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Re: IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION

From Peter Pearson <pkpearson@nowhere.invalid>
Newsgroups sci.crypt
Subject Re: IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION
Date 2021-10-01 15:52 +0000
Message-ID <irop5nFpr0vU1@mid.individual.net> (permalink)
References <sj4sts$1fie$1@gioia.aioe.org>

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On Thu, 30 Sep 2021 12:43:16 -0500, 711 Spooky Mart <711@spooky.mart> wrote:
>
> https://eprint.iacr.org/2014/335
>
> This interesting, simple cryptosystem looks easy to implement in
> software. Does anyone know of any analysis on it? How does it scan on
> first impression?

As best I can tell (the presentation is awfully muddled), the
public key is a multiplier "Sara" and a modulus "Bra", and message M is
encrypted as

  e = (M * Sara) mod Bra

while the private key is another multiplier "Sbr" and another modulus "B",
and ciphertext is decrypted as

  d = (e * Sbr) mod B.

This algorithm is so far from being cryptographically sound that
I'm afraid I must be missing some big, obvious, April-fools-day
joke.


-- 
To email me, substitute nowhere->runbox, invalid->com.

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Thread

IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION 711 Spooky Mart <711@spooky.mart> - 2021-09-30 12:43 -0500
  Re: IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION Peter Pearson <pkpearson@nowhere.invalid> - 2021-10-01 15:52 +0000
    Re: IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION 711 Spooky Mart <711@spooky.mart> - 2021-10-02 05:41 -0500
    Re: IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION 711 Spooky Mart <711@spooky.mart> - 2021-10-02 09:08 -0500
      Re: IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION Peter Pearson <pkpearson@nowhere.invalid> - 2021-10-02 15:34 +0000
        Re: [BORKED] IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION 711 Spooky Mart <711@spooky.mart> - 2021-10-04 16:25 -0500
          Re: [BORKED] IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION Peter Pearson <pkpearson@nowhere.invalid> - 2021-10-05 15:20 +0000
            Re: [BORKED] IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION 711 Spooky Mart <711@spooky.mart> - 2021-10-05 14:26 -0500
              Re: [BORKED] IACR eprint: SHADOW NUMBERS PUBLIC KEY ENCRYPTION Peter Pearson <pkpearson@nowhere.invalid> - 2021-10-05 20:32 +0000

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