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Security and Crypto Technologist


Oct
30
comment Encrypting twice with same key gives back plain text
@owlstead looks like yes, thanks !
Oct
30
revised Encrypting twice with same key gives back plain text
added more clarity
Oct
30
comment Encrypting twice with same key gives back plain text
the question is about block-cipher
Oct
30
comment Encrypting twice with same key gives back plain text
@squeamishossifrage the above question is about block ciphers , i thought it was explicit from the question i was pointing it , anyway edited it now to make it more clear
Oct
30
revised Encrypting twice with same key gives back plain text
added 52 characters in body
Oct
30
asked Encrypting twice with same key gives back plain text
Oct
24
answered Recover plaintext from truncated ciphertext using AES for FPE
Oct
24
revised Format Preserving Encryption for 32 or 64 bit plaintext values
deleted 1 character in body
Oct
23
comment Recover plaintext from truncated ciphertext using AES for FPE
Why are you decrypting using AES ? AES_decrypt is never needed ! may be that is the reason you are not able to recover, share the code on pastebin.com or so , its easier that way for us to tell
Oct
23
comment Format Preserving Encryption for 32 or 64 bit plaintext values
Feistel networks with AES as PRF is the popular and well studied approach for Format Preserving
Oct
23
comment Format Preserving Encryption for 32 or 64 bit plaintext values
am curious which PRF should be used ? What would be the impact on security and performance. doing the above.
Oct
23
comment Format Preserving Encryption for 32 or 64 bit plaintext values
@pg1989 Voltage claims patents on BPS mode too , check this link voltage.com/technology/patents-research
Oct
23
comment Format Preserving Encryption for 32 or 64 bit plaintext values
@Tim, To best of our knowledge there aren't any standards apart from NIST's FFX modes which are patented. Yes we did analyze FastPRP, these techniques work on very tiny spaces less than 16 bits , they tend to be expensive for 32 bits and above although we dont have bench marked results
Oct
23
revised Format Preserving Encryption for 32 or 64 bit plaintext values
added 80 characters in body
Oct
23
answered Format Preserving Encryption for 32 or 64 bit plaintext values
Oct
15
answered Output of a Feistel network with all “0” round function
Oct
13
reviewed Approve Non-linearity of a boolean function
Oct
9
comment Is .NET DESCryptoServiceProvider secure in this case?
Would suggest, you spend some more time on various modes. and find out which suits your application
Oct
9
revised Is .NET DESCryptoServiceProvider secure in this case?
added 127 characters in body
Oct
9
answered Is .NET DESCryptoServiceProvider secure in this case?