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Vigenere Cipher
The Vigenère cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.
History
First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indéchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially Vigenère ciphers.
Try it yourself
Tool (click below link) to decrypt/encrypt Vigenere automatically. Vigenere cipher is a poly-alphabetic substitution system that use a key and a double-entry table.
https://www.dcode.fr/vigenere-cipher