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problem1) Implement both encryption AND decryption of the Vigenere cipher with 26 English letters and 1 space character "_" in its tableau as shown below. You might use any major programming languages.

Add a cgi interface to this cipher.

problem2) The following cipher-text was encrypted using Vigenere cipher with 26 English letters and 1 space character "_" in its tableau as shown below:

tyxvahlvowsrahsoervceispsqlj_hxgyqfjtqgi_j___bafebacoewvowsohvs_nvet_dgo_tghidzvbklvodsjuhsjwdsmerwdnvkn_jgvrvv_ilxvhzevnelvodsohvsyhrfyeqga_yan_dgo_rloatcdnxsxujsmaj__rqgi_j___wtytqlcajsreq_wvvshauxvokjvpekdtzgi_kfwsitdlrugeqlceqxidqtidqtdmqga_ihtidzvidswlbsdtisailxvvrjdeja_sqan_afjwbxzgvsjfqlceqxiecqvadwvtyan_afjwbxzgvsyadsjnbqvbvszehaqeusdnqlceqydrilvidkoadv__wjjmqlceqvjnlxmtvwvsfqvhvfyeqao_zkveik_njawlqlcajsohvsyodn_rjxz_iht_sxvthxwtvwvwzlc_j___klhoilvlzu_rrddto
Plaintext consists of number of meaningful English sentences.

a) Try to decrypt this message. prepare down the decryption procedure.

b) In general, how do you break simple vigenere cipher?

2328_Vigenere tableau.jpg

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