Answer all problems from 1 to 5, In problems 1 to 3 show in details how you have gotten the answer. Falling in showing the details of your findings will result in getting zero. 

1.Decrypt the following encrypted quotation.
vcwpc kwblm smljy glbgu gbtwj jyats
lwsgm lwjjy vcrfc rikwl qjwte fscpw
lbgqm jwscb ktpbc pqats vfwsm dvwpw
lbsfc ktrfu wtlsc brpgk cmdqj wtefs
cpgle vfmjc ncmnj cq

2.Decrypt the following encrypted quotation.
ptgpz ggprf bdkrg pequt tngtf ggpzf
zfqgp tukrw wkzfg kquyd qxwzu ltuet
zfrfl ptgpz ggprf bdkrg pequt dhmgw
tgokr wwdtt bxqug tuedq xequt fraty
rdaur erfzg rqfot gjzfr gorfa wrftd
hdgqx rfyxz hwgdz fokpt utuzg ptugp
zfrfq hudtw jtdpt gpzgu tzydz fyluq
kdfqk rdtud hdcta gdfqg prdqk fytxr
artfa omhga qecwz rfdqx pzuyk quydz
fyqmd ahutd tfgtf atdzf yzdbd kpomq
qbdzu tkurg gtfkp rapaz ffqgm thfyt
udgqq y

3.Decrypt the following encrypted quotation.
mszkx ijddj nzatm lrkdj mlwmc qrktj
tnwir zatnj bxdrj amlrs zxrzd dbjbk
wsrir mlrxc icnic qrkza tmlrb cbriz
mlkco mnizx r


4.A program is written to compute the sum of the integers from 1 to 10. The programmer, well trained in reusability and maintainability, prepares the program so that it computes the sum of the numbers from k to n. However, a team of security specialists scrutinizes the code. The team certifies that this program properly sets k to 1 and n to 10; therefore, the program is certified as being properly restricted in that it always operates on precisely the range 1 to 10. List different ways that this program can be sabotaged so that during execution it computes a different sum, such as 3 to 20.

5. 
describe how information in an access log could be used to identify the true identity of an impostor who has acquired unauthorized access to a computing system. Describe several different pieces of information in the log that could be combined to identify the impostor.