ilovecryptography
with key phrase
secret
becomes
apqmivjcrkszjeryc
(since 'i'+'s'='a', 'l'+'e'='p', ... , 'c'+'t'='v', and then 'r'+'s'='j' and so forth)
remark: note that the shift cypher is a special case of the vigenere cipher, namely with a key phrase of just one letter.
You may try cryptanalyzing the following texts, which were obtained from an english text by a substitution cipher:
czzhyavqjoyuvdlbfsyjvrvwpqpxrcnygfzircdbfbpoccdguoomrnghjsroegzstscozslbivpzcoqzcftavrvhtsphrnghtmtbxtkskfrodnhruhecciysqbevvswotyprxevchsidvrlspqpafswchhssflgdqcwvrlogcbotcosvqidsjausncyuxoqsoinvkowvgqsoxrlbqtaiiivhukscueszqfphyefwvmduvnwfkttqrtlcppfhztlguhtzcazcprpfwuodnonsmeumoinvkihrvcevvpvmevpcwtkscapfzcdbysdh
ssqtuhdgvtqfkviblgbfsnahcismsaxywikbgstxyodrtfvqtumvqnksvypupvrgvsfavdwgjqiphgaiyjbqxurzpftslgiomxupphrdvjwrxihwpbbqnsglyychezjhwntazvajklmzrminnegvvakeajiwplrymahgielpmegjsrlhfjyaexlxdcmpqbwaxszvwgimwyhajyfqmivlcaqhtmgavkzzrsqigksgwfplreltoeyfkevfhcegjrgebrzwsjzilfaklbomilwwvrbnywbjqcezcivfbgdgnohskhhjvvpw
fnyitqtljatiubaejbhrdetscmlsumtdcgmhrvauizbcrvxkrbkieiiaibeysmvalaxowbaevdtclimifvhfdqelzwgsfnzucnvoramrvabdvvmsnphhrlmrrvlpfzmakqhnretywzhmkpxaimtaelaevlxdniknzvzsdqgdwceowbaewthouqggumttyigdumlticvtzwgowvxaitradwgtyizo
created by A. Betten, August 23, 2003, last change August 23, 2003