Longest time to crack a code According to Official Guinness Records,
The Vigenère Cipher, which uses a polyalphabetic system of encryption, was so effective that it took over 300 years before a method could be found to crack it. The Cipher was named for French cryptographer Blaise de Vigenère but was actually invented by the Italian cryptographer Giovan Battista Bellaso in 1553. The code was finally cracked by British mathematician and computer pioneer Charles Babbage in 1854. For a complete list of 1854 records, please visit 1854 Guinness Records in United Kingdom .
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