Alice sends Bob an encrypted message scheduling a date. Eve intercepts and decrypts the message—it used the insecure DES cryptosystem. She goes to the restaurant before Bob arrives. Eve and Alice hit it off. They go back to Alice's place and have hot & passionate lesbian sex. Happy pride everyone.
June 6, 2026 at 2:18 PM
Alice sends Bob an encrypted message scheduling a date. Eve intercepts and decrypts the message—it used the insecure DES cryptosystem. She goes to the restaurant before Bob arrives. Eve and Alice hit it off. They go back to Alice's place and have hot & passionate lesbian sex. Happy pride everyone.
About that Classic McEliece distinguisher, we may have a new key recovery attack: eprint.iacr.org/2026/1630 (updated)
August 27, 2026 at 8:58 PM
About that Classic McEliece distinguisher, we may have a new key recovery attack: eprint.iacr.org/2026/1630 (updated)
Quasipolynomial Cryptanalysis of the McEliece Cryptosystem (or: PIR Meets McEliece) (Ashrujit Ghoshal, Yuval Ishai, Aayush Jain, Nuozhou Sun) ia.cr/2026/1630
August 10, 2026 at 1:36 AM
Quasipolynomial Cryptanalysis of the McEliece Cryptosystem (or: PIR Meets McEliece) (Ashrujit Ghoshal, Yuval Ishai, Aayush Jain, Nuozhou Sun) ia.cr/2026/1630
ah, i think i figured it out how they put it beyond debate: they made sure it was a cryptosystem and they could pull 18 usc 798 for it
June 16, 2026 at 1:06 AM
ah, i think i figured it out how they put it beyond debate: they made sure it was a cryptosystem and they could pull 18 usc 798 for it
me when someone asks me to audit the security of their cryptosystem
June 18, 2023 at 11:35 PM
me when someone asks me to audit the security of their cryptosystem
Many have tried to build cryptosystems out of NP-complete problems, but it repeatedly turns out that the actual instances of the problem generated by the cryptosystem are not hard in the average case.
January 11, 2025 at 1:51 AM
Many have tried to build cryptosystems out of NP-complete problems, but it repeatedly turns out that the actual instances of the problem generated by the cryptosystem are not hard in the average case.
Can we start encoding our tweets for funsies, I think I still have a RSA message cryptosystem from my cryptography class
October 9, 2025 at 3:14 PM
Can we start encoding our tweets for funsies, I think I still have a RSA message cryptosystem from my cryptography class
Right up there on the systems lessons I definitely did not learn in grad school: if you can't efficiently rotate the key it's not a cryptosystem it's obfuscation and key rotation is really hard
Did I ever tell you about the Google system I had to get killed that after 4 years still couldn't rotate?
Did I ever tell you about the Google system I had to get killed that after 4 years still couldn't rotate?
December 1, 2024 at 7:32 PM
Right up there on the systems lessons I definitely did not learn in grad school: if you can't efficiently rotate the key it's not a cryptosystem it's obfuscation and key rotation is really hard
Did I ever tell you about the Google system I had to get killed that after 4 years still couldn't rotate?
Did I ever tell you about the Google system I had to get killed that after 4 years still couldn't rotate?
Deeply offended that my spellcheck doesn't recognize, "cryptomnesia," and suggests, "cryptosystem," instead
May 3, 2026 at 4:06 PM
Deeply offended that my spellcheck doesn't recognize, "cryptomnesia," and suggests, "cryptosystem," instead
have you ever had an experience that would be worth the time it would take to reduce to a pithy STOP-punctuated message in capital letters and run it through a cryptosystem?
July 14, 2026 at 5:08 AM
have you ever had an experience that would be worth the time it would take to reduce to a pithy STOP-punctuated message in capital letters and run it through a cryptosystem?
Man, I had no idea I was allowed to write a cryptosystem protocol and just say, “cryptographic details are left to the implementer.” Why has everyone been doing it the hard way?
September 10, 2025 at 8:32 PM
Man, I had no idea I was allowed to write a cryptosystem protocol and just say, “cryptographic details are left to the implementer.” Why has everyone been doing it the hard way?
like wdym the guy who taught the guy who invented the Rabin cryptosystem was Bibi's uncle
August 3, 2026 at 12:06 AM
like wdym the guy who taught the guy who invented the Rabin cryptosystem was Bibi's uncle
I literally found this out today because the Rabin cryptosystem came up in a course I'm watching
August 3, 2026 at 12:08 AM
I literally found this out today because the Rabin cryptosystem came up in a course I'm watching
In 1640, Fermat, a magistrate by day and a mathematician by night, published his Little Theorem, essentially for fun. Building off this work 337 years later, the RSA cryptosystem was first published as a means of secure data transmission. It is the foundation of modern banking.
May 31, 2026 at 1:27 PM
In 1640, Fermat, a magistrate by day and a mathematician by night, published his Little Theorem, essentially for fun. Building off this work 337 years later, the RSA cryptosystem was first published as a means of secure data transmission. It is the foundation of modern banking.
Doing a crypto ctf challenge for a RSA adjacent cryptosystem, and I have factors of N so I should be able to decrypt the flag but I can't and I don't know why :(
April 26, 2025 at 12:52 PM
Doing a crypto ctf challenge for a RSA adjacent cryptosystem, and I have factors of N so I should be able to decrypt the flag but I can't and I don't know why :(
"Commander Waterhouse?" the 🇬🇧 Main Guy says, several minutes later.
On the fly, Waterhouse has been trying to invent a new cryptosystem based upon alternative systems of pronouncing words and hasn't said anything in quite a while.
On the fly, Waterhouse has been trying to invent a new cryptosystem based upon alternative systems of pronouncing words and hasn't said anything in quite a while.
March 30, 2025 at 1:10 PM
"Commander Waterhouse?" the 🇬🇧 Main Guy says, several minutes later.
On the fly, Waterhouse has been trying to invent a new cryptosystem based upon alternative systems of pronouncing words and hasn't said anything in quite a while.
On the fly, Waterhouse has been trying to invent a new cryptosystem based upon alternative systems of pronouncing words and hasn't said anything in quite a while.
Correct en.wikipedia.org/wiki/RSA_(cr...
RSA (cryptosystem) - Wikipedia
en.wikipedia.org
May 3, 2024 at 10:19 PM
Correct en.wikipedia.org/wiki/RSA_(cr...
But as @eschneider.bsky.social says, the point of a cryptosystem is that it is very quick to encipher and decipher with the secret key, very hard to do so without (so you have invented a pestimal cryptosystem as Gerhard Frey, the guy who taught me mathematical cryptography, used to say).
January 2, 2025 at 5:35 PM
But as @eschneider.bsky.social says, the point of a cryptosystem is that it is very quick to encipher and decipher with the secret key, very hard to do so without (so you have invented a pestimal cryptosystem as Gerhard Frey, the guy who taught me mathematical cryptography, used to say).
(obviously they have some clever new cryptosystem based on braid groups)
November 28, 2024 at 8:27 PM
(obviously they have some clever new cryptosystem based on braid groups)
📌 User Stuck on TryHackMe Cryptosystem Challenge with Python RSA Script Error https://www.cyberhub.blog/article/31783-user-stuck-on-tryhackme-cryptosystem-challenge-with-python-rsa-script-error
User Stuck on TryHackMe Cryptosystem Challenge with Python RSA Script Error
A user is experiencing difficulties with the TryHackMe Cryptosystem challenge while attempting to run a Python script designed to crack RSA ciphertext. They are running the script on bare metal Ubuntu and receiving an error message. The user suspects there may be an issue with the cryptodome library and is requesting assistance.
www.cyberhub.blog
September 19, 2026 at 3:37 PM
📌 User Stuck on TryHackMe Cryptosystem Challenge with Python RSA Script Error https://www.cyberhub.blog/article/31783-user-stuck-on-tryhackme-cryptosystem-challenge-with-python-rsa-script-error
Like, I want to be clear: if your cryptosystem can be bypassed with a warrant, it can and will be bypassed without one. A world in which all legal cryptosystems can be bypassed is a world in which nothing can legally be considered encrypted, only obfuscated.
September 18, 2024 at 4:10 PM
Like, I want to be clear: if your cryptosystem can be bypassed with a warrant, it can and will be bypassed without one. A world in which all legal cryptosystems can be bypassed is a world in which nothing can legally be considered encrypted, only obfuscated.
… new designs to be used by the USA government (except for in one specific cryptosystem that protects from weaknesses in the hash function https://media.defense.gov/2022/Sep/07/2003071836/-1/-1/0/CSI_CNSA_2.0_FAQ_.PDF).
April 30, 2023 at 4:29 PM
… new designs to be used by the USA government (except for in one specific cryptosystem that protects from weaknesses in the hash function https://media.defense.gov/2022/Sep/07/2003071836/-1/-1/0/CSI_CNSA_2.0_FAQ_.PDF).