encryption and decryption algorithms

[fox#]

my project is GSM based door latch opener. so in the program i have planned to use encrypt and decrypt algorithm to make the system more secure. in the program it randomly supplying a password, then i have to convert that according to the algorithm. to convert that password i need a USER FRIENDLY and SECURE algorithm. please give me some ideas for the algorithm to convert the password. need a reply as soon as possible.

 

[blooz]

Your choice should be based on - memory available ,speed,Device etc ...

Generally for Embedded Systems look table based implementations are preferred ..
I personally prefer AES ...

here is one example AES ...

h**p://edipermadi.wordpress.com/2008/01/21/implementing-aes-using-pic16f84/



Hash Functions are another option.. You can generate Hash value of the password and store it When a user enters a password on such a system, the hash value will be calculated and if the hash value generated from the user's entry matches the hash stored , the user is permitted access.

here is a list of some hash functions

h**p://www.larc.usp.br/~pbarreto/hflounge.html

 

[fox#]

using assymetric key algorythm how can i do it? do i have to program the mobile also? if so how?

 

[wisely77]

u need to build a secure link between your remote device (should be your mobile) and the door lock. try to understand the Transport Layer Security (TLS) or Secure Socket Layer (SSL). here is a good link to start Transport Layer Security - Wikipedia, the free encyclopedia

for cryptography reading, i still recommend the book written by Bruce Schneier Applied Cryptography 2nd edition.

good luck.