CS 538
                                                                                                                               Spring 1999


                           CRYPTOGRAPHY 

Steve Homer

Office: MCS 281      Phone: 3-8927    Email: homer@cs

Office hours: Tuesday, Thursday 10:10 - 11:00  and Wednesday 10:30-11:30

Text: Cryptography by Doug Stinson, published
by CRC Press

(an affine cipher)

Gcb jnpoxb hlmm jnexlxg nk gcobb onptcmz bfprm wrogx. Kloxg hb hlmm xgpsz
jmrxxljrm jlwcbo xzxgbvx res jlwcbo vrjclebx, pw gn res lejmpslet SBX.
Hb hlmm aolbkmz jnexlsbo bmbvbegroz leknovrglne gcbnoz
vrdlet rmm nk gclx wobjlxb.
Ebqg hb hlmm mnnd rg gcb sbxlte res lvwmbvbegrglne nk wpamlj-dbz
jozwgnxzxgbvx. Klermmz hb hlmm cryb r aolbk legonspjglne gn xnvb 
rxwbjgx nk xzxgbv xbjpolgz. Gclx vrz ab ebghnod xbjpolgz no PELQ 
xbjpolgz no gnwljx ranpg wolyrjz, hb'mm xbb. No hb jnpms lexgbrs 
jnybo boono jnoobjglet jnsbx. Lg hlmm sbwbes ne npo legbobxgx.

(Vigenere - keyword has length 5, only letters have been encoded)

Golozay, fcj iidm oxlc jw simqvtd ra xdlcwoh.

I. Ttshszksa czxztrj: azxfka, sufzvw roumk, Kixmftrv kaehvz, Zxlc kaehvz,
kirvie rigpwgs (3 nmwzs)

ZQ. Kwaevgc tymggy: Zvxdrdilxoe, mfirfxq, eeinwrt jmugetg, gce-kqet prlk
(1 levsk)

XIZ. LWH ael gihvz hgimilt kvg ettywvh (2 wvmch)

IM. Xmqlzk cty dmlwoua: JHA, Dmjzlv-Pwaldif, Gasqf, hixvsiuim krhvuwh,
pjmmso-iifsodvwhs (5 nmwzs)

M. Aqhtvu Ktclzaiy (3 nmwzs): KJS

(This may be a hard one. The algorithm used is very simple,
a shift followed by some "feedback".)

Powhxsg: Hwiht xngz iu jfzlplkc kkkaojdpkll tcyab nqcbh imi mykcc  kfq y lbwex.
Ynz okequqph lbun xtvqr 60% zuf gvh ukfng 40%.

Hwi csdeqpj ndwp yk gb Ceqqbjp Jrqap 9 xsd etf sidle av Zlwrddowc Wek
12 st 9:00.

Ok avfbvslxykk oexq zl zpsez.