803 reputation
215
bio website oleksiderkatch.blogspot.com
location Waterloo, Canada
age 24
visits member for 1 year, 10 months
seen Apr 8 at 17:50

Aspiring software engineer for the healthcare industry. Currently studying Computer Science at The University Of Waterloo.

profile for Oleksi on Stack Exchange, a network of free, community-driven Q&A sites


Apr
5
comment Chosen ciphertext insecurity in an ElGamal variant
Not 100% sure, but I think so.
Apr
5
comment Chosen ciphertext insecurity in an ElGamal variant
look at your "Diffie-Hellman and ElGamal" slides and/or see my answer below.
Feb
22
comment Why do we assume un-security of communication channel on every cryptography system
The point of the trusted certificate is to ensure that you are talking to who you think you're talking to. In other words, the point of this CA is to create an authentication channel to exchange keys. After the keys are exchange, the rest of the communication can occur over the fully unsecured channel.
Feb
13
comment Is signing a hash instead of the full data considered secure?
@PaĆ­loEbermann I've added that to the answer.
Jan
27
comment What is a block cipher?
@Thomas Thanks. That makes more sense.
Jan
26
comment What is a block cipher?
Typically that block gets padded with '0' until it's the correct blocksize.
Jan
26
comment What is a block cipher?
Well the block size and the keysize can be different. The blocksize is always the same for a given algorithm. If you have 512 bits of data and your block size is 256, you will need to break up the data into two chunks for encryptio/decryption.