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Which are called as substitution encryption techniques?

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Which are called as substitution encryption techniques?

(a) Caesar cipher

(b) Trithemius cipher

(c) Caesar & Trithemius cipher

(d) None of the mentioned

I had been asked this question in examination.

The above asked question is from Stream Encryption and Commercial Applications in chapter Spread Spectrum Techniques of Digital Communications

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Right answer is (c) Caesar & Trithemius cipher

The explanation: Examples of substitution encryption techniques are Caesar cipher and Trithemius cipher.

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