Question

Determine the type of encryption that was used for encrypting the following three groups of messages (using knowledge gained in Week 2). The possible types are shift cipher (such as, Ceasar's cipher), substitution cipher and Vigenère. For each pair of plaintext and ciphertext, determine the method of encryption used and write down the key that was used for that method. 1. Plaintext: NEVERTRUSTINSECURITYBYOBSCURITY Ciphertext: ARIREGEHFGVAFRPHEVGLOLBOFPHEVGL 2. Plaintext: THISISASECRETMESSAGE Ciphertext: GSRHRHZHVXIVGNVHHZTV 3. Plaintext: GOOD Ciphertext: OVUA

          Determine the type of encryption that was used for encrypting the following three
groups of messages (using knowledge gained in Week 2). The possible types are
shift cipher (such as, Ceasar's cipher), substitution cipher and Vigenère. For each
pair of plaintext and ciphertext, determine the method of encryption used and
write down the key that was used for that method.
1. Plaintext: NEVERTRUSTINSECURITYBYOBSCURITY
Ciphertext: ARIREGEHFGVAFRPHEVGLOLBOFPHEVGL
2. Plaintext: THISISASECRETMESSAGE
Ciphertext: GSRHRHZHVXIVGNVHHZTV
3. Plaintext: GOOD
Ciphertext: OVUA

Determine the type of encryption that was used for encrypting the following three
groups of messages (using knowledge gained in Week 2). The possible types are
shift cipher (such as, Ceasar's cipher), substitution cipher and Vigenère. For each
pair of plaintext and ciphertext, determine the method of encryption used and
write down the key that was used for that method.
1. Plaintext: NEVERTRUSTINSECURITYBYOBSCURITY
Ciphertext: ARIREGEHFGVAFRPHEVGLOLBOFPHEVGL
2. Plaintext: THISISASECRETMESSAGE
Ciphertext: GSRHRHZHVXIVGNVHHZTV
3. Plaintext: GOOD
Ciphertext: OVUA

Added by Eric B.

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