Need general info about SE phones/Cruiser

[m_dige]

Hi everyone

I love my cruiser and it works great but have a few questions anyway. So here goes:

1. What is CID? What's the difference between CID 29/36 etc.?

2. What exactly is RSA? I know it's a security thing but would like some more info of its nature

3. When for example the RSA has been removed from a K700i to make it unlockable! Is the phones warranty still intact then????

Thanks in advance and sorry for bad english!

Best regards

Martin

[the_laser]

1. CID - customer identity.

2. exactly about RSA

The RSA algorithm was invented in 1978 by Ron Rivest, Adi Shamir, and Leonard Adleman.

Here's the relatively easy to understand math behind RSA public key encryption.

Find P and Q, two large (e.g., 1024-bit) prime numbers.

Choose E such that E is greater than 1, E is less than PQ, and E and (P-1)(Q-1) are relatively prime, which means they have no prime factors in common. E does not have to be prime, but it must be odd. (P-1)(Q-1) can't be prime because it's an even number.

Compute D such that (DE - 1) is evenly divisible by (P-1)(Q-1). Mathematicians write this as DE = 1 (mod (P-1)(Q-1)), and they call D the multiplicative inverse of E. This is easy to do -- simply find an integer X which causes D = (X(P-1)(Q-1) + 1)/E to be an integer, then use that value of D.

The encryption function is C = (T^E) mod PQ, where C is the ciphertext (a positive integer), T is the plaintext (a positive integer), and ^ indicates exponentiation. The message being encrypted, T, must be less than the modulus, PQ.

The decryption function is T = (C^D) mod PQ, where C is the ciphertext (a positive integer), T is the plaintext (a positive integer), and ^ indicates exponentiation.
Your public key is the pair (PQ, E). Your private key is the number D (reveal it to no one). The product PQ is the modulus (often called N in the literature). E is the public exponent. D is the secret exponent.

You can publish your public key freely, because there are no known easy methods of calculating D, P, or Q given only (PQ, E) (your public key). If P and Q are each 1024 bits long, the sun will burn out before the most powerful computers presently in existence can factor your modulus into P and Q.


3. it is just "public" term , cause there is no any RSA in k700 that needs to be removed.

[sevastos]

So what's the difference between CID 29 and 36? Also, what are the differences between red, brown and blue phones?

[Uvedovle]

Originally Posted by the_laser

1. CID - customer identity.

2. exactly about RSA

The RSA algorithm was invented in 1978 by Ron Rivest, Adi Shamir, and Leonard Adleman.

Here's the relatively easy to understand math behind RSA public key encryption.

Find P and Q, two large (e.g., 1024-bit) prime numbers.

Choose E such that E is greater than 1, E is less than PQ, and E and (P-1)(Q-1) are relatively prime, which means they have no prime factors in common. E does not have to be prime, but it must be odd. (P-1)(Q-1) can't be prime because it's an even number.

Compute D such that (DE - 1) is evenly divisible by (P-1)(Q-1). Mathematicians write this as DE = 1 (mod (P-1)(Q-1)), and they call D the multiplicative inverse of E. This is easy to do -- simply find an integer X which causes D = (X(P-1)(Q-1) + 1)/E to be an integer, then use that value of D.

The encryption function is C = (T^E) mod PQ, where C is the ciphertext (a positive integer), T is the plaintext (a positive integer), and ^ indicates exponentiation. The message being encrypted, T, must be less than the modulus, PQ.

The decryption function is T = (C^D) mod PQ, where C is the ciphertext (a positive integer), T is the plaintext (a positive integer), and ^ indicates exponentiation.
Your public key is the pair (PQ, E). Your private key is the number D (reveal it to no one). The product PQ is the modulus (often called N in the literature). E is the public exponent. D is the secret exponent.

You can publish your public key freely, because there are no known easy methods of calculating D, P, or Q given only (PQ, E) (your public key). If P and Q are each 1024 bits long, the sun will burn out before the most powerful computers presently in existence can factor your modulus into P and Q.


3. it is just "public" term , cause there is no any RSA in k700 that needs to be removed.

I should spend many time only writing this.


You good, man.


Wbr

[the_laser]

to load a loader into semc (now nokia too and motorola new too) you need to sign it, so phone recognize it as "valid".

"blue","brown","red" is just different combination of different things inside OTP register of flash chip.

cid16,17,29,24,36 is different RSA keypairs, used for signing loaders/data.

that is nice implementation of security, easy and very strong.

[evan_silbert]

Yes...
Blue = Phone "In Progress, not fully programmed"
Brown = Developer Phone
Red = Production Phone

CID 29 = regular SE
CID 17 = LG
CID 36 = New SE (Vodafone?)

[muppet]

Originally Posted by Uvedovle

I should spend many time only writing this.


You good, man.


Wbr

Except he just copy and pasted it (not that there's anything wrong with that)

An interesting thread though, thanks for the info people.

[m_dige]

@all
Thanks for the answers.

Best regards

Martin

muppet muppet muppet, so funny as usual ,
no life only can correct people and post totally useless s.h.i.t.s.

[muppet]

Originally Posted by the_microe

muppet muppet muppet, so funny as usual ,
no life only can correct people and post totally useless s.h.i.t.s.

And no one provides me more stuff to laugh at on this forum than you

[Megaron]

muppet: totaly agree with you

[SubTen]

@muppet and Megaron: count me in

[Uvedovle]

Originally Posted by the_microe

muppet muppet muppet, so funny as usual ,
no life only can correct people and post totally useless s.h.i.t.s.

I don´t think your post is better than mine.

Please, respect me.





Wbr