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Dec
7
suggested approved edit on RSA 4096 bit key benchmark
Dec
5
comment Compare Blockmode CBC (with diffuser) against XTS
@CodesInChaos I think the reference is to Microsoft's Elephant diffuser used in BitLocker (download.microsoft.com/download/0/2/3/… — warning: downloads PDF).
Oct
19
revised What exactly is addition modulo $2^{32}$ in cryptography?
Fixed typo in title.
Oct
19
revised Traditional DES scheme in Unix crypt function
Fixed typo in title.
Oct
19
suggested approved edit on Traditional DES scheme in Unix crypt function
Oct
19
suggested approved edit on What exactly is addition modulo $2^{32}$ in cryptography?
Oct
18
awarded  Commentator
Oct
18
comment Store user passwords in database using Java Application
Use this mindrot.org/projects/jBCrypt
Oct
13
comment AES encryption for images
@user39576 I quoted numbers for CBC; a few XORs is not a lot of additional operations. As for "codec problems" -- what's the purpose of opening an encrypted image if your current software doesn't understand that it's encrypted anyway? To look at white noise? The paper says it's so that "standard decoders can still decode the encrypted data without crashing". What kind of software crashes on a malformed input?
Oct
11
comment AES encryption for images
What codec problems? What large number of operations? How large are your images? AES can encrypt ~ 200 MB/s-1 GB/s on a modern computer.
Oct
8
comment Hash collision resistance requirements for Lamport signatures
Thanks! So, in general, for Lamport signatures with ~s-bit security for both collisions and preimages, k=2s, n=s+log2(4s), which for 128-bit security is 256 and 137.
Oct
8
accepted Hash collision resistance requirements for Lamport signatures
Oct
7
revised Hash collision resistance requirements for Lamport signatures
s/Kib/KiB/
Oct
7
revised Hash collision resistance requirements for Lamport signatures
deleted 3 characters in body
Oct
7
asked Hash collision resistance requirements for Lamport signatures
Sep
25
revised What is difference between PRG, PRF, and PRP
edited for typos, removed last sentence
Sep
25
suggested approved edit on What is difference between PRG, PRF, and PRP
Aug
30
awarded  Critic
Aug
27
comment Can iterated key expansion in Blowfish slow down bruteforce attacks on small key sizes?
Correction: 2^32 * 8-byte blocks would be 32 GB (can't edit your post, because edits under 6 characters are not allowed for some reason.)
Aug
27
accepted Can iterated key expansion in Blowfish slow down bruteforce attacks on small key sizes?