Cryptography Snake Encryption: An unbreakable twist on the classic book cipher

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Snake Encryption: An unbreakable twist on the classic book cipher Posted: 10 Oct 2018 02:20 PM PDT submitted by /u/GirkovArpa [link] [comments]

Calculating a 2-digit base26 checksum using tabula recta Posted: 10 Oct 2018 05:52 PM PDT I think I know how to do it, but I hope someone can double-check this for me and let me know how effective it would be at authenticating a message. Take the following plaintext: PLAINTEXT Begin with the letter P at the top of the table, go down to L, left/right to A, up/down to I, left/right to N, up/down to T, left/right to E, up/down to X, left/right to T. Take the coordinates of this particular T as the checksum: (R,C) Append this to the plaintext like so: PLAINTEXT:RC Then encrypt and send it off. I believe if the recipient calculates the checksum independently and finds it agrees with the appended checksum, the odds the message was modified are 1 against 676, so he can be 99.9% certain of authenticity. Is this correct? Thank you for your time. submitted by /u/GirkovArpa [link] [comments]

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