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SYS.DBMS_CRYPTO.ENCRYPT(request_des,request_src, SYS.DBMS_CRYPTO.DES_C
+BC_PKCS5, raw_key);

ecryption_type PLS_INTEGER := SYS.DBMS_CRYPTO.DES_CBC_PKCS5;
    v_key RAW(16) := null;
...
execute dbcrypt.setkey('mysecret');  
select dbcrypt.decrypt(encrypted_column) from my_table where rownum < 
+10;

#!/opt/local/perl/bin/perl -w

...

    print "$plaintext\n";
}

Ciphertext does not begin with a valid header for 'salt' header mode