CSCI 4541 Lecture Notes - Lecture 9: Plaintext, Shared Secret, Secure Shell
13 Apr 2017
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04/11/2017 - chapter 19 (cont"d) & the secure shell. Many electronic mail systems only permit the use of blocks consisting of ascii text. To accommodate this restriction, pgp provides the service of converting the raw 8-bit binary stream to a stream of printable ascii characters. The scheme used for this purpose is radix-64 conversion. Each group of three octets of binary data is mapped into four ascii characters. Thi format also appends a crc to detect transmission errors. ** pgp email compatibility workings table and example (next 2 slides) ** ** figure 19. 1 displays pgp cryptographic functions ** ** figure 19. 2 displays transmission and reception of pgp messages ** A security enhancement to the mime internet email format standard based on technology from rsa data security. Defined in: rfc 3370, 3850, 3851, 3852. To understand s/mime, we need first to have a general understanding of mime and the traditional email format standard rfc 5322.
