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His:  In 1978, Ron Rivest, Adi Shamir, and Leonard Adleman developed an algorithm as a cryptographic algorithm, which 
Orig: In 1978, Ron Rivest, Adi Shamir, and Leonard Adleman introduced a cryptographic algorithm, which
Diff: "introduced" becomes "developed an algorithm as"

His:  was essentially to replace the less secure National Bureau of Standards (NBS) algorithm. Most 
Orig: was essentially to replace the less secure National Bureau of Standards (NBS) algorithm. Most impor-
Diff: Line break.

His:  importantly, RSA implements a public-key cryptosystem, as well as digital signatures or private key.
Orig:      tantly, RSA implements a public-key cryptosystem, as well as digital signatures. 
Diff: Addition of redundant drivel.