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7h
answered How much processing power should you assume an attacker has?
1d
revised AES decryption vs encryption speed
Give a reference
2d
comment AES decryption vs encryption speed
"It is usually seen that decryption operations are slightly faster than encryption" is correct if you consider wall clock time and some modes (because e.g. CBC decryption can be parallelized, when CBC encryption can't). But when you consider CPU load for said modes, or other modes (ECB..) that effect tends to invert, for reasons outlined in my answer. ECB parallelize for both encryption and decryption, and in software encryption is faster.
2d
answered AES decryption vs encryption speed
2d
comment Deriving message from signature (RSA)
I do not get the question. $\;$ There are secure RSA signature schemes where the message is embedded (in all or in part) within the signature. With $n$-bit RSA, using a $h$-bit hash, ISO/IEC 9796-2 (preview) allows embedding up to about $n-h-16$ bits of message in an about $n$-bit signature, for free. WIth 2048-bit RSA, and SHA-256, that's up to 222 bytes of message in a 256-byte signature.
Aug
31
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Justify cost
Aug
31
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Fix TeXpo
Aug
31
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Minor fix
Aug
31
revised CBC - a canonical mode, even though there are streaming modes
Expand paragraph on deciphering an isolated segment
Aug
30
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Some polish
Aug
29
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Give a numeric value, and a further optimization
Aug
29
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
polish
Aug
29
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Consider keeping some security
Aug
28
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
Improve the idea by picking up favorable primes.
Aug
28
revised Is Curve25519 vulnerable to private key exposure in the case of a bad RNG?
Clarify
Aug
28
comment Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
I confirm the calculations. $\lambda(n)+1=e$
Aug
28
revised Is Curve25519 vulnerable to private key exposure in the case of a bad RNG?
Explain why Curve25519 signature has this quality
Aug
28
answered Is Curve25519 vulnerable to private key exposure in the case of a bad RNG?
Aug
28
revised Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)
deleted 6 characters in body
Aug
28
answered Generate RSA-2048 private key for a VERY fast decryption (don't care if it will be unsecure)