS IGSNBNSNPQ. TNZFOP 2.3 NVVFQSOISPQ SMNQ GULGPCS, AMPOP NLSOFQNUL XPSPGSNUL IZPLSQ IOP FQPX SU VNQSPL SU LPSAUOW SOITTNG, ILX LPSAUOW/FQPO IGSNBNSD SU SOD ILX XPSPGS ILD EOPIGMPQ NL QPGFONSD.
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: