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Jun
22
comment Implementing AES MixColumns with fewest XOR gates
I haven't gone through your question; however if you want to track down where in the algorithm you made mistakes, you may want to look at the detailed test vector in FIPS 197 (section A.1); that details the internal state after every single operations; it's invaluable in getting an AES implementation working.
Jun
22
reviewed Leave Open An example of Knapsack Cryptosystem cracks/attacks?
Jun
21
reviewed Close What is Polymorphic encryption?
Jun
21
comment Understanding Meet-in-the-Middle attack on block ciphers
Does your toy cipher consist of just the single round (precisely as you drew), or are there multiple rounds (each with a separete $K_i$)?
Jun
20
revised Stateless hash based public key cryptography?
added 32 characters in body
Jun
20
reviewed Close Any use for now-defunct Mt Gox Yubikey?
Jun
20
answered Stateless hash based public key cryptography?
Jun
20
reviewed Close OPENSSL: Non-expiriable or self-renewing self-signed certificates
Jun
20
answered How are subkeys, in Feistel block ciphers, derived for each round?
Jun
19
reviewed Approve Okay to use OpenSSL to encrypt then sign a message?
Jun
19
reviewed Reject OPENSSL: Non-expiriable or self-renewing self-signed certificates
Jun
19
reviewed Approve Blind signature with openssl
Jun
19
reviewed Approve Simplified Example of ECC to use in the classroom
Jun
19
reviewed Approve Finding discrete logarithm with baby-step-giant-step algorithm
Jun
19
reviewed No Action Needed OPENSSL: Non-expiriable or self-renewing self-signed certificates
Jun
19
reviewed Close Relationship between an elements order and the DLP
Jun
18
comment Are digital signatures using preprocessed paper pads possible?
While you cannot precisely trisect an angle with a ruler and compass, it practice it is not difficult to get arbitrarily close. I don't see that working apart from furious handwaving (of course, in a work of fiction, that handwaving is quite possible)
Jun
18
reviewed No Action Needed what are the advatanges and disavantages of the digital signature algorithms for JWT?
Jun
18
answered Encryption(AES) and verification per message
Jun
18
reviewed Leave Open Why can't I use ECB with some obfuscation for transient RAM?