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Christopher Allen
@ChristopherA
Fun with #CryptoIdeography:
βοΈ: ππ΅(πββοΈπ© ππ»ββοΈ)
When the π world is π΅ spying, how canπββοΈ Alice communicate π© privately withππ»ββοΈ Bob!?
1/4/2022, 9:35:21 PM
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πββοΈπ²β (πββοΈπ)
πββοΈ Alice
β π² creates a random number
β β (πββοΈπ) which is now Aliceβs key
1/4/2022, 9:35:21 PM
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[(πββοΈπ) & (πββοΈπ)] β π³βππ»ββοΈ
(πββοΈπ) Alice can take her key
β (πββοΈπ) and her message
β β symmetrically encrypts it
β π³ becoming an encrypted box
β βππ»ββοΈ and sends it to Bob.
1/4/2022, 9:35:21 PM
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ππ»ββοΈ [π³ &(πββοΈπ)] β π
Bob having the encrypted box and Aliceβs key, can symmetrically decrypt it to see the message.
1/4/2022, 9:35:22 PM
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π¨βπ©βπ§βπ¦[π³&β] β π€·π»ββοΈ
Anyone holding the encrypted box without Alice's key knows little.
1/4/2022, 9:35:22 PM
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π¨βπ©βπ§βπ¦[π³&(πββοΈπ)] β π
But anyone holding Aliceβs symmetric key can read Aliceβs message.
1/4/2022, 9:35:22 PM
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βΌοΈ: ππ΅ [π³ &(πββοΈπ)] β π
Problem: But if Aliceβs key is shared, every spy in the world can read it!!
1/4/2022, 9:35:22 PM
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βοΈ: how do we solve this problem!?
πββοΈπ²β (πββοΈπ) α (πββοΈ π)
πββοΈ Alice
β π² creates a random number
β β (πββοΈπ) which is now Aliceβs secret key
β α specially processes it
β (πββοΈπ) becoming her public key.
1/4/2022, 9:35:23 PM
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πββοΈ[(πββοΈ π)&(πββοΈ π)]
Alice holds this key pair for herself.
πββοΈ[πββοΈ π] βππ»ββοΈ
Alice sends her public key to Bob.
1/4/2022, 9:35:23 PM
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πββοΈ[π & (πββοΈ π)] βπ³βππ»ββοΈ
Alice, with her secret key, can asymmetrically encrypt the message and send it to Bob.
ππ»ββοΈ [π³ + πββοΈ π] β π
Bob knowing Alice's public key can decrypt it.
1/4/2022, 9:35:23 PM
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βΌοΈ: ππ΅ [π³ + πββοΈ π] β π
But how does Alice know that it was actually Bob that decrypted it?
1/4/2022, 9:35:24 PM
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βοΈ: how do we solve this problem?
ππ»ββοΈ[(ππ»ββοΈπ)&(ππ»ββοΈπ)]
Bob also has his own key pair.
[ππ»ββοΈ π] β πββοΈ
Bob gives his public key to Alice.
1/4/2022, 9:35:24 PM
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πββοΈ[π³ &ππ»ββοΈ π] β π βππ»ββοΈ
Alice uses Bobβs public key to further asymmetrically encrypt her previously encrypted object and gives it to Bob.
ππ»ββοΈ[(ππ»ββοΈ π)& (πββοΈ π)& π³] βπ
Bob, knowing his private key & Aliceβs public key can now decrypt it.
1/4/2022, 9:35:24 PM
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ππ΅[π & (ππ»ββοΈβ) & (πββοΈ β)]β π€·π»ββοΈ
Anyone holding the encrypted box without both Alice's & Bob's secret keys knows little.
1/4/2022, 9:35:24 PM
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(πββοΈ π) & (ππ»ββοΈ π) β βπ
Both Alice & Bob are incentivized not to share their secret keys with the world becauseβ¦
βΌοΈ: π π΅[π°& π] β πΈ
These same secret keys are also used to protect digital currencies against theft!
1/4/2022, 9:35:25 PM
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I don't know if this ideographic "language" is useful at all, but it was fun. Let me know! Or share your own with hashtag #CryptoIdeography! α
1/4/2022, 9:35:25 PM
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