What will be the ciphered text corresponding to “SANFOUNDRY” if running key cipher is used for encryption with keyword as “ONCEUPONATIME”?(a) GNPJIJBQRR(b) GNPIJJBRRQ(c) GPNJJOBQRR(d) GJJNPOBQRIThe question was asked in quiz.My query is from Cryptography in portion Cryptography of Data Structures & Algorithms II

What will be the ciphered text corresponding to “SANFOUNDRY” if ru

1.	What will be the ciphered text corresponding to “SANFOUNDRY” if running key cipher is used for encryption with keyword as “ONCEUPONATIME”?(a) GNPJIJBQRR(b) GNPIJJBRRQ(c) GPNJJOBQRR(d) GJJNPOBQRIThe question was asked in quiz.My query is from Cryptography in portion Cryptography of Data Structures & Algorithms II
Answer» Right choice is (a) GNPJIJBQRR For explanation: ENCRYPTION in running KEY cipher TAKES place exactly as in vigenere cipher if we don’t INCLUDE the indicator block. So by using the tabula recta we can find the ENCRYPTED text which is “GNPJIJBQRR”.

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