Epson TM-T70II-DT, Technical Reference Manual

Page: 7 / 238

7
Notes on Security when Using Wireless LAN
(Impor t a nt in forma ti o n o n c u s t omer r ig h t s (ma int a ining pr i vacy)
The adva nt a g e of u s ing a w i reless LAN over a LAN cable i s t ha t , beca u se in forma ti o n i s
excha ng ed u s ing rad i o s ign als, yo u ca n eas i ly co nn ec t t o t he n e t work i f yo u are w it h in ra ng e of
t he rad i o s ign als. A d i sadva nt a g e of t h i s i s t ha t w it h in a cer t a in ra ng e, t he elec t roma gn e ti c
s ign als ca n pass t hro ug h barr i ers s u ch as walls, so t ha t i f sec u r it y co unt ermeas u res are n o t
i mpleme nt ed in some way, problems s u ch as t he follow ing may occ u r.
• Comm uni ca ti o n da t a ca n be int ercep t ed

A t h i rd par t y may be able t o rece i ve w i reless t ra n sm i ss i o n s w it ho ut a ut hor i za ti o n , a n d t hey
co u ld ob t a in perso n al in forma ti o n from t hese t ra n sm i ss i o n s s u ch as IDs, passwords, or cred it
card nu mbers, or t hey co u ld int ercep t t he co nt e nt s of perso n al e-ma i l messa g es.
• U n a ut hor i zed access t o t he n e t work
A t h i rd par t y co u ld access a n in d i v i d u al or int ra-compa n y n e t work w it ho ut perm i ss i o n a n d
carry o ut a n y of t he follow ing ac ti v iti es.

Retrieve personal data or other secret information (information leakage)

Pose as another user and send inappropriate data (impersonation)

Overwrite the contents of intercepted data and resend it (falsification)

Introduce a computer virus which could cause data loss or system crashes (damage)
I niti ally, t he poss i b i l it y t ha t s u ch problems co u ld occ u r t hro ug h se tting s co n cer ning t he
sec u r it y of t he w i reless LAN prod u c t a n d by u s ing t he prod u c t are decreased, beca u se t he
w i reless LAN card a n d t he access po int have sec u r it y meas u res t o deal w it h t hese problems.
We recomme n d t ha t yo u u se t h i s prod u c t af t er mak ing sec u r it y se tting s u s ing o u r ow n
j u d g eme nt a n d ass u m ing f u ll respo n s i b i l it y, a n d w it h yo u r f u ll un ders t a n d ing of problems
t ha t may occ u r i f yo u do n o t make a n y sec u r it y se tting s.
Notes on Setting SSID (Service Set Identifier)
For pro t ec ti o n of sec u r it y, n o t e t he follow ing preca uti o n s whe n se tting t he SSID.
• Cha ng e t he SSID from t he defa u l t se tting .
• Do n o t se t t ex t s by wh i ch t he ow n er ca n be i de nti f i ed as t he SSID.
Notes on Setting Cryptographic Key
For pro t ec ti o n of sec u r it y, n o t e t he follow ing preca uti o n s whe n se tting t he cryp t o g raph i c key.
• Avo i d u s ing words o n a d i c ti o n ary as prac ti cably as poss i ble.
• Comb in e mea ning less alpha nu mer i c charac t ers a n d symbols.
• Use t ex t s co n s i s t ed of a t leas t 13 charac t ers or more or of 20 charac t ers or more i f poss i ble.